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Registered
Join Date: Dec 2005
Posts: 3
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Odd Carrera 3.2 heater problem
My US model 87 car with manual heater controls has developed an odd problem. First all 3 heater blowers stopped working one day, so I quickly checked all the fuses front and back (all OK) and found that there was power at the floor levers and the rear fuse box that supplies the relay, but not at the main blower. However, after a couple of days use they all started to work normally again (on and off). Next, after a long drive to the UK from Belgium where I live (winter, so with the heater on) I parked the car for a day and a half and when I got in (ignition still off) the footwell blowers (without the rear blower) were still running! Once started, the rear blower cut in as normal. On the train in the Eurotunnel, the footwell blowers also continued with the ignition off. I tapped the main blower control relay lightly and they stopped, but none of the blowers worked for the rest of my trip home to Brussels. Reading the wiring diagrams in my Bentley manual, I concluded that only a sticking main blower relay/control unit could cause this combination of symptoms since it is hot at all times and controls the footwell and rear blowers independently, despite various opinions here that the footwell blowers can only run with the main blower on. So, I ordered a new relay from Porsche and have now replaced it. But, stilll no blowers!! Any ideas?
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12-04-2005, 12:07 AM
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911 carrera 3.2 (1985)
Join Date: Sep 2001
Location: Harmelen, the Netherlands
Posts: 741
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I've had the same problem. After a long search my mechanic found a loose connector somewhere behind the dashboard.
Kees. 
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12-04-2005, 01:54 AM
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Join Date: Dec 2005
Posts: 3
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If this was just all 3 blowers working intermittently, I could understand the problem, but did you also have footwell blowers working sometimes with the engine and ignition turned off? If so, have you any idea where under the dash?
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12-04-2005, 02:16 AM
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911 carrera 3.2 (1985)
Join Date: Sep 2001
Location: Harmelen, the Netherlands
Posts: 741
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Sorry, can't help you any further.
Kees. |
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12-04-2005, 03:16 AM
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Join Date: Dec 2005
Posts: 3
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Fixed! On checking again, I now found that the new blower control unit again supplies power to the main blower. However, the blower motor did not run even when supplied with power. Hence the footwell blowers did not get power from the new relay without it running, since the relay is designed to work this way, even though my old one gave them power with the ignition off. Anyway, a new main blower motor in addition to the new relay has restored all 3 blowers to normal operation.
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12-10-2005, 08:30 AM
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