[uvachief]

When I bought my 86 944 na, I had heat all the time. The clip in the footwell had broken and it had defaulted to full heat. Ran me out of the car. I installed a new clip and guess what? No heat 95% of the time. It was coming and going and mainly not coming. Checked the vacuum lines. Found one old one to the heater core frayed and barely on. Fixed that. Had heat for a day. Thought I had solved it. Heat disappeared the next day. Assumed it was the heater core. Removed and replaced that during the top end engine rebuild. Had heat for a week and then no heat. Kevin Kaminski told me it was the HVAC control uit in the dash. He had swapped one with a known working customers in his shop. I bought several off Pelican Parts Classifieds. Swapeed all of them in and out over time. One had to work right? No change in the no heat problem. I was beyond irritated.

I kept driving by this little import repair shop not far from my house. I saw one of the mechanics had an early 944 na. Figured I would give it a shot. Dropped it off to him. 2 business days later - he called. It was a defective HVAC control unit. He was able to source a rebuilt or reconditioned unit for less than $150. Installed it and voila, I have heat now. Just passing this on as a warning about buyung used parts - even on Pelican. Also, maybe it will help trouble shoot someone else's no heat problem. Good luck!