Question about 2006 Mercury Grand Marquis

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The ac compressor is not engaging all the time, it starts and then after a few seconds will stop. the unit is only blowing out hot air

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Sounds like the pressure switch is not sensing the correct pressure

could be a bad switch or actually low pressure

install a pressure gauge and test to confirm correct charge

Posted on May 15, 2010

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Ac blowing hot air tried to recharge but compressor would not take charge,gage needle went to yellow could over charge stop compressor 00linc ls v8


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You would need to find out if the compressor continues to run when the cold air stops.

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HY MY NAME IS DUANE AND I NEED HELP FIGUREING OUT WHY MY AC WORKS GREAT IT'S BLOWS ICE COLD AND SOMETIMES IT BLOWS HOT IT JUST STARTED A FEW DAYS AGO WHAT DO THINK IT MIGHT BE? THAKS YOU


it may be that the clutch on the A/C compressor is faulty & sometimes it doesn't engage or it could be a wire is loose or a loose connector plug, next time it blows hot air when it should be cold lift the hood & make sure that the clutch on the A/C is engaged ......hope this helps......cheers.

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A local garage mechanic says the clutch has stopped working on ac that is why it blows hot air instead of cool says it will cost $900. to fix cause I have to buy the whole ac unit does this sound correct?...


have you tried charging the ac system? most ac compressors have a pressure switch that will not allow the relay to engage the clutch if the coolant pressure is low. $15 can of r134a and maybe a $20 Haynes manual is well worth the price difference, eh?

Jun 07, 2011 | 2004 Kia Sedona

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AC will blow cold air for a few minutes then start blowing hot air, cut the engine and start it again and blow cold air for a few minutes then start blowing hot air again. Just filled up the freon and the...


you have moisture in the system this causes your expancion valve to freeze up an stop working, thats why it works for sort time and when it de-freezes stars working again. you need to do a EVAC & RECHARGE with a good AC service equipment, specially attention to pull vacumm por at least 20minutes so you get all moisture out of the system.
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Jun 05, 2011 | 2002 Hyundai Santa Fe

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My 2002 Expedition air conditioner will sometimes blow hot air and others cold air


I would check the following possibilities:
1. Is compressor clutch working? - You need to do this when the ac is blowing hot air only - locate compressor drive pulley on engine - rubber belt wraps around it. Start engine and set to max ac. When the ac is blowing hot air, look at the center of the compressor drive pulley using a good flash light - watch it for a while, it should be spinning with the pulley - this means the compressor is engaged. If not, the compressor is not engaged. If your ac is blowing hot air, then the compressor should be engaged and running (trying to cool). If it is not engaged, then your compressor clutch is probably going out. Could be low voltage to clutch, but more likely the clutch is worn out and only working some of the time. Note: if working normally, the compressor clutch will engage and disengage in cycles- but the air should always be cold. If clutch is bad, compressor would need to be replaced (sold as one unit). This is tricky to diagnose and could take some time - you need to do it when ac is blowing hot air but set to max cooling.

2. Low on refrigerant or refrigerant has moisture in it? If your ac blows cold initially after being off for a while, then heats up, and continues to regularly cycle back and forth between hot and cool air, then the system may be low on refrigerant or the refrigerant may have moisture in it that is freezing and restricting refrigerant flow. An a/c shop can check refrigerant level and even replace refrigerant if moisture is suspected.

Could be other issues, but I would start with these.

Good luck

May 07, 2010 | 1999 Ford Expedition

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1999 Mitsubishi Eclipse Spyder A/C Only Blows Hot Air


I would take it back to whoever replaced the module however, if you want to check for the problem yourself, Look for the AC compressor. with the AC turned off have someone start the vehicle, while watching the AC compressor have the person in the vehicle turn the AC on. If the clutch engages then you have lost your freon charge and need to have the AC unit serviced. If it does not start turn the engine off and check all the wiring connections going to the AC compressor. If all the connections are good start the vehicle, and have the person in the vehicle turn the control to cold and turn on the defroster. If the AC clutch engages then you have a bad ECM module or mis-programmed ECM take it back to be Properly programmed and repaired. If the clutch does not engage it is possible the AC compressor is bad. Take the vehicle to the Mechanic to have teh AC system checked to see why it is not engaging.

Aug 27, 2009 | 2000 Mitsubishi Eclipse

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The air conditioner was working, but after a short stop and after starting the engine up again, I only got hot air blowing out of the vents. The rear air unit showed ''Power Off'' when I tried to see if it...


There are 2 problems:
1-
To keep the AC on there are a lots of feed back to Engine control unit from: Refrigerant press, Engine temp sensor, Evaporator Temp sensor, Cabin Temperature sensor, Compressor Speed sensor, Engine Speed Sensor. All of these need to be in the spec range for the Compressor clutch to engage then AC could function properly.

2-
The hot air blowing out since your blower is still working, but divert valve problem: The divert Flap vent instead of directing air through the evaporator path, It is directing the air through the heater core.
Unless you have equipment to check all of that and time consuming, you might want to have a hsop to estimate first ro pay an diagnostice and decide to fix later after decide the problem could be tackled by your expertise. I'd check back to see how your progress on this matter. Good luck in good findings.

Jul 05, 2009 | 2003 Oldsmobile Bravada

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My 1996 Lincoln Town car heater works but you cannot control the temperature and the air conditioner blows out hot air when turned on.What could be the cause of this problem?


To fix the AC unit which blows hot air all the time. Seems like you have a small leak in the system or the AC compressor has gone out. Suggest you try recharging the unit. Make sure you have the correct R-22 or 134A freeon. If this work for a few days then have the leak fixed, if this doesn't work replace the compressor. Check Ebay for the compressor i obtained one for $100.00. Cost $450 at Auto Zone.

Jun 26, 2009 | 1996 Lincoln Town Car

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