Menu toggle

Radiator fan randomly cuts in

metric_thumbs

metric_thumbs

New member
Hello all, a while since I posted. Still putting miles on the CGT and loving it.

Some advice please

The radiator fan cuts in after I have parked up. Normally it should do this if the engine is hot and until about 2 months ago it was doing that. A couple of times over the last two months I have come to start the car but the battery is very flat. I have tracked this down to the rad fan starting even when cold. Temporary solve is to remove earth strap on battery whilst parked. Hardly elegant.

i have looked at the circuit and see not only the regular temp. cut in switch but also the temperature time switch which I guess kept the fan running on a hot engine when I locked it up in the garage.

Before I go taking bits off the car has anyone else had a similar problem and can anyone recommend a fix?

Thanks in advance
 
For me the temp switch on the rad was faulty. Tapped it a few times and the fan would turn off. New switch cured it.
 

ORIGINAL: metric_thumbs
The radiator fan cuts in after I have parked up. Normally it should do this if the engine is hot and until about 2 months ago it was doing that. A couple of times over the last two months I have come to start the car but the battery is very flat. I have tracked this down to the rad fan starting even when cold. Temporary solve is to remove earth strap on battery whilst parked. Hardly elegant.
i have looked at the circuit and see not only the regular temp. cut in switch but also the temperature time switch which I guess kept the fan running on a hot engine when I locked it up in the garage.
Before I go taking bits off the car has anyone else had a similar problem and can anyone recommend a fix?
Click to expand...

Yes, I had the same problem (on a 944) post and info is here:-

http://www.porscheclubgbforum.com/tm.asp?m=697584&mpage=1&key=&#703915

enjoy [;)]
 
Thank you both

I wil just locate and swap standard temp switch - see if that cures the problem.

Today I have been trying to trace fuses and relays. No diagram I have found - usual Haynes and internet sources has anything close to what I am seeing in the passenger footwell.
I thought mine would be exactly like a 1981 Turbo. But the relays I pulled and fuses I removed didn't make any difference, the fan kept trundling.

Do you know of a source of model specific wiring diagrams?

Thanks again
 
Can't help with the wiring but just to reinfoce the opinion. I have/had exactly the same issue with my 944 T. Go to start, battery flat. I took the relay out and then forgot I had momentarily during the cold snap, which resulted in the temperature going up to about 3/4 hot, nowhere near the danger mark though. Interestingly the fans now cut out but do not go to half speed when the iginiton is off. I'll settle for that right now as it is supposed to be a real pain to fit a new switch, but I'll be damned if I'm going to drain the system unless I have to as I understand it is just as much of a pain to get rid of the reknowned airlock.
 
I reckon you are correct on replacing the switch. Probably meant to be done from below which means removing the undertray

I shall go back to locating the relay for that temporary fix.

Maybe wire in a simple circuit that allows me to manually switch fans on. That would appear to be an altogether simpler and more robust solution
 
Have you by any chance investgated the possibilty that the wiring diagram might be right at the back of chapter 13 in the Haynes. I ask this because there is one with the air con circuit so the CGT might use that. SOme models of 924T had air-con. The redoubtable Mr Ives has that option on his red 924 Turbo, I have seen the pipes.
 

ORIGINAL: 924nutter
I'll settle for that right now as it is supposed to be a real pain to fit a new switch, but I'll be damned if I'm going to drain the system unless I have to as I understand it is just as much of a pain to get rid of the reknowned airlock.
Click to expand...

As an update on my referenced post, I didn't have to drain the system, I put the new switch in immediately after unscrewing the old one. I did lose some coolant (about a pint) but didn't lose enough to get an airlock. Just topped up the reservoir after running up to temperature (and letting it cool down too). As jobs go, it was quicker to do than to think about before hand . . .
 
That was my secret plan Vince. Sometimes Clark's Garage is a bit thorough, but then with the American sue you syndrome I'm not suprised he double dots the I's and crosses the T's
 
You must log in or register to reply here.

Posts made and opinions expressed are those of the individual forum members

Use of the Forum is subject to the Terms and Conditions

Disclaimer

The opinions expressed on this site are not necessarily those of the Club, who shall have no liability in respect of them or the accuracy of the content. The Club assumes no responsibility for any effects arising from errors or omissions.

Porsche Club Great Britain gives no warranties, guarantees or assurances and makes no representations or recommendations regarding any goods or services advertised on this site. It is the responsibility of visitors to satisfy themselves that goods and/or services supplied by any advertiser are bona fide and in no instance can the Porsche Club Great Britain be held responsible.

When responding to advertisements please ensure that you satisfy yourself of any applicable call charges on numbers not prefixed by usual "landline" STD Codes. Information can be obtained from the operator or the white pages. Before giving out ANY information regarding cars, or any other items for sale, please satisfy yourself that any potential purchaser is bona fide.

Directors of the Board of Porsche Club GB, Club Office Staff, Register Secretaries and Regional Organisers are often requested by Club members to provide information on matters connected with their cars and other matters referred to in the Club Rules. Such information, advice and assistance provided by such persons is given in good faith and is based on the personal experience and knowledge of the individual concerned.

Neither Porsche Club GB, nor any of the aforementioned, shall be under any liability in respect of any such information, advice or assistance given to members. Members are advised to consult qualified specialists for information, advice and assistance on matters connected with their cars at all times.

Porsche
Lockton
Pirelli
Officially approved
Oracle Finance
WEX Esso
Collecting Cars
Archant Dialogue
Back
Top