Why does my heater blows warm air in the summer and cold air in winter?

30

Asked by GuruSBSQT Aug 06, 2020 at 03:50 AM about the 1987 Mercury Grand Marquis LS Sedan RWD

Question type: Maintenance & Repair

Heater blows warm air in the summer with controls set to off.  Heater blows cold air in winter  controls set to on.  Thermostat replaced, new radiator, new blower switch, new heater control valve. Any repair suggestions?

1 Answer

3,775

blend door issues, perhaps. Or worse, broken actuator ( interior ).

2 people found this helpful.

Your Answer:

Own this car?

Share your experience with others.

1987 Mercury Grand Marquis

Review another car

CarGurus Experts

  • #1
    Tracy Hooks
    Reputation
    9,880
  • #2
    Trippmeister
    Reputation
    5,170
  • #3
    Bob Beaman
    Reputation
    3,890
View All

Know more, shop wisely

Search

Related Models For Sale

Used Lincoln Town Car
15 Great Deals out of 368 listings starting at $1,500
Used Ford Crown Victoria
124 listings starting at $2,495
Used Ford F-150
6,513 Great Deals out of 176,133 listings starting at $1,900
Used Honda Civic
1,422 Great Deals out of 28,580 listings starting at $1,550
Used Toyota Camry
2,299 Great Deals out of 44,437 listings starting at $1,150
Used Buick LeSabre
155 listings
Used Chevrolet Caprice
70 listings starting at $7,495
Used Honda Accord
1,596 Great Deals out of 25,156 listings starting at $500
Used GMC Sierra 1500
2,039 Great Deals out of 64,832 listings starting at $1,400

Used Cars for Sale

2011 Mercury Grand Marquis For Sale
9 listings starting at $5,480
2009 Mercury Grand Marquis For Sale
15 listings starting at $4,344
2008 Mercury Grand Marquis For Sale
20 listings starting at $1,999
2007 Mercury Grand Marquis For Sale
22 listings starting at $3,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.