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1995 Chevy Tahoe ac heater control not working

Blower motor is working fine all speeds, seems no power to controller, as recirculation is also not working. seems issue somewhere as ac compressor stays on evne after key is turned off and kills battery. Replaced AC relay but the switch for the different selicetions is not working (vent, floor, ac, etc)

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: AIR FLOW STUCK IN DEFORST VENT WILL NOT SWITCH TO FLOOR OR AC VEN

I found a broken vacuum hose on top of the intake which runs the controls

Posted on May 30, 2009

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keemo68
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SOURCE: 2004 Chevrolet Silverado Heater/AC Blower on without Ignition ON

there is no relay for the heater fan it's a 15 amp fuse and is on the accessories circuit. the reostat is responsible for all 3 speeds .with the key off there should be no voltage to the blower motor whether the fans speed fan switch is on or off. the fuse will be located in the fuse paneleither on the drivers left side in the dash or underneath the dash in the fuse block. you have a short in the harness that is under the dash and most likely it's a bad plug on the harness. your going to have to do some searching but that's where the problem short is... please rate

Posted on Oct 04, 2008

  • 124 Answers

SOURCE: heater control 98 chevy s10 blazer

These trucks have a problem where moisture builds up in the heater box then freezes. When this freezes and you change your heater settings it breaks the shaft for the blend door. If this is what happened you should be able to look under the dash above and to the right of the gas pedal and you will see two vaccuum accuators one of them you should be able to wiggle around the linkage if it is broke. To fix this you need to remove the entire dash to get the heater box out which involves discharging the AC and draining the coolant because the heater core and evaporator come out. Please rate.

Posted on Dec 13, 2008

  • 11 Answers

SOURCE: Heater/ac switch speeds 1 and 2 don not work in 99 Silverado

you need a resister found under your air duct by the passenger floor under dash board auto zone sells these for about 25.00 you may as well buy cabin air filters while your at it . 1 of the screws will be a pain to install back into the duct work I left mine out didn,t make a difference . you might have to order it as they are a comman item oh you will need a vacuum to clean up mess from cabin air filters .this is not a hard job .

Posted on Feb 28, 2009

  • 3600 Answers

SOURCE: No power for AC compressor

try removing the plug off the low pressure switch on the accumalator plug a paper clip into the plug and turn ac on if it comes on then your low pressure switch is bad or your low on refigerant.

Posted on May 28, 2009

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2003 Toyota Corolla AC Blower/Fan will not turn on, I replaced the Blower/Fan a few weeks ago,


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There's a 10amp fuse that powers the ac clutch relay and compressor. There are 15amp fuses that power the blower motor and the ac control switch. All of those fuses get power from the key switch. The resistor and fan switch provide the ground circuit for the blower motor.
I would want to know if those fuses are getting power, and if the control panel is working. You should be able to ground the blower motor and make it run on high, and that should not have any effect on if the ac compressor is running or not.
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Sounds like a Controller Issue with the Climate Control. Seeing that you applied power and it worked, then it is not the Motor.

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If it only works on ONE SPEED, then you have a Resister Issue for the Blower

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The high speed relay bypasses the resistor. So you should have power coming from the fuse and thru the high relay. Then the resistor for the other speeds gets power from the heat and ac control module which also controls the blend doors.
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BEST TO LET BMW DEALERSHIP REPLACE HEATER BLOWER IF NOT MISTAKEN YOU HAVE TO DISCHARGE AC SYSTEM TO REMOVE REFRIGERANT LINES TO REMOVE BLOWER MOTOR COVER.THIS IS NOT HOME FIX.BMW CARS NOT EASY TO WORK ON.YOU HAVE TO BE BMW MECHANIC TO WORK ON THEM.

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If your vehicle is equipped with automatic climate control, this should help.

Recirculation Operation
The HVAC control module controls the air intake through the recirculation actuator. The recirculation switch closes the recirculation door in order to circulate the air within the vehicle. The outside air switch opens the recirculation door in order to route outside air into the vehicle. Regardless of the blower motor switch position, recirculation is available only in the panel and bi-level mode switch positions. Including the OFF position. The mode switch must be placed in either the panel or bi-level position before the blower motor switch is placed in the OFF position. In order to reduce windshield fogging, outside air is circulated when the mode switch is in the defrost or defog positions. If the recirculation switch is pressed into the ON position when the mode switch is in an unavailable mode position, then the recirculation switch LED will flash 3 times. If the HVAC control module detects a fault with the recirc door the HVAC control module will try to drive the actuator for a predetermined amount of time, to outside air, which is the defaulted position for the recirculation actuator

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1 Answer

AC compressor works fine, Blower does not. How do you repair?


check the fuse in the fan-fan relay-check voltage at the terminals of the blower if you have the voltage problem is to check the blower motor of the blower speed control

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disconect the negative battery cable from battery for 20 seconds and replace cable back,then try ac let me know if this helps u

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replace the A/C control head... very simple to do. Pop off the dash panel and pull the control head out... unplug the 3 harnesses and there you go.

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