Question about GMC K1500

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I have a 1994 k1500 I had the ac system replace all new parts my self hoses everything. I had it charged by a shop and now the compressor wont kick on there is no voltage going to the plug I can get it to kick on if I put power to it I check all the relays that are listed and fusable links I so stumped.

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CHECK FUSE ALSO.SCAN IT AND CHECK TO SEE IF AIR CONDITIONER PRESSURE SENSOR.PROBLEM.THAT WILL CAUSE COMPRESSOR NOT TO COME ON.

Posted on Jul 28, 2009

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COMPRESSER KICKS ON (blows cold)only ON LOW IF YOU TURN BLOWER ON ANTHING BUT 1 the ac light goes out and compressor kicks off, changed the climate control thing and that didn't fix it!!


that sounds like normal operation to me. might be low on charge therefore won't kick in on high speed due to not damaging the system and running the ac compressor to cause damage. have the system checked at a local shop. if ok, then recheck that everything is plugged in. all sensor on the ac lines. sounds like it might even be the low side cut off switch or plugged orfice tube or something along those lines...best left to a professional with a machine where they can monitor pressures, and proper operation and see what's going on.

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Replaced compressor on 2007 Kia Sereno and compressor wont kick on. What's the problem? Please help.


ac compressors are controlled by relays , switches , high and low pressure switches and fuses
replacing the ac compressor will require the gas charge to be administered as too little or too much will affect the high/low pressure switches
have it inspected by an accredited ac specialist shop for a proper diagnosis and a quote

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Compression hose on my 1993 chevy blazer k1500 is leaking how do i replace it and what tools do i need


AC compressor hose? If yes, confirm system is empty before disconnecting from the compressor and the next piece(dryer/expansion valve/etc). When installing new hose(s) , replace associated o-rings and the dryer too. Pull vacuum after everything is buttoned up. Then add few ounces of pag oil and they factory oz's of 134a.

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Air conditioner suddenly not working.. No funny noise, just acts like it is not getting power. compressor kicks on and off checked relays behind glove compartment. Was told ac relay may not located with...


AC COMPRESSOR KICKING OFF AND ON.SOUND LIKE REFRIGERANT LOW.LOW SIDE SHOULD BE 20 - 36 PSI AND HIGH SIDE SHOULD BE 215 - 310 PSI. AC SYSTEM COULD HAVE A LEAK WHILE YOUR COOLING STOPPED. DRIVER SIDE WINDOW MOST TIME SWITCH WILL BE THE PROBLEM.REMOVE SWITCH SEE IF POWER GOING TO POWER WINDOW MOTOR.YOU HEAR WINDOW MOTOR TRYING TO WORK WHILE USING SWITCH.WINDOW REGULATOR COULD BE BINDING DAMAGED OR NEED LUBRICATING.OR MOTOR NEED REPLACED.IF POWER NOT GOING TO POWER WINDOW MOTOR THE CONTROL SWITCH IS BAD IF ITS THE ONLY SWITCH.TO TELL IF WINDOW SWITCH IS BAD SHAKE POWER WINDOW SWITCH WIRES WHILE OPERATING CONTROL SWITCH.IF POWER WINDOW WORKS YOU KNOW SWITCH IS BAD.TAKE CAR TO AC SHOP BECAUSE LET THEM CHECK AC SYSTEM BECAUSE IF YOU BUY 2 CANS OF R134 REFRIGERANT. AND YOU TRY CHARGING AC SYSTEM YOUR SELF AND ALL REFRIGERANT LEAKS OUT. YOU GOING TO BE OUT OF $30.00 STILL NO AC.THAT WHY ITS BEST TO LET SHOP PUMP DOWN AC SYSTEM CHECK FOR LEAKS BEFORE RECHARGING AC SYSTEM.

Jun 26, 2011 | 2000 Acura TL

1 Answer

Air compressor does'nt kick in


you may have a leak in your ac system. its possible that the previous owner charged the ac to help sell the car. most newer cars have a sort of safety switch to protect the compressor from damage. if the ac pressure is too low, the compressor wont turn on. have a shop do a quick check of the pressure. it only takes a minute or so. if it is low, then thats definitely your problem. you will need to have the leak fixed and the ac recharged for it to work properly.

Sep 04, 2009 | 1997 Chevrolet Malibu

1 Answer

My air con does not deliver cold air. I had it diagnosed by an air con specialist who said the compressor had an open circuit fault and needed to be replaced. My local garage replaced the compressor at the...


to hear things like this really bugs me why would any mechanic replace a parts not knowing that is the problem and call them self a mechanic. Going to give you the best run down as I can think of, and at least we know now you have a new compressor and we can leave that out as the problem.
1 check for leaks, If no pressure your compressor will not run. a dye can be added when charged the
system to see any leaks may exist by using black light.
2 check pressure switch & pressostat making sure is not faulty, if it faulty, the switch will not sense
any pressure to kick the compressor on.
3. check AC fuse, making sure is not blown, if blown no power to ac switch
4. check AC relay, making sure is good relay, bad relay compressor will not work or kick on.
5. Make sure your have no moisture or air in the system, system will not operate up to 100% if any
of those items exist in the system, best way to charged the system is to vacum the system out
first removing any moister and air in the systems, keep in mind, air is 02 can convert into
moister/water molecules if its cold enough.
6. expansion valve faulty, this unit usually goes out like compressor do. it sense the temperature,
regulate refrigerant flow to evaporator. everything may run and operate correctly, if this unit goes
bad it will restrict refrigerant flow cycle and evaporator will not get cold.
I would replace number 6, eventhough if its not bad, it need to be place regardless because of the year of your vechicle, cost 5 bucks. Note: My guess, when you push the ac button do you hear the compressor kick on, if not my guess would be 1 and 2. replace.. If your compressor is running than it would be no. 6 and make sure you have lots of feon in the systems. good luck, hope that help some.

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1 Answer

Clutch short cycles and air comes on a off.


From what you're describing, it sounds like the AC system needs a refrigerant charge.
Many car owners are doing their own AC
charge by purchasing a re-charge kit at the local auto parts store. A small gauge is also available (looks like a tire gauge) that attaches to the low side of the AC system, that gives you a reading of the system's charge.
The low side of the system is the larger metal hose line coming from the compressor. It has a fitting and cap on it. The high side is the smaller diameter metal hose.

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1 Answer

91 chevy 1500 ac light flashing


try disconnecting the negative battery cable for ten minutes to reset the computer.

good luck

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1 Answer

My 1994 honda civic wont turn on my a/c compresor. when i switch on the a/c the idle jumps up the down then up then down. anyone know what happening


This is being caused by a low charge in the AC system, the idle is due to the rapid kicking on and off of the AC compressor on the engine, each time the compressor comes on the computer raises the idle and then drops it when the compressor turns off. U have no cooling right? U have a leak in the AC, have the leak fixed and then get the system re-charged.

May 11, 2009 | 1994 Honda Civic

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