blowing cold air

[Kingofthe_roadM5]

Question for Sheldon. You have posted about blowing cold air awhile back and I need to know if you got it fixed cause I'am having the same problem now. I need info from you if you don't mind. or anybody from this board
Thanks.
Jessie

[Sheldon]

Nope, still haven't figured it out. I had it out on Sat. night when it was about -5F. Once it got warmed up, as long as I stayed below 60-65mph it was ok, but as soon as I got up around 75 it started blowing cold again....very strange. Still haven't gotten around to putting in a new heater valve either.

[ahwang]

[ahwang]

I also have a question regarding heater blowing cold air
When I turn on heat, seems that heat only blows from the top of dash and would not blow from front dash vent.
Which part could be broken?
Thanks
Andrew

[billings88]

Just to jump on the bandwagon, but I also have the same problem. Hot air out of the defrost vents and the floor, but cold air coming in below the stereo. Faster I go, the more cold coming in. I am assuming that there is a "flap" that is not closing when I flip the switch from fresh air to recycled air.

Anyone have thoughts, or how to fix?

Eric

[johnh]

most likely you'll have to do the heater control valve on the firewall

[johnh]

heat should come out the defrost vents and the heater vents down by the tranny hump.
No air at all ever domes out of the big vent in the top center of the instrument panel. It's a dummy... was used in early E28s.
Cold air always comes out of the center vents (the center slider on the HVAC controls. Those vents on the front of the instrument panel, left, 2 center, and right, blow either A/C or fresh cold air... never any heat.

[ahwang]

Thanks. I should have searched the archives for this. Feel so dumb now.

[Kingofthe_roadM5]

Where is the heater control valve on the firewall (inside or outside).no experience on this problem yet.

Jessie

[Sheldon]

Inside the engine compartment attached to the firewall on the driver's side. Has a 2-wire connector going into it. Remove the 4 screws on the top and the solenoid pulls out, usually the rubber bellows on the bottom of the valve fails. Can get a rebuild kit from most aftermarktet places for less than $50.

-Sheldon

[Kingofthe_roadM5]

Thank you Sheldon. U The Man.

[bruce in Canada]

[tdhardin]

I just read a message talking about a post about a fresh air actuator flap....chriss graff was the author, does anyone know the location, I know there are tons of us with this issue, hot air intrusion dureing summer cold air intrus during winter,
I will post a good dyi job write up on this when i solve it. help!1
Damion

[Kurbatov57]

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[tdhardin]

[Oops!] has got it for 20 and change...cool soundtrack during the wait too...
Damion
e28 m5