Question about 1999 Mercury Mountaineer

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Ac blowing warm when I accelerate...

As long as I am going 20-30mph my ac blows cool. but when I accelerate in highway it blows warm...Help

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  • 341 Answers

Make sure the thermostat is set to cold. just switching a/c on does not cancel the therm setting. or possibly you need to recharge your a/c system....

Posted on May 07, 2014

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Posted on Jan 02, 2017

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SOURCE: ac not blowing cold air.

Sounds like the compressor has failed.

Posted on Apr 19, 2009

  • 1 Answer

SOURCE: 2000 MERCURY SABLE

My 2000 Sable starts blowing hot air about every 6 months. I mean like an oven. All I do is disconnect the battery negative terminal for about 5 minutes. After I re-connect the problem is solved. This solves many problems on this car, it just needs a re-boot. It must be powered by Microsoft (ha ha). Good luck. ps my auto headlamps never did work right either. Dave.

Posted on Apr 21, 2009

redbeard00
  • 957 Answers

SOURCE: ac compressor cuts on and off and no cool air blows out .

Too many reasons why but it probably needs to go in for repair. compressors will cycle on and off if the system is under or over filled. If there is a flow restriction, a collapsed high pressure hose, clog somewhere in the system(some vehicle owners put sealant or refrigerant with sealant in it) bad idea. Good luck.

Posted on Apr 29, 2009

  • 1 Answer

SOURCE: why wont my heater or ac fan not blow in my car?

I'm having the same problem,and I've already checked the fuses. Is there some other possibility?

Posted on Dec 30, 2009

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SOURCE: AC blows hot air but AC compressor works

if the compressor works and your freon is charged it may be the blower flapper door....disconnect battery for 10 minutes and then re-connect to reset the electronics that control the flapper

Posted on Jul 19, 2010

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Hi! My ac goes from blowing thru the dash to the floor during acceleration and driving at highway speeds. Cools great. Thanks! - Kerry


Sounds like a possible HVAC mode control issue,would need more vehicle info to make an educated guess.

Aug 19, 2015 | AC Cars & Trucks

1 Answer

Only blows heat when accelerating


the ac core only blows cold air but You must be talking about the heater core.. In which case I would suggest that you bleed the air out of the coolant system as there is an air lock in the heater core.

Jan 07, 2014 | 2009 Ford Focus

1 Answer

What controls the radiator cooling fans in the ac mode on a pontiac torrent 2006


Well the computer activates the relay for the fans when needed.
You should be able to jumper the relay to check the fan operation.
The fans come on when the ac pressure reaches 200psi or so, not as soon as you turn the ac on.

Jul 27, 2012 | 2006 Pontiac Torrent

2 Answers

Air conditiner cools on right side but not on left side


It can be issue with blend door actuator or vacuum leak or loose vacuum hose connection.
I suggest you few help links.Click the link below and follow the troubleshooting.
-----
A/C Blows Warm? http://whoisbyme.blogspot.in/2012/06/2005-chrysler-pt-cruiser-ac-blows-warm.html

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A/C blows Cold From Defrost Vent Only? http://whoisbyme.blogspot.in/2012/06/2009-mercury-grand-marquis-ac-blows.html
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A/c Blows Warm on driverside? http://whatisbyme.blogspot.in/2012/06/2007-kia-spectra-ac-blows-warm.html

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A/C compressor clutch won't engage http://schematicsdiagram.blogspot.in/2012/04/2000-cadillac-deville-ac-compressor.html

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Ford : A/C blows Warm? http://whoisbyme.blogspot.in/2012/06/2007-ford-freestyle-ac-blows-warm.html

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Thanks.

Jun 26, 2012 | 2005 Ford Five Hundred

1 Answer

Ac cools for sort time then blows warm air


I have a 98 ext. cab with AC, it was a low charge on mine. An O-ring was leaking. good luck, the O-ring set is cheap. I think it was autozone that carried them.
regards, gthsr911

Jul 09, 2010 | 1998 Ford Ranger SuperCab

3 Answers

Ac system does not get cold


you should go to a mechanic and check the A/C if the freon id low it won't cool , some time at mornig it give you the semsation that is cooling but probably not..

Aug 01, 2009 | 1999 Volkswagen Cabrio

1 Answer

Ac works great on highway but is blowing warm air out in stop and go traffic, could this be a problem with a switch or something more serious


Since your a/c unit works well on the highway, this means it still has cooling capacity, although reduced.

This can be attributed to a low refrigerant (R134 or R12) which has a difficult time to cool and pressurize your cooling coil because of the lower RPM in stop and go traffic.

Have that checked out and see how it goes.

Hope this helps.

Jun 29, 2009 | 2006 Hyundai Elantra

1 Answer

Ac blows warm air onb acceleration


Sounds like throttle A/C cutoff. Check at what point A/C stops. Full throttle, 3/4, half, etc,... You can disable the throttle A/C cutoff. This is designed for increased performance. Check manual for your cars setup.

Jun 24, 2009 | 1987 Nissan 300ZX

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