Went out late last night to put the bin out and could hear my fan still running, despite having turned the car off about 5 hours prior after a 35 mile trip! The battery was almost dead and being pitch black couldn't do much about it. The fan that was running is the main cooling fan between the engine and radiator not the one in front of the radiator. I have today managed to get the battery on charge and have removed the fuse for the cooling fan otherwise it just comes on again. I can hear the fan relay in the fuse box click in if I replace the fuse and the fan starts. I pressume I have a thermostat fault or similar, but does anyone know where it is situated or can help me out as to what I need to replace otherwise I am going to have an always on fan unless I remove the fuse at my journey destination.
Help! Constant fan flattening battery.
- Thread starter cuffn
- Start date
This could be your lucky day!!
I had exactly the same thing 4 months ago. The AA (who know ABSOLUTELY NOTHING AT ALL about our cars) suggested the relay was at fault (i.e. sticking on), so I pulled it out when I stopped (to prevent the battery running flat) until I could get a new one from my local Porsche centre. They gleefully relieved me of £100+, but it did not solve the problem.
There is a temperature sender screwed into the back of the radiator on the right hand side about 4" down (as you stand at the front of the car looking into the engine bay and scratching your head).
This is a far more reasonable £20, which JZ Machtech fitted for me for nothing, ( I suppose, because the amount I spend there, I think they thought they owed me one, or it was not enough for them to spend the time raising a bill).
It is probably not very difficult to fit yourself, but obviously you will loose some coolant, which will need to be replaced when the new sender is in situ.
I called up Bert Gear (number in the back of PP) 944 Register technical expert and also spoke to JZ, who both agreed that if the relay is not at fault, then this sender is.
No problems since and a cheap fix.
I had exactly the same thing 4 months ago. The AA (who know ABSOLUTELY NOTHING AT ALL about our cars) suggested the relay was at fault (i.e. sticking on), so I pulled it out when I stopped (to prevent the battery running flat) until I could get a new one from my local Porsche centre. They gleefully relieved me of £100+, but it did not solve the problem.
There is a temperature sender screwed into the back of the radiator on the right hand side about 4" down (as you stand at the front of the car looking into the engine bay and scratching your head).
This is a far more reasonable £20, which JZ Machtech fitted for me for nothing, ( I suppose, because the amount I spend there, I think they thought they owed me one, or it was not enough for them to spend the time raising a bill).
It is probably not very difficult to fit yourself, but obviously you will loose some coolant, which will need to be replaced when the new sender is in situ.
I called up Bert Gear (number in the back of PP) 944 Register technical expert and also spoke to JZ, who both agreed that if the relay is not at fault, then this sender is.
No problems since and a cheap fix.
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New member
yep. replace the thermostat first, and don't forget to bleed the cooling system. The rad is not the highest point in the system afterall. If it doesn't solve it, then see if you can borrow a relay first (i'm sure there's a couple of laid up cars over winter here to see if it works! Don't forget to ask nicely though! [
] ) You don't wanna shell out £100 on a relay, and find out it isn't that. There's plenty of better ways to spend a ton before xmas!
You can also read www.clarks-garage.com for troubleshooting tips.
] ) You don't wanna shell out £100 on a relay, and find out it isn't that. There's plenty of better ways to spend a ton before xmas!You can also read www.clarks-garage.com for troubleshooting tips.
I managed to persuade the spotty oik at Porsche centre Reading to refund me for the relay. There used to be a proper parts desk there before the revamp with a parts manger who knew what he was talking about and provided a bit of service, the spotty oik was threatening to charge me 20% for the refund, even though I only had the relay in my hand for about 2 minutes.
I guess they don't expect the current purchases of Porsches to get their own hands dirty or something?
I guess they don't expect the current purchases of Porsches to get their own hands dirty or something?
Thanks for that - fan thermostat switch seems the most likely. I had a look and it is pretty difficult to get to apart from underneath. Bottom connector was a bit corroded and seemed to have a couple of drips of coolant on it so tightened jubilee clip on hose and cleaned connectors up as much as I could get at but to no avail. Have ordered a new fan switch from Porscheshop which should be with me by tomorrow and have asked a mate at a local garage to put it on a ramp and fit it for me Saturday. Heres hoping.................
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New member
ORIGINAL: pikey7
yep. replace the thermostat first, and don't forget to bleed the cooling system. The rad is not the highest point in the system afterall. If it doesn't solve it, then see if you can borrow a relay first (i'm sure there's a couple of laid up cars over winter here to see if it works! Don't forget to ask nicely though! [
You can also read www.clarks-garage.com for troubleshooting tips.
Or you can test the thermostat quite easily. Disconnect the wires and alternately short them together, and seperate them again. The fan should turn on and off correctly. If it does, you need a new thermostat. If it doesn't, you need to keep looking for the problem.
You can save yourself 20 quid that way [
]Probably would have been, but needed to get part for next day as I was off on a booze cruise to France on the Saturday and my friendly local garage offerred to fit Saturday morning, not to mention that my nearest OPC is 30 miles away! Most of the other suppliers were around the same price but Porscheshop had it in stock and were able to post out that day even at about 16:30! The local garage fitted it for me for £44 and all seems well now. The fan does not over run on my normal journeys to and from work as it did anymore so it had obviously been on it's way out for some time. Thanks for all the advice.
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