cooling fan wont stop

[smiffyraf1]

after a brisk run out today got back and my ran fan was running after parking which is not unusual but upon returning to my car 10 mins later was still runnning left it a further 20 and was still running so have pulled the fuse, checked the relay all contacts are fine am i looking at changing my thermostat? the temp inside the car is reading normal, reading cold but the fan still running?! any help greatly appreciated

 

[CarreraRSR]

Did the same on my 924. Needed to tap the thermostat with something to get the fans off. New 'stat needed by the sounds if it.

 

[smiffyraf1]

thanks for that, newbie question but where does it live? i know in the rad somewhere but at a glance i couldnt spot it

 

[Elliot]

back of rad with three or two pin contact. on passenger side. If you need one give me a call

regards Elliot
07514 944 964

 

[944 man]

With series two cars it can be the relay, too.

 

[smiffyraf1]

thanks for that elliot yeah ive found it tried 'persuading it' but still stuck re terminated the wires to it as well but that didnt work either. should it have two wires joining together for each contact? i was thrown off as when i googled it shows it as being on the waterpump

 

[smiffyraf1]

its a series one. ive ordered this but am not sure its the right thing now! how much for yours elliot?

 

[smiffyraf1]

quick update think my problem is the thermo switch, if you have one elliot i will have it if thats ok because i have ordered a thermostat which i cannot find anywhere on my car! not where other people say it should be anyway.

 

[944 man]

ORIGINAL: smiffyraf1

its a series one. ive ordered this but am not sure its the right thing now! how much for yours elliot?

I see. For the sake of clarity, series one cars were manufactured until Autumn 1985 and series two cars (with oval dashboards and flush fitting windscreens) were produced from then onwards. All 944s then built were series twos.

Simon

 

[smiffyraf1]

its a series one oval dash.

 

[pauljmcnulty]

I see. For the sake of clarity, series one cars were manufactured until Autumn 1985 and series one cars (with oval dashboards and flush fitting windscreens) were produced from then onwards. All 944s then built were series twos.

Simon

Put's pedant hat on...[][][]

 

[smiffyraf1]

ha ha ha we are all clear as mud then

 

[944 man]

ORIGINAL: smiffyraf1

its a series one oval dash.

If its an oval dash then it is a series two. The 'S' in 944S stands for Super, Correspondingly 'S2' is the second Super model; it doesnt refer to series two.

Simon

glaringly obvious mistake in earlier post now corrected []

 

[Elliot]

ORIGINAL: smiffyraf1

quick update think my problem is the thermo switch, if you have one elliot i will have it if thats ok because i have ordered a thermostat which i cannot find anywhere on my car! not where other people say it should be anyway.

i can not give you a priced on this forum as it is against rules but you are welcome to call me on 07514 944 964 cheers

Elliot

 

[peanut]

ORIGINAL: smiffyraf1

its a series one oval dash.

?????????? I think you mean its a series 2 oval dash ![]

I presume that you have a single fan with single speed as per a standard Lux yes ? in which case the radiator temperature sensor switch should have 2x electrical contacts.
If your car was a Turbo it would have two fans and two speed motors as I believe should any car that was fitted with Air Con as a optional extra. These would have a 3x contact switch and a double fan relay. One of the fans comes on automatically when the Aircon is switched on as it receives a bypass electrical supply via the aircon switch

There is some confusion about all this and depending on the model the schematic can be quite complex. As I understand it later cars with 2x fans have 2x speed motors but I may be wrong perhaps it is the case that the first fan cuts in at one temperature and the second fan cuts in at a higher temperature. I'll check the schematic later.

Radiator fans are wired up permantly live through the fan relay. In addition there is a seperate constantly live feed comes from the battery to the fan relay coil which then goes to earth via the radiator switch. When the radiator coolant temperature sensor reaches a preset temperature the integral bi-metal switch completes the circuit to earth which energises the fan relay coil which then switches the other live via the relay feed to the fans.

 

[sbloxxy]

While I don't want to hijack this thread, this might be a fitting place for me to ask about a question re my cooling fans. I have the opposite problem - they won't come on. Its a 1992 S2 by the way.

This problem has just arisen over the last couple of days. When I'm driving at normal motorway speeds, the needle on the temp gauge slowly creeps up to the three quarter position and if I keep pressing on, it will nearly get to the bottom of the red. When I slow down, it will sit at half way/three quarters but won't get any hotter. Its not using any coolant and there are no obvious leaks but I noticed that the fans are not cutting in, which I reckon they should be at this sort of temperature.
I pulled the fan relay (its the double type) and there are rusty water stains under the relay and the relay pins have very slight rusty discolouration too. I've squirted everytrhing with WD40 though this makes no difference.

The car has just spent the last couple of weeks outside with plenty of snow all over it and I'm concerned that water has got into the electrics.

I'll test the relay over the weekend but I'm concerned that that is the actual problem and that I might have a overheating problem elsewhere.
Any thoughts?

 

[peanut]

sounds like there has been water ingress to the relay can. You'll need to open it up to be sure.

Your car has twin fans and they should operate at two speeds depending on temperature. The fans will each have a seperate fuse .
The fans should come on before the temp guage reaches half way (depending on thermostat temp rating)
I wouldn't advise running your car again until you either find the problem or wire up a temporary supply to one of the fans at least. Head gaskets are quite an expensive job on these cars

I have a schematic of the cooling fan power circuit and relays if its any help I can email it to you if you pm me your email addy. Alternatively I can help you with a troubleshoot if you wish.

Does your car have Aircon ?

 

[MRGT]

ORIGINAL: smiffyraf1

after a brisk run out today got back and my ran fan was running after parking which is not unusual but upon returning to my car 10 mins later was still runnning left it a further 20 and was still running so have pulled the fuse, checked the relay all contacts are fine am i looking at changing my thermostat? the temp inside the car is reading normal, reading cold but the fan still running?! any help greatly appreciated

This exact same thing has just happened today to my 'S' . I have pulled the fuse to stop it but unfortunately not quickly enough to stop the battery from draining down [&o].
Are we all agreed that the likeliest cause is the thermo switch on the back of the radiator ?

Howard

 

[sbloxxy]

Update on my problem: tested the relay and thats working ok as are the actual fans.
I changed the thermostat today (swine of a job). The only place open round here was Halfords who had a thermostat on the shelf though it was a 80c unit. Anyway, being impatient, I fitted it anyway and the car is no longer overheating BUT its still running hotter than before (needle is just above the halfway mark on the temp gauge). That said, the car seems to be running fine.
However, I'm still not convinced that the fans are cutting in. What I'd like to ask fellow owners, is when do your fans kick in? Do they come on during the course of normal day to day running or do they only come on when its properly hot? Mine will get to the 3 quarters mark and still not come on and I can't help but feel that this isn't right - which points to a knackered radiator fan switch.

 

[944 man]

ORIGINAL: sbloxxy

... the car is no longer overheating BUT its still running hotter than before (needle is just above the halfway mark on the temp gauge).

Its running hotter than before, because it was running too cool. Everyone experiences an increase in running temperature after they fit a replacement thermostat.

I will try to find a hosted picture showing actual temperatures at given gauge positions, for you: this should put your mind at rest if youre sceptical about my advice... []

Simon