Anyone ever solve the Fusion AC blowing hot or cold based on fog lights being activated issue?

3572 Views 3 Replies 4 Participants Last post by  LakePlacid

I'm new to the forum and I'm looking for some insights into an odd problem. I've got a 2011 Fusion with the 4 cylinder and manual AC. The AC started blowing hot (not just not blowing cold, but only blowing heated air). I can hear my blend door humming as I change the temperature, so the blend door is working. The only thing that works is this quirky advice I've seen on several forums suggested by several people: keep the lights and fog lights on and the AC will stay cold. It sounds weird, but I can confirm that this trick does work. My AC blows consistently cold only as long as the lights are on. My question is: does anyone have an explanation for this and will replacing the AC control module address this odd electrical cross-over?

Thanks for the space to pose the question.
  • Like
Reactions: 1
1 - 4 of 4 Posts
Never heard of this but going to check it out. I’d of suspected a faulty blend door motor. Just because they hum does not mean it’s working correctly.

Sent from my iPhone using Tapatalk
  • Like
Reactions: 1
First im new to the forum, so hello.
So original fusion owner 2010 2.5 auto SE.
Yes the fog light trick works.
Years ago has the HVAC control panel replaced helped for a couple years.
Then again fog light trick. So replaced the blend door, that worked till this year. Again fog lights.
So when parking turn off AC, turn off lights, then car, reverse order when starting and not to quickly. Also helps to park in shade and use a window visor. The hotter the car parked the harder it is to get AC working.
Next i plan on actually using a manual choke cable to "override" blend door.
Cause a black on black car is ridiculous in summer especially when such a small electric short is ruining it.
I have a 2010 Ford Fusion SE, 4 cyl. My air was doing likewise. Ford dealership said it was temperature control head. If that didn't work, blend doors may be a problem, but only diagnose after temp head replaced. At the same time battery would go dead. Called road service for dead battery. Air blowing hot and cold at same time. Road service said battery ok and alternator ok. Went to auto parts store, battery ok and alternator ok. Went to Ford dealer, battery ok. Alternator ok according to Ford. Battery was under Ford warranty and Ford would not replace battery since test showed ok. For Ford to warrant battery, test sent to Ford. Had disagreement with dealer over price to repair a/c. Told dealer to stop all work. Replaced battery, air working like artic air. Everyone involved dumbfounded. Even sought auto mechanic online. Both said blend doors. Battery will show no problem, but it was the problem for me.
  • Like
Reactions: 1
1 - 4 of 4 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.