The Shop > Under the Hood & HVAC
Always blowing hot air...unless AC is on
Factory53:
Hi Everyone,
I've been meaning to post for a while but tried doing a bit of hunting around to see if my issue has been covered. I can't seem to find it having been discussed....and maybe its not an issue, it could be just the way it is.
My 84 Eagle Wagon will constantly release hot air from the vents once it is at operating temp. Even with the fan switch in off position and even with the temperature lever in the full left position (cold) position.
The only way to get the hot air to stop is to turn AC on and turn the fan on.
I've spoken with a few mechanics and they all seem to say the same thing "These old cars just do that!"....but I feel like that can't be the end of this. :banghead:
I'm wondering if I've got some coolant lines hooked up wrong or something isn't working properly on heat/ac switches/console.
Has anyone else experienced this?
It won't be an issue in winter as I live in Canada and any extra heat is happily welcomed, but when its +35C (95F) air temp in the summer...its a bit much and my AC does work but its not super cold.
Any thoughts would be greatly appreciated.
Still Pat:
I have the same problem (minus the A/C, mine MIGHT need recharged) in my wagon. I tried replacing the shut-off valve under the hood. It WAS stuck, but it didn't help.
MIPS:
--- Quote ---I've spoken with a few mechanics and they all seem to say the same thing "These old cars just do that!"....but I feel like that can't be the end of this. :banghead:
--- End quote ---
I've been told that too. I think it comes down to how well the foam seals in the air box are holding up.
I don't have AC at all so I have fresh air vents on both sides and controls under the steering column. Even though I pulled and refoamed my air box I still get a warm air draft with the blend control all the way in the blue, unless the other lever is set to OFF. There's no door on the inlet side of the heater core so you will always have air pressure forcing itself through the core and the blend door seals. The original foam I replaced was open-cell and the replacement foam was also open-cell so my bet is if you refoam the air box with high-temperature closed cell foam it would not be as bad.
If I want "cool" air I have to use the fresh air vents.
When it was 47 here last year it's no longer cool air. It's like sitting in a blast furnace.
Factory53:
Thanks @mips and @stillpat. I'll have to take a look at the airbox and see if the foam is holding up.
There has to be a reason why so much hot air is coming through the vents even when the fan is totally off.
I'll keep digging around too, but thanks for the input you guys.
Cheers!
MIPS:
I know that the AC equipped eagles have an extra vacuum valve on the HVAC controls that activates the heater core bypass when in the COLD position. Is it possible it's out of adjustment and should also be operating the valve in the COOL position? I've never seen the assembly myself but for economy sake that makes a lot more sense.
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