clangjr

I just got my first Porsche, an 86 951, a week ago. Since owning it, I've noticed that the interior temperature of the cabin gets pretty warm. It seems to come through the vents even though I have the temperature set to the lowest setting. The a/c has been converted and is fully functional.

Now keep in mind I am an absolute newbie to this car and I have no idea how to properly work the heating/cooling system, how do I better regulate the interior temperature? Someone please explain all the buttons!!!

Thanks,
Chuck

Bhj0887

Check the vaccum lines at the heater control valve its at the back of engine near the firewall. These cars are designed that when parts the heating system fails it fails in a way that the heat stays on. Don't ask me why it just does.

It also might be the damper linkage...I don't know how to solve this problem but it could be your problem.

Mike B

Sounds like the pesky plastic clip problem. Clark's Garage has a good write up, 944 Heater Malfunctions. Clark also has this pic where you can see the plastic clip in question.

The 944 owners manual has the info about how the heater controls work

JimV8

I have a similar problem and the heater control valve seems to function properly and the problem is intermittent and I wonder if the control is malfuntioning. I read on here somewhere that the connection between the control and the plug in the dash develops corrosion so thats my next avenue to check. Also I understand that the default setting is full heat so you might want to check your fuses also.

BruceWard

It probably is the $2 little plastic clip. http://www.paragon-products.com has a howto on it at http://www.tech-session.com/kb/index...x_v2&id=44&c=4 .

You should check the HCV as well. The HCVs have a tendency to blow out and spill your coolant all over the place. I replaced the plastic HCV in my 968 with a dicromated steel version from a Audi 5000.

Bhj0887

Jim,

Since your problem is intermittent, you may have air in the coolant system. I had the same exact problem. There's a write up on clarks garage on how to vent it.

BruceWard

When you had air in your cooling system did the temp guage show the car was running hot? I ask because I am not sure if it would, if the air was at the temp sensor it might not.

http://www.clarks-garage.com/shop-manual/cool-02.htm is the Clarks Garage howto. Its free to try it, but I think the problem is likelyt to be that little clip. To bleed the cooling system go by an autoparts store and pick up a loaner radiator pressure tester. Then attach it, pressurize the cooling system and open the bleed valve. You can even do it in their parking lot. But for safety please make sure the coolant is not too warm before working with it.

clangjr

FYI: It was just the plastic clip and the little metal clip that goes over it. Replaced it, which took all of 30 seconds, and all is well in the world.
Thanks!!!!!!!
Chuck