jeffnudd

Hi Guys

I have Porsche 911 (964) on a 1990 3.6

I tried the heater out today on hot and seem to have good hot heat from the passenger side and cold on the drivers side?

Could anyone point me in the right direction please?

Cheers

Jeff

JasonAndreas

The servo motor that controls the temperature mixing chamber on the left hand side (assuming you have a RHD) has failed, #2 in the image below. There is an article located HERE that goes into detail explaining what you need to do to fix the problem.

SimonExtreme

Jedd

Not trying to pick a fight but.............................................

Can you explain the thinking behind testing the heater on the hottest day of the year

911addict

Mine pumps out HOT air even on cold setting and OFF!
Now that IS a problem on the hottest day of the year!!!

last toy

jasonAndreas explanation covers both problems. The servo is either stuck in wide open or closed position. Go to www.porsche964.co.uk and click on the "tech" section. Go to electrical and you will find an article about the servo. It's easy to remove and fix and that is the solution to no heat or to much heat.

911addict

Yes very helpful article. I have passed it onto my mechanic for when he looks at it next week. Thanks.

jeffnudd

LOL, i was just curious as i tested it a while ago and thought i was just dreaming, never gave it a thought that something might be broken on the trusty Porsche, so now i have to get my lazy *** down my garage and fix it.

Cheers guys for info, i almost got the car on the ramp and start ripping the heat exchanger off, luckely i looked to see the replies i have here.

I will let you know the outcome :-)

jeffnudd

Finally got around to looking at the heater.
Exactly what you guys said, servo 2 had given up, so i stripped it down to find the circuit board that the spring sprocket runs on had a piece missing (must of corroded away) and everytime i wanted hot air it wouldnt move because the sprocket had moved over the burnt bit and stopped, so another servo needed.

Cheers guys