why does my air condition keep blowing heat when i turn it on air condition

Asked by Mar 07, 2015 at 08:56 PM about the 1997 Mercury Grand Marquis 4 Dr LS Sedan

Question type: Maintenance & Repair

the air condition keep blow heat even when i turn in on air condition. the compresser is turning, and the lines are cold but the air want come out cold

2 Answers

89,035

The most likely problem is a heater door failure, if you have an HVAC system it could be a failed servo motor failure, if you don't it could be a vacuum problem with the mode switching.

860

Older vehicles used manual cables to open and close the doors, so I'd look in that area if you have manual controls, otherwise look into what is controlling the door to divert the incoming air supply source properly.

1 out of 1 people think this is helpful.

Your Answer

Add photo

Related Questions

  • Why does the air conditioning keep blowing hot air 7 answers

    Hello, We have a 2005 Mercury Marquis, and the air conditioning keeps blowing hot air. It has been to the car dealer eight times. Also the dash panel gets hot as well. Every time we take it to the dea...

    2005 Mercury Grand Marquis GS

    -

    Maintenance & Repair

  • my heater and my air condition has stopped working 3 answers

    no air or heat blowing at all fan does not come on changed some fuses still no change

    2000 Mercury Grand Marquis LS

    -

    Maintenance & Repair

  • why is air condition air not cool after replacing compressor 4 answers

    compressor was replaced yesterday and today the air is not blowing as cold as it needs to on a 2001 mercury marquis

    2001 Mercury Grand Marquis

    -

    Maintenance & Repair

  • Air Conditioning 3 answers

    The air conditioner will not blow cold in my grand marquis. It has freon and the compressor kicks on, it just won't blow cold.

    1999 Mercury Grand Marquis 4 Dr GS Sedan

    -

    Maintenance & Repair

  • air conditioning 10 answers

    Blows cold when cold outside,but hot when hot outside.

    2002 Jeep Liberty Sport 4WD

    -

    Maintenance & Repair

Search Mercury Grand Marquis Questions

Mercury Grand Marquis Experts

#1 Tracy Hooks
Tracy Hooks
Reputation 5,290
#2 kbro
kbro
Reputation 2,050
#3 Js08016
Js08016
Reputation 1,660
View All

Related Models For Sale

Used Ford Crown Victoria
12 Great Deals out of 948 listings starting at $2,990
Used Lincoln Town Car
26 Great Deals out of 1,805 listings starting at $1,695
Used Chevrolet Impala
544 Great Deals out of 28,509 listings starting at $700
Used Ford Taurus
193 Great Deals out of 19,234 listings starting at $500
Used Ford F-150
2,403 Great Deals out of 210,248 listings starting at $895
Used Ford Mustang
333 Great Deals out of 45,576 listings starting at $2,000
Used Honda Accord
679 Great Deals out of 82,247 listings starting at $500
Used Cadillac DeVille
5 Great Deals out of 1,580 listings starting at $2,900
Used Chevrolet Caprice
143 listings starting at $11,995
Used Chevrolet Tahoe
611 Great Deals out of 27,552 listings starting at $600

Used Cars For Sale

2011 Mercury Grand Marquis For Sale
4 Great Deals out of 41 listings starting at $3,900
2010 Mercury Grand Marquis For Sale
7 Great Deals out of 95 listings starting at $3,999
2009 Mercury Grand Marquis For Sale
3 Great Deals out of 95 listings starting at $4,299
2008 Mercury Grand Marquis For Sale
6 Great Deals out of 141 listings starting at $500
2007 Mercury Grand Marquis For Sale
4 Great Deals out of 152 listings starting at $1,900