BLOWS HOT AIR

  • Tiny
  • Stephen Tatro
  • 1999 Mercury Marquis
  • 124,000 miles

My 1999 mercury grand marquis LS blows hot air. After turning the ac / heat on and off it will eventually switch back over to cold a/c. A/C will run as long as you don't change the tempature. I did check the vacuum lines and they all look like they are in good condition.

I have removed the entire dash to check vacuum lines. I also removed the ac/heater temp control unit. You know where you turn on and off the ac defroster heat ECT ECT. Any help would be greatly helpful.


Nice site :-)

Do you
have the same problem?
Yes
No
Saturday, December 17th, 2011 AT 2:18 PM

1 Reply

  • Tiny
  • hmac300
  • Expert
  • 44,316 posts

Check to see if you have a vacuum leak first, then check to see if your actuators are working. They are under dash on heat unit. Generic pic enclosed.

Was this
answer
helpful?
Yes
No
-1
Saturday, December 17th, 2011 AT 2:49 PM

Please login or register to post a reply.

Similar Questions