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AC switch only work on high - 2005 GMC Canyon

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The blower motor resistor went bad its located near the blower motor under the pass. side of the dash

Posted on Oct 07, 2009

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On my 2006 ac works good when engine is cool, in stop & go traffic it blows hot air & head pressure gets high in ac, car temp is ok what's wrong


How do you know head pressure is high? Do you have an auxiliary electric cooling fan that is not coming on in this situation? It should be in front of the AC condensing coil. There may be a switch tied to the system that is bad. This switch is sometimes activated by the pressure in the high-pressure line to the condenser coil. If there is not enough freon (134a) the pressure will not be high enough to activate the cooling fan switch. I recently added one can to my system and it made the fan run whereas it did not before adding the freon.

Jul 05, 2015 | AC Cars & Trucks

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I was told by A/C guy I have a short somewhere to the high pressure switch. something is not kicking on the compressor. another mechanic said I need a new computer. what do you think


go with the ac guy
there are systems that prevent the ac compressor working
high pressure switch which cuts the ac clutch if the head pressure goes too high
low pressure switch which cuts power to the ac compressor if there
is no gas in the system
climate control systems which cut power when the ac is not required
fuses to the ac system
get a better explanation or seek advice from other ac mechanics

May 01, 2015 | Cars & Trucks

1 Answer

1994 chevy 1500 ac compresssor stopped working fuse is good


couple of reasons
there is no gas in the system and the low pressure switch has stopped the ac compressor
there is too much gas in the system and the high pressure switch has stopped the compressor
there is a blockage in the tx valve and the high pressure switch has stopped the compressor
The climate control module has failed and stopped the compressor
I am thinking a leak and no gas.

Apr 16, 2015 | AC Cars & Trucks

1 Answer

My Cadillac 08 CTS will not blow cold air the relay checked out but when I jumped the relay the compressor kicked in and it blew cold air when I put the relay back in I had nothing tried a horn relay...


there are 3 switches that control the operation of the ac compressor . There is a high pressure switch that will not allow operation if the head pressure goes too high ( excessive gas-blocked system-tx valve condenser fan not working )There is a low pressure switch that stops the compressor when the gas has leaked out and is insufficient A thermostat that will not register and so will not switch on the compressor and finally ac compressors will not work unless both the ac switch and the blower are switched on. Have the system checked out by an accredited ac specialists.;l

May 02, 2014 | Cars & Trucks

1 Answer

96 geo tracker dash a/c switch wont work


Did you check the relay to see if it is getting power and ground ?
Is the high pressure switch working correctly ?
The low pressure switch opens when the pressure drops below 20psi, and the high switch opens when the pressure is above 300psi.

Jan 10, 2013 | 1996 Geo Tracker 2 Door

1 Answer

Location of ac high pressure cutout switch on a 97 Plymouth voyager. Could it be a different problem? Had to replaced the PCM and a couple sensors because of a short in the wiring cluster. Now the ac...


HIGH PRESSURE CUTOFF SWITCH LOCATED ON AC COMPRESSOR DISCHARGE LINE LEADING TO THE CONDENSOR.THE HIGH PRESSURE CUTOFF SWITCH WILL CUT OFF THE AC COMPRESSOR IF SYSTEM PRESSURE RISES TO HIGH CAUSED BY RESTRICTION IN THE REFRIGERANT CIRCUIT OR OVERHEATED CONDENSOR.MAKE SURE COOLING FAN IS RUNNING WHEN THE AC SWITCH IS ON.THE COOLING FAN KEEP CONDENSOR COOL, IF COOLING FAN DONT RUN.YOUR AC WILL STOP BLOWING COLD AIR.HAVE THE REFRIGERANT SYSTEM CHECK OUT.MAKE SURE YOUR LOW SIDE PRESSURE IS 10 - 37 PSI. THE HIGH SIDE PRESSURE SHOULD BE 112 - 210 PSI. CHECK THE AC COMPRESSOR CLUTCH FUSE AND RELAY.

Jul 29, 2011 | Plymouth Voyager Cars & Trucks

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Fan only works high speed. For AC compressor runs but no fan other than when switched to high speed at which time the fan runs at high speed but AC switches off.


I have the same problem on my 1999 Jetta have you gotten any responces yet if you do please email me the solution rohintz@gmail.com Thank you Rick

Jun 13, 2011 | 1999 Volkswagen Jetta

1 Answer

RPM Is Very High On AC Load


check the solenoid that control the engine RPM the solenoid will work if the compressor run, this will increase your rpm when AC on. location near the carburetor.

Jun 11, 2009 | Oldsmobile 88 Cars & Trucks

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