My heater is not working
 

For some reason my heater doesnt work.....once in a while i will feel hot Air for the first 3 seconds of turning it on....Do you know what I can do or should i have my mechanic look at it.

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85.5 Porsche 944

Valve that controls water flow is just in front of firewall. You could start there. Sounds like little water is getting to heat exchanger. Feel both sides of hose. If one side is a lot cooler than the other, little water is flowing.

If you mean your blower is now blowing hot air, then swap your blower relay with your fog light relay. (check yours, but on my 944na 85.5 they are the same part number) It fixed my intermittent 'heater' problem, and didn't cost a dime...also for whatever reason, my fog lights work fine.