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Car Forum / Porsche / Porshe 944 / January 2008944 1987 cooling
Hi I have a 1987 944 standard 8 valve model. This is a UK car, RHD and has no air conditioning. It has one cooling fan which seems to come on too often. The car does not overheat and the gauge sits just below halfway. Even on a cool day the fan will be on after a run when the ignition is turned off. It will run for a few minutes. It is my view that the fan should only run if the engine gets really hot . Am I correct? The Clarks Garage site is not really of help as cars of this age without A/C and with one cooling fan are not explained. Alec I'm in the process on working on my '83 944. My problem was that the fans did not turn on. I had to replace the Auxiliary Fan Switch. Basically just a temperature sensing switch. When the car gets to hot the switch breaks down casing a short (short to ground if I remember correctly) in the fans system letting them turn on. When the car gets back to the temp it should be the switch opens those turning the fans off. You say, how is this going to help me? As I was reading up on the problem I also came across the problem of the switch acting the other way. The switch could be bad and break down a lot sooner and your fans turn on. There is a way to test this switch but it's not easy to get to. When up open the hood (or in your case the bonnet) it is located on the top right side of the radiator. It has 2 (or 3) wires coming from it. You can test it in the car by hooking an ohm meter to it and seeing what temp it takes to short the switch. A better but more work (because you have to partially drain the radiator) is unscrewing the switch (after you drain the radiator to the level of the switch). Hook up your ohmmeter and add hot water to a container with a thermostat so you can see what temp it shorts and opens. Just make sure when you're adding antifreeze to get the correct type for aluminum engines and bleed the system As far as I know, you can get 2 temp settings for these switches, 75C and 92C. good luck, Andre > Hi > I have a 1987 944 standard 8 valve model. This is a UK car, RHD and has no [quoted text clipped - 15 lines] > > Alec alec - if in doubt, just replace the switch, it's cheap. but I would not worry about it so long as the fan runs (note, I've seen three fans fail due to seized bearings - keep that in mind). it's much better to let the fan run after your drive than it is to overheat and suffer the consequences  SignaturePosted via a free Usenet account from http://www.teranews.com Thanks for the replies. I have been running the car like this for 2 years now with no problems. It runs fine and is used nearly everyday. I am slowly fixing the minor niggles that you get on a car with 148000 miles on the clock which is now 21 years old. This niggle with the fan is the one I am currently looking at. In the UK it is not exactly warm at this time of year and it annoys me that the fan runs. Some cars seem to have switches with a sensor in them and others may just be a switch. Just wish to find out how mine works before plunging in. Alec> You need to remove the fan shroud and blow the dirt etc back out of the radiator with compressed air it is a bi-metallic thermal switch that actuates a relay in the central electronics box > Thanks for the replies. > [quoted text clipped - 13 lines] > > Alec> SignaturePosted via a free Usenet account from http://www.teranews.com When you stop the car the engine is still hot but the water pump isn't pumping and the residual heat of the block will kick on the fan. Not a problem as long as it goes off eventually. Craig > Hi > I have a 1987 944 standard 8 valve model. This is a UK car, [quoted text clipped - 19 lines] > > Alec >When you stop the car the engine is still hot but the water pump >isn't pumping and the residual heat of the block will kick on >the fan. Not a problem as long as it goes off eventually. Yeah, I have a 1986 Turbo (i.e., a 951), and even on cool days, the fan can stay on for 3-4 minutes sometimes. I stopped worrying about it long ago. :-) Patty |
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