Question about 2000 Jeep Grand Cherokee

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Is it better to switch off the AC before turning the engine off and to turn the AC on only after starting the engine?

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Yes it puts less strain on your starter and Battery

Posted on Oct 09, 2010

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1 Answer

How long for the ac fan to start working? Ive noticed that the fan does not work when i turn the ac on, can this cause my car to overheat. I check the temp and coolant liquid both seems fine.


the ac fan starts as soon as the ac is switched on
the fan is provide cooling of the condenser before the radiator to prevent high head pressures in the ac compressor
it is the fan at the front of the car mand does not affect engine temp
there is a radiator fan between the engine and the radiator that will not start until the coolant temperature reaches a set temp at which point the ECM switches that fan on
if that fan is not working when the engine is hot , check for fan, coolant temperature sensor switch , fan relay, fuses or problem ECM

Jan 13, 2016 | AC Cars & Trucks

1 Answer

Does the a/c pulley turn when u turn on engine or when you turn on a/c?


the ac compressor has an electric clutch mounted on it , the outside of it the one the belt touches turns with the fan belt and everything else when ever the engine is running , the inside part the one that drives the shaft of the compressor moves only when it receives the electric signal from the dash switch for ac to run (there are a few other switches in the same pathway that could prevent it from receiving power too ) if your fan belt skids or squeals with engine running turn off your defrost/ac switch if it goes away then your ac compressor is most likely bad , if belt just continues to squeal then your belt and/or tensioner needs replaced

Aug 01, 2015 | Cars & Trucks

1 Answer

I can turn the ac switch to ac and then turn on the blower fan switch and nothing happens what could be the problem


Its better check first if there is a supply voltage, then check the switch, then check the fan.step by step.Thanks...

Aug 21, 2011 | 1999 Mercury Cougar

2 Answers

Ac compressor not starting. added one can of 134R and no help. had a rebuild last year of the engine and has not worked since. Thinking it might be a wire some where.


Check for voltage at the AC clutch with AC on and engine running. If no voltage there, check voltage at AC clutch cycling switch.

Aug 13, 2010 | 1997 Ford Expedition

1 Answer

Fan doesnt kick off and on only when a/c is turned on


The fan is controlled by the ecu, the temperature switch, and the ac relay. If the fan comes on when you turn on the ac, the problem is either in the temperature sensor, usually located on the front of engine near the thermostat housing. You can unplug the switch and use a little jumper wire to bypass the switch. If the fan starts, replace the temperature sensing unit. If not, the ECU is either failing to ground the fan ie. the wire from the fan to the ECU is defective, or the ECU itself is defective. All of this said, you are probably better off to take it to a shop and have them read the codes off of the ECU, which should tell you what the problem is. Most auto parts places like Autozone or Checker will check these codes for you for free.

Jul 28, 2010 | 2002 Chevrolet Prizm

1 Answer

Which pins are shorted on AC pressure switch to get the AC compressor to cycle to fill unit with freon?


You should not have to do anything to charge that AC system, except to start the engine and turn on the AC to maximum, then charge the AC system, when there is enough pressure in the system the low pressure switch will trip the AC compressor on and you can continue to fully charge the AC system.

Jun 06, 2010 | 2003 Suzuki Aerio

1 Answer

1999 gran prix a/c is blowing hot air, but was working last year. Put in freon and still does not cool


first turn the ac off and then start the engine. you may want to lift the hood so you can hear the next step better. turn on the ac and within a couple seconds not more than 5 or so you should hear a click sound. This is the ac clutch engaging. if you don't hear a click you can double check the compressor has engaged by looking to see that the center of the ac compressor is turning with the outer pulley. if it is not most likely you don't have enough refrigerant in the system. i would suggest getting an ac pressure tester they are fairly inexpensive but this will tell you for certain if you have enough refrigerant or not.

Mar 31, 2010 | 1999 Pontiac Grand Prix

2 Answers

Engine overheating when ac is on


Ac fan switch is not comming on start the car and turn the ac on and see if fan comes on, if not it may be a relay sensor or a bad motor. If It comes on then look into the radator to see if there are a lot of bugs in the radiator if there is you can power wash it in reverse from the engine comparment but you would have to protect the engine.

Aug 30, 2009 | 2001 Chrysler Sebring

3 Answers

A/C just quit working. No cold air.


there are few problem with the A/C cooling system better check for A/C unit fuse weather it is blown or in good condition, check for the proper working of A/C condencer unit fan motor assembly for proper working, check for weather their is no lick of gas any where in the entire A/C unit complete system or more problem better consult or take the vehicle to nearest Hyundai authorised workshop or better take it to a well knon or experiencied person who had done this sort of problematic work.

Jul 22, 2009 | 2003 Hyundai Santa Fe

2 Answers

1994 buick regal cooling fan's not working


temperature switch bad goto dealer parts get diagram(they give free)find switch remove plug to switch (turn ignition key to on position)take short piece of wire jump plug wires see if fan starts if not check fan motors for operation if they do switch bad replace you can get better deal at local parts house than dealer on switch try that see if thats whats doing it!!!!Best Of Luck toYou!!!!

Jun 30, 2009 | 1995 Buick Regal

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