Question about 2007 GMC Envoy Denali

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When turning my AC or Heat full power, it shuts down as if it's not even on. It works normally on all other intermediate levels (1-4) however when put on level 5, it shuts off. It doesn't matter if it's AC or heat. Any ideas?

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This sounds like the blower resistor is bad, the resistor is located near blower motor going into heaterbox, just remove the connector and then the 2 screws that hold it to box and then slide it out and install new one,

Posted on Jul 15, 2010

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Air conditioner will not turn on 1994 geo metro


ok , this is easy (dead even at first start?)
we can do this step by step if you want
  1. Does blower blow? (heater fan) no, then fix that first.
  2. Does the A/C button light glow, it must.
  3. Does the compressor spin, A.C on.?
  4. yes, then the freon loop has issues, get help there.
  5. no, bet its this, huh? and is caused by the A./C amp logic module detecting errrors, we check the pins on that model with any volt meter to find true cause. One cause is too much freon.
  6. Engine over heat sensor for A.C bad or wires there grounding out.
  7. Engine overload. ECU can tell A>C to cut out for 2 reasons.
  8. EVAP core freezes up (ice) works at start the fails later?
  9. is the AC accelerator switch closed, if stuck closed there will not be any AC compressor action. (a throttle pedal switch)
  10. Is the yellow wire at Hi/low Freon switch at 12v, if not there will be no A/C due to AC compressor relay dropping out.
  11. if the pink wire on the AC comp relay is 12v then the AMP is not happy, its logic is defeating the AC. to find cause look at the AMP.
  12. AMP pin 12 yel/blk must be 0v or overheated , or this sensor is bad or the wire fell off it. easy huh ,with a voltmeter>?
  13. AMP pin 11, blu/blk. 12volts or AMP shuts you down.
  14. AMP pin 5 has must be 12v, not 0v, and is 2 sensors. the wire color there is green-red. the transaxle cut switch or the throttle cut switch must not be closed and forcing this pin to 0v. yes, use any voltmeter on this pin. unplug each sensor 1 by one to find who is wrong (closed)
  15. Amp Pin 1, blue-red, is power 12vdc power, if not 12v the amp shuts down. (no power no joy)
this is mostly it. i have the schematic, (ask for it)
or read it all online at alldata.com, like me.

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1 Answer

NO HEAT OR A/C FROM BLOWER MOTOR.


You can have your mechanic friend test the motor under the hood where the wires plug into the blower. It sounds like the motor has went bad in my opinion, but it could be the plug is loose. I will be hoping its just loose for your sake and good luck!

Nov 04, 2012 | Cars & Trucks

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1998 Toyota Corolla radiator heats up (gauge goes full) every time I turn on the AC Fan for 5 to 10 minutes. This is happening with or without AC on. This model has Fan seperate from AC which gets turned...


Most overheating problems are caused by a stuck closed thermostat, if it has already been replaced the next common cause is a clogged radiator, have it checked at a REAPIR SHOP OR RADIATOR SHOP IF YOU REMOVE IT YOURSELF

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It has been about three days now its cold here and the heat in my truck will not turn on until the overheat gauge is above where it normally is 3/4 maxed out it is normally on 1/2 way point. than it...


This is a common problem as the weather get cold. Don't know the year of your vehicle, but if it is a 2005 or earlier I would be looking at replacement of the thermostat. Also, check to see if your coolant level is OK. Do this first and only when the engine is cold and not running.

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V6 2008 1/2 ton PU 2wd "Engine temp high/AC turned off " display. Temp guage shows 160 deg , fans running constantly , heat from vents normal. Coolant expansion tank full , oil level full...


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Nov 24, 2010 | 2008 Chevrolet Silverado 2500HD 2WD

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Air/heat blower is not working unless it is on high.


The heater resistor is probably faulty, its located near the blower fan

May 23, 2010 | 2000 Toyota Camry

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My 2006 impala when it runs less that 5 min the temp gauge goes tohalf way ... and the heater blows cold while idle even after true warm up time... what is wrong


check the water level in the radiator to see if it is full, if not fill it, if it is still not function move the heat ac controller does if feel normal? if it does then you have a heater control vale not working. let me know if you need more help.

Mar 27, 2010 | 2006 Chevrolet Impala

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2005 RX8 heater is blowing cold air. Fluids are topped up.


You need to repair the heater core with a soldering gun.

If you do not have heat, or only have heat, IMHO it is most likey the AC/heater control unit. This is the part which has the AC/heat control buttons and knobs.

Easy Diagnosis:
The easiest way to verify this is to turn on the radio, press and hold the power on/off button and press and hold the scan-up button for a second (full second). The word "A/C TEMP" should appear on the left of the display and a number from 0 to 16 on the right. I suspect yours will have the number 0 (or 16 if heating only problem) displayed no matter where you turn the temperature control knob. If this is the case you could turn the temp. knob to full heat and see if it goes to 16 after pushing down or to the right on the knob.
In a working system, the number moves evenly in increments of 1, from 0 to 16 as you turn the temperature knob.

Easy Fix:
I was able to take mine out and solder 3 loose connections to fix it.

The beginning steps are the same as for any radio removal procedure and check for loose connections.

Dec 14, 2009 | 2005 Mazda RX-8

1 Answer

Engine gets very hot; air conditioning shuts off


It needs to be diagnosed. It's normal for the AC to shut down when the engine overheats. The engine computer (called the ECU - Engine Control Unit) monitors the coolant temperature by means of a coolant temperature sensor (cts). When this sensor tells the computer the engine is too hot (above 230 to 240 degrees), the ECU turns off the AC compressor and the cooling system fans go to MAXIMUM (HIGH) speed. By the way, there are two engine/coolant temp sensors - one for the instrument gauges, the other for the ECU. If this sensor is malfunctioning, it can cause the symptom you describe - BUT that needs to be verified. Best solution, take it back into the mechanics/technicians and have them determine if that's all this is, because if it isn't, something else could be seriously wrong (clogged radiator, malfunctioning water pump, bad thermostat (even though it's new (or maybe it didn't actually get replaced), and there's a slew of other possible causes.. leaking head gasket for one. Best have the professionals (if they are professional) diagnose it.

May 25, 2009 | 2000 Hyundai Sonata

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