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1995 993 cab rear heater blower

Heating and Ventilation

Vehicle Information: Model: 993; Year: 1995; Body Type: Cabriolet; Total Mileage: 78,000;

Joel, below is our correspondence history. You asked me to tell you what the solution to the problem was, once it was solved. The problem was created by crossed wires. The folks at Arlington Porsche figured it out through some trial and error. They believe that the wires were crossed during a recall performed for an unrelated part (at another Porsche repair shop). I''m glad I took it in after trying a few replacement parts, or I would have gone crazy trying to determine the cause.Your technical question posted on PCA.ORG has been answered.Please do not reply to this message, as it was sent from an unmonitored email account.If you wish to follow-up on your question, please use the PCA.ORG Tech Q&A at 964 / 993 / 996 incl. Cup carsClassification: Heat and VentilationSubject: 1995 993 heater blowerQuestion:Joel, thanks for the response to my question (below). I changed the relay for the heater blower, but that did not solve the problem. I had previously replaced a resistor and a temperature sensor, both of which plug into the heater blower unit. Is there another temperature sensor that controls the operation of the heater blower, or is there any other cause you can think of?Area: 964 / 993 / 996 incl. Cup cars Classification: Heat and Ventilation Subject: 1995 993 cab rear heater blower Question: The rear heater blower of my 1995 993 cab continues to run about 15-20 minutes after I turn off the ignition. I understand this should occur when the engine is very hot. However, the blower runs even when the engine has only been operating for several minutes in cold whether. I have replaced the heater resistor and the temperature sensor, but these replacements did not fix the problem. Any ideas as to the cause and the solution? Answer: When you say the temperature sensor, there are a number of them. If you mean the one right by the blower itself, yes I agree that is the first one I would think of. Past that I would plug in the Bosch Hammer or PST2 and see what is going on in there, and see if the control unit has any faults stored. If you don''t have one of these tools, you will need a Bosch or Porsche shop to do this. If you want to try something else first, you could change out the rear blower relay in the engine compartment, maybe it is stuck and is unable to release. If anyone has any other ideas I will pass those along, and if you wouldn''t mind letting me know how you make out with this, I would appreciate it. Joel Reiser - PCA WebSite - 3/5/2005Answer:The sensor in the heater blower duct itself is the one that is used by the climate control unit to decide whether to run for 15 minutes after the ignition is switched off. The next sensor is in the climate control unit itself. After that comes the two mixing chamber temp sensors in the air guide housing. These are located in the same general area as your pollen filters. There is a plastic square cover hiding them from the pollen filters, one on each side. That is, there is a temp sensor in a hidden compartment off of each pollen filter housing. I would still like to see you get the car plugged in to the diagnostic computer so we can see what the control unit sees, and maybe hear what it has to say about it. Joel Reiser - PCA WebSite - 4/4/2005

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