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You have the right to test your HEATER using the test in the following link:http://www.usmam.org/forum/f299/diy-heater-output-temperature-test-508851/#post8032883A temperature check of the air Conditioning part of the HVAC (Heating, Ventilation, and also Air Conditioner) system will:Ø offer a basic indication of whether anything is wrong, before you might otherwise an alert a problem, andØ provide a baseline worth for future comparison and also reference.The temperature check procedure listed below takes less than 5 minutes, and requires only an exact thermometer. The check procedure is native the GM factory organization manual (FSM), is simple, and also gives accurate and also repeatable results.It will take you much much longer to read this post, 보다 to execute the check procedure. However unless girlfriend read completely through this post, and understand it, her test procedure results will not be valid.This procedure is certain to the S10 Blazer, however should work-related for most any type of Chevy (or similar GM) auto manufactured since around 1996. Do note that while the test procedure itself may work for non-GM vehicles, the outcomes will likely differ. For example, this check procedure is usually the exact same as the one for my 2009 Acura RDX. But the expected results are fully different (completely different temperature output graph). The is due to the fact that the Acura car engine, and every one of the A/C parts are fully different from the Chevy parts. Back my personal opinion is that the Acura A/C parts are no as an excellent as the Chevy parts.WHAT’S spanned in this POST?Ø WHY article THIS test PROCEDURE?Ø WHY do the standard TEMPERATURE-CHECK of the A/C (AIR CONDITIONER)?Ø WHAT space THE after-effects IF THE A/C COMPRESSOR FAILS?Ø A WORD about A/C FREON push READINGS:Ø THE GM CHEVY typical PERFORMANCE TEMPERATURE TEST because that the A/C (AIR CONDITIONER) part of the HVAC system:Ø MY very own TEST RESULTS:Ø how TO check out THE GM A/C TEMPERATURE GRAPH:The check procedure in this write-up is indigenous the FSM (factory business manual) because that a 1998 Chevy Blazer S-10. But the A/C parts are usually the same for all GM trucks and also cars since about 1996: the compressor, condenser, evaporator, sensors, HVAC controls, etc. Therefore this temperature test have to be valid and produce comparable results, for most any kind of GM automobile since approximately 1996 and also later.WHY post THIS test PROCEDURE?Because I might not find any kind of meaningful test procedure online. Ns did a nice thorough search online, for just how to inspect an A/C system. Ns did not uncover anything an ext than the basic “output air must be 40 degrees less than the intake temperature”, which girlfriend will view from the test procedure below is fully worthless. The relative humidity level need to be considered.There are likewise online, general procedures because that checking A/C Freon pressures. The pressure specs listed are likewise worthless, because the forced pressure values are details to the vehicle specifications, as well as the test problems (ambient waiting temperature and also humidity). And an exact test calls for some fairly expensive tools which many of us execute not own. The press specifications provided below incorporate the required respective humidity levels.If girlfriend do determine from this test the there is a problem, the adhering to links are good for basic trouble-shooting.LINK: Heating, Ventilation & Air air conditioning (HVAC) usual problems and also trouble-shooting.http://www.usmam.org/forum/f299/heating-ventilation-and-air-conditioning-hvac-common-problems-and-troubleshooting-499579/LINK: A/C HOW-TO, very good thread general threadhttp://www.s10planet.com/forum/showthread.php?t=24977WHY execute the standard TEMPERATURE-CHECK that the A/C (AIR CONDITIONER)?By the time you an alert that the A/C mechanism is not performing together it as soon as did, you currently have a serious problem. A butt-check for A/C cooling is simply not precise enough. The traditional temperature procedure check is a much much more severe load inspect of the A/C device than your normal driving. You space using your A/C mechanism while driving, no stopped, windows closed, and likely in HVAC re-circulate mode. The conventional test is excellent while the automobile is parked and also engine idling, v the doors open.The test have the right to give very early indication that a slow-moving Freon leak, by reporting a higher-than-specified A/C temperature output. If the Freon-level and pressure drops too low, the A/C compressor deserve to be damaged prior to the low-pressure shut-off switch closes.However, the A/C device might additionally be overcharged, i beg your pardon will likewise cause a too high temperature output. I know, the does no sound correct, however it is. In one of two people case, girlfriend will need to examine the pressure readings yourself, or have actually them confirm by a standard tech, the is, someone that actually knows around A/C systems. And not every mechanic is qualified to check your HVAC system.WHAT are THE aftermath IF THE A/C COMPRESSOR FAILS?And if the compressor actually falls short (mechanically) due to the fact that the Freon leaks out, and it destroys chin internally because there is no oil (no Freon no oil), it will have dispersed metal and other swarf transparent the whole AC system. Carry out a internet search because that ‘Accord black color Death’, or ‘Chevy black Death’, or ‘Ford black Death’, etc.The difficulty is not with GM or any specific brand the compressor, the trouble is with current rotary type compressors, quite than the old layout pump compressors. The old format compressors to be much much less likely to destroy the rest of the AC device when they failed (evaporator, condenser, lines, etc.). Yet they were twice the size and weight. And also we understand it is all about weight (and CAFÉ gas usage ratings).If the compressor self-destructs, and also distributes steel throughout the lines and also condenser, etc., you can expect a required, complete system replacement at a cost of $2K or more. Yes, a liquid do the washing up of the A/C materials can be done. However most shops will not offer you a warranty uneven the components are in reality replaced, not just flushed.A WORD around A/C FREON push READINGS:If the A/C output temperature is no within the GM specification, climate there are several other specific things to it is in checked, but they space not all extended here. The GM push specifications are given here, for those who are interested, and also for those who do have the compelled test devices (and know how to usage it). This post does no cover how to take it or translate pressure readings – they are merely provided as recommendation information.All pressure readings should be taken v engine at 1,500 rpm, and also during the TEMPERATURE check procedure as defined below. Below are the stated Freon push readings indigenous the FSM procedure because that the 1998 Chevy BLAZER S-10. The specified pressures room the MAXIMUM permitted low-side and also high-side pressures. Acceptable MINIMUM pressure values are not offered in the FSM.HUMIDITY .. AIR TEMP .. MAX LOW . MAX HIGH PRESSURE40% ....... 80°F ...... 32psi ... 228psi40% ....... 90°F ...... 39psi ... 280psi40% ...... 100°F ...... 44psi ... 301psi40% ...... 110°F ...... 46psi ... 327psi50% ....... 70°F ...... 28psi ... 160psi70% ....... 70°F ...... 34psi ... 228psi70% ....... 90°F ...... 47psi ... 291psi80% ....... 80°F ...... 39psi ... 251psiTHE GM CHEVY typical PERFORMANCE TEMPERATURE TEST for the A/C (AIR CONDITIONER) component of the HVAC system:The check itself takes much less than 5 minutes and also requires only an accurate temperature gauge. When the test is simple, that is different than simply measuring the A/C output temperature when driving around, or when parked.Since most civilization do no seem to have actually the FSM (factory business manual), here is the FSM test through a few notes. The adhering to table mirrors the stated MAXIMUM center Air Outlet Temperatures, in ~ the specified family member Humidity Percentages, at 1500 rpm engine speed:HUMIDITY .. AIR TEMP .. OUTPUT TEMP40% ....... 80°F ...... 51°F40% ....... 90°F ...... 59°F40% ...... 100°F ...... 66°F40% ...... 110°F ...... 75°F40% ...... 120°F ...... 63°F (note 1)50% ....... 70°F ...... 43°F (note 2)70% ....... 70°F ...... 54°F70% ....... 90°F ...... 65°F80% ....... 80°F ...... 58°FNOTE 1: measure up these worths in MAX A/C with all of the doors and also windows closed.NOTE 2: the compressor cycles ON and also OFF.Read the check CONDITIONS, and then monitor the HVAC manage SETTINGS and also PROCEDURE direction below. I have not noticed any significant difference in the results, between performing this test with the engine cold or hot, so long as the engine is not already near its preferably temperature or about to overheat due to the fact that you have been driving is rush-hour web traffic for an hour.However, that is ideal to begin with a cold engine, or at least one that has been sitting for a hour or so. The will create the most regular readings. If you begin with a warm engine, the engine will certainly hit preferably coolant temperature and also the fan clutch (if equipped) will engage. The can influence your A/C temperature readings.TEST SETUP CONDITIONS:Ø Avoid straight sunlight (park in the shade, yet not inside a tiny garage). Patience (no wind) problems are best. I park behind my very own garage in the afternoon, outside, in the shade. Or within my twin car garage v the large single entry-door open, as well as the former “people” door.Ø Vent the engine exhaust if necessary.Ø open the hood, hook up push gauges if you are taking press readings. Path the push hoses throughout the behind hood seal. Ice cream the gauges come the windshield so that you have the right to see them. Climate close the hood come the LATCH position.Ø open (fully) both prior doors v windows up, OR, prior doors closed through windows down.Ø document the ambient temperature in ~ the vehicle. It is ideal to usage a separate thermometer, and leave it exterior the passenger door, numerous feet from (but no over) the hood. If within a garage, cave it from the ceiling, alongside the vehicle. If outside, just take this measurement prior to beginning the test procedure, and also another analysis after the test procedure, for verification.Ø You want to measure the general A/C input temperature, by measure the ambient temperature. But you execute not want your analysis to be affected by the engine temp (radiating native the height of the hood). This is particularly important if the auto is parked inside. Girlfriend will find that the approximately temperature will be boosted from the engine radiating heat, indigenous the start to the end of the test. A different thermometer exterior the auto will allow you know if this occurs. Thus the most regular A/C calculation readings will certainly be taken if the vehicle is parked external (unless you are parked within a very large building).Ø record the loved one humidity. Use a psychrometer or above the local weather bureau.HVAC manage SELECTIONS:The 1998 S-10 Blazer has either traditional or optional digital climate manage system HVAC controls. The HVAC controls different for other 1998 GM models. In fact, every model and year has actually slightly various HVAC control knobs and also control-names.Therefore, collection the HVAC controls based upon function, no by the control knob names. And also there is no allude in asking me how to set the controls in your own vehicle, since I carry out not know. If you will review the adhering to carefully, and collection your own HVAC controls by function, quite than by control-knob name, you should have actually no problem.Note the for electronically controlled HVAC systems, that part control-settings must be selected after the engine is started. And also ensure that the settings remain as you have selected them, throughout the entire time that the test PROCEDURE.Ø traditional MODE control knob: set to MAX A/C. If your auto has this manage knob-setting, climate it probably does not have actually separate controls for exterior AIR, RECIRCULATION, or A/C ON-OFF. V MAX A/C selected, the device will automatically function in RECIRCULATION mode and also most wait will flow through the instrument panel VENTS. Inspect your Owner’s Manual.Ø digital MODE manage knob: perform *not* set to AUTO. In AUTO setting some other attributes are instantly controlled. That means that you will certainly not understand their yes, really settings, so choose the actual function settings yourself, together below, once possible.Ø VENTS: select the setting which allows air to departure only from the instrument panel (dash) vents, if possible. Completely open both the CENTER and SIDE vents and also direct air-flow directly ahead.Ø A/C control: collection to ON.Ø TEMPERATURE CONTROL: collection to the lowest setting (full COLD).Ø external AIR: set to OFF.Ø RECIRCULATION: set to ON.Ø BLOWER SPEED: collection to hello or preferably speed.ACTUAL check PROCEDURE indigenous the FSM:1) location the infection in PARK or NEUTRAL (for a hands-on transmission). Set the emergency brake.2) Insert your recording temperature gauge into the center vent by the driver position.3) start the engine.4) Stabilize the engine speed at 1,500rpm. Simply sit in the driver’s seat, and use your foot on the accelerator. OR, place a dime under the throttle stop screw – UNDER NO CIRCUMSTANCES transform THE SCREW POSITION, its purpose is not idle control.5) start a timer (or usage your dash clock).6) run the air conditioning mechanism until the vent outlet wait reaches the shortest temperature (about 3 minutes).7) document your temperature gauge reading. Likewise record the Freon press readings if you space taking those.8) rotate off the engine.9) to compare the A/C calculation temperature (and optional pressure readings) versus the FSM meant readings, as displayed in the tables above. Regular operating air conditioning systems have to not exceed common levels.10) inspect the external surfaces of the radiator and also the condenser cores. Inspect between the condenser and the radiator and the outer surfaces. Ensure that the airflow is no blocked by the adhering to materials:DIRTLEAVESOTHER foreign MATTER11) examine the following components for restrictions (bent cooling vanes) or (hose) kinks:THE EVAPORATOR CORETHE CONDENSER CORETHE HOSESTHE TUBES12) examine for refrigerant leaks (see sections listed below for details).13) Inspect all of the air ducts for leaks or restrictions. Short air circulation may indicate a restricted evaporator core.14) examine the compressor clutch for slippage.15) check the drive belt for improper tension.DONE. Close the doors and hood.MY own TEST RESULTS:The graph listed below shows the mentioned maximum test results from the FSM as RED dots. And also the measure up test results for my own S-10 together BLUE (teal colored) dots.Although i preformed this test procedure at various temperatures, over there is a straightforward constraint because of where I live. In August, the normal temperature varies in between 65 and 105 degrees. Hot in the afternoon, and coolest at about 6am (sunup). That seldom/ never rains and thus the corresponding relative humidity is 10-20% in the afternoon, and 40-50% in the early morning.So over there is (almost) never ever a time when it is 90 degrees and much more than 20% humidity. And never a time when it is 40% humidity, and much more than 70 degrees. Whereby I live, those test conditions simply perform not exist in August. And also they normally do no exist at any type of other time either.Therefore, i cannot tell friend just exactly how accurate is the GM graph presented here, due to the fact that I cannot validate the FSM mentioned data with my very own tests. I can only existing the data native the FSM, and also my very own test data, and then you will need to perform your own tests. All the I can really say, is the this is how GM expects an A/C device to perform.In reviewing the FSM based graphs at the finish of this post below, keep in mind the following:Ø note that several of my A/C temperature readings it seems ~ inconsistent, based upon the humidity readings. The nearest weather station to wherein I live is around 20 mile away. That means that the humidity whereby I live is not constantly exactly the very same as in ~ the weather station. Yet I have included every one of my test outcomes anyway, so that you have the right to have more information as a reference.Ø The FSM test procedure is supposed to load the A/C device heavily enough to give valid results. Note that this works only at a humidity over 40%. At an extremely low humidity and low entry temperatures, the compressor is cycling instead of constantly running.Ø The areas of the graph at the edges (top, bottom, and also sides) are external of the specified data given in the FSM, so any test results that you acquire that graph come those areas should be considered with some reservation. In other words, it will be an overwhelming to identify from together test results if over there is (or is not) a trouble with your A/C system. Any kind of readings come the left and below the RED damaged line are especially untrustworthy.Ø together an extension of the previous point, you cannot extrapolate any data external of the area ~ above the graph. In particular, any kind of data taken above 110 levels will no be valid. For this reason if girlfriend live in Phoenix and also you shot to operation a test at 120 degrees, good luck. I have no idea what an outcome you have to expect.Ø The test procedure is defined in together a method as to minimize the effect of the HVAC controls, such as the actual manage buttons and switches, positioning motors, air flow doors, sensors, etc. Obviously, over there is tho some impact from these items. Therefore, if your test outcomes are not within the specified borders of the FSM data, over there are various other possibilities than that the A/C compressor is operating outside its identified parameters. In various other words, if the wait is not as cool as it need to be, there are other (problem) reasons besides the A/C compressor, that you will must investigate.Ø Finally, think carefully and try to analysis the case if the VENT (output) temperature is higher than the specification native the graph. For example, if your test (INPUT) temperature is low (below 75) and the humidity is high, the is feasible that the evaporator is frozen. And while there room some various other things that have the right to be checked, let united state leave the here, together the main purpose that this short article is to simply temperature check the A/C.HOW TO review THE GM A/C TEMPERATURE GRAPH:The graph below is my very own creation, based on the information noted in a table in the 1998 Chevy S-10 FSM. The RED dots are the specified and defined data native the FSM table. The BLUE dots are data recorded from tests on my very own A/C system.The heavy (wide) black color humidity lines room drawn in between actual mentioned FSM data. The various other thin black lines and the broken blue lines, space estimated. Yes, that way they are guesses. Please keep that in mind as soon as placing your very own recorded data, for your own HVAC system, onto the graph.NOTE: the GM temperature graph is not valid for temperatures over 110 levels Fahrenheit. The pack on the compressor in ~ elevated temperatures is much more than deserve to be presented by straight (straight) currently on this graph.

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NOTE: the GM temperature graph is not valid for temperatures below 75 degrees and also humidity below around 50%, due to the fact that the A/C compressor will certainly be to ride bicycle on-and-off. The is mostly the area to the left of and also below the broken red line. The lower the humidity, the much less load ~ above the compressor, and the easier it is for the system to cool the air. Yes, there room humidity lines on the graph for these conditions, yet those lines room estimates. The actual test results will no be linear (straight lines) for the conditions just defined. That is why the FSM 50% humidity specified RED dot is on the exact same ‘projected’ line because that 40% humidity, and also is no on the ‘projected’ line because that 50% humidity.