Question about 2003 Chrysler PT Cruiser

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AC will not on engine fan

AC compressor has exstreamly high head pressure will not turn on engine fan, compressor keeps shuting off due to high pressure.

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Fan relay bad...fan motor assembly bad or bad ac pressure switch

Posted on Oct 15, 2008

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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

Truck has recently begun to go straight into limp home mode immediately after starting. the cooling fan starts in high speed with no A/C running.


Make sure ac compressor clutch is not engaged even though ac switch is off. If clutch is turning compressor on due to stuck relay etc, ecm will turn on fan due to signal from pressure switch. You may need a scan tool to view scan data and determine source of fan issue

Jun 29, 2015 | Cars & Trucks

1 Answer

My 010 3.2 diesel air con recycle every 6/8 seconds what may be problem


probably due to high head pressures in the ac compressor from the condenser fan not working to cool the gas that is under pressure.
Take it to an accredited ac specialist shop

Jan 12, 2015 | Mitsubishi Pajero Cars & Trucks

1 Answer

Ac compressor doesn't turn on


make sure that the fan is on as well as the ac switch. There are other switches that turn the compressor clutch off when something goes wrong. There is a high head pressure switch that turns off if there is excessive pressure generated from blockage or excess gas and another switch that closes of when there is insufficient gas in the system. Have a ac mechanic check the system for leaks as that is the most common problem.

Jul 23, 2013 | 2001 Pontiac Grand Am SE

1 Answer

Compressor and fans do not turn on until rev engine


I passed this question the first time I read it, so I will take a stab at it now.
The fans don't come on until the compressor has pumped the freon pressure up to say 150 or 200 psi. And the compressor clutch has to have voltage to engage the clutch.
I wonder if the clutch is going and needs 14 volts instead of 12 to engage ? Or the relay that powers the clutch ?
Speeding up the engine would increase voltage from the alternator.
This is assuming the serpentine belt is tight and everything else is working correctly.
I think I would swap the relay with another and put a meter on that circuit to the ac clutch to see what it takes to engage it.

Jul 24, 2012 | 1992 Buick Regal

1 Answer

2003 Hyundai Sante fe A/C fan and rad fan not turning Fast enough while A/C is on but work OK when engine come to temp. ac starts off cold then gets warm after about 5 miles.


make sure radiator and or condensor fins are not restricted with dirt , bugs etc. poor airflow across the condensor. high side pressure could rise too high causing compressor to cycle off and on and not cool the freon properly.not sure what you mean when you say you play with the relay and it comes on. compressor or the fan? pull the relay and look at the female pins and make sure they are not spread open too wide. is the check engine lamp on? sometimes computers will disable ac for some other faults. im not sure if you mean the compressor is turning off and staying off, or just not cooling well due to fan problem. if its turning off it could be a control head problem or the pcm disabling it for another reason. or if you are manipulating the relay then compressor kicks on you may have a bad relay. hope this helps

Jul 14, 2012 | 2003 Hyundai Santa Fe

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

1 Answer

On third compressor. Had the temperature sensor


With the AC on, the fan will come on to help the ac codensor. Why your compressor keeps crapping out is definately something to look into. If your AC is overcharged the head pressures can get pretty high and if the oil is low, that would not help either.. Good Luck.

Aug 03, 2009 | 2006 Chevrolet Equinox

1 Answer

Air conditioning comp not turn on


if you used a pressure washer ,you could have caused a leak ,if there is no freon the low pressure switch wont let the compressor turn on,even if you didnt use high pressure,engine degreaser may remove corrosion on the line set or the condenser ,also causing a leak, the high or low pressure switches may still be wet, follow the line set ,fat line (low pressure switch with a plug w/2 wires)unplug it make sure its not still wet inside,do the same to the high pressure switch on the small line,check the fuses ,pull the ac relay make sure there is no water underneath,and the prongs are dry,if the blower fan in the vechile isnt working on 2,3,or 4 speed it wont let the ac turn on,if all that checks out ,turn the fan on high max ac unplug the green wires or wire on the compressor right behind the belt pulley,check for 12v dc,if none,you lost a relay or one of the pressure switches,fuse,maybe broken wire,if 12 v. is there,your clutch coil fried on the compressor pulley,good luck, hope you figure it out

Jul 07, 2009 | 1998 Jeep Grand Cherokee

3 Answers

A/c not blowing cool air all of a sudden. Then smoke from the engine not alot but I think it's from the a/c it's self. Let me know if anyone experience this type of problem?


If a/c pressures go too high, it will blow open the safety valve. This is usualy due to the cooling fan not working. Did engine get hot too. Temp gauge go high?

You will need to add freon. A/c service port is behind right fender liner. remove liner for access. Do not overfill. Get R134A can with gauge on it.



please rate.

May 05, 2009 | 2000 Ford Focus

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