fan on all the time

[pmanson]

Hi all,

Any idea of what would cause one of the two fans to run continuously? It started on Sunday.

Not driven the car since then, just been out and put the keys in the ignition and the fan cut in immediately.

Cheers,
Phill

[chris1972]

pmanson said:

Hi all,

Any idea of what would cause one of the two fans to run continuously? It started on Sunday.

Not driven the car since then, just been out and put the keys in the ignition and the fan cut in immediately.

Cheers,
Phill

Could it be the otter switch?

http://www.chimaerapages.com/resources_manual_fan....

[Trevor450]

Someone may have put a manual switch in. Sometimes they connect it the wiper stalk after putting in a stalk from a rear wash/wipe car or they connect it to the dash light switch. As above, it could also be the otter switch.

[pmanson]

Thanks guys. I was standing by the car when it first cut in I guess the otter switch is the place to start.

I assume I'm OK to keep driving it?

[Trevor450]

Fan on all the time is better than not working, but keep an eye on the temperature guage.

[pmanson]

That's good to know! Is it a TVR part or a standard Rover V8 part?

[Trevor450]

I think TVR may have used a slightly cooler one than Land Rover did.

[pmanson]

Trevor450 said:

I think TVR may have used a slightly cooler one than Land Rover did.

Thanks, just ordered one from Clever Trevor.

Cheers

[Engineer1949]

as the otter switch controls both fans via a relay if it turns out to be the switch at fault looks like the other fan will need looking at.

john

[pmanson]

Good point... both were certainly coming on the other day (I ran the car up to temp in the garage to test everything was working ok due to the cold weather).

[pmanson]

New switch has been delivered. Is there a way of getting the old one out without removing the swirl pot from the car / draining down the whole system?

[buzzsaw]

pmanson said:

New switch has been delivered. Is there a way of getting the old one out without removing the swirl pot from the car / draining down the whole system?

When I changed mine I just unscrewed the old one and had the new one ready to put back in. Change it over quickly and you won't loose much coolant, then top up the swirl pot. Its also worthwhile wrapping some PTFE tape around the threads to prevent leaks.

[David Beer]

I have never heard of an otter on all the time. Surely just unplug it to confirm before risking airlocks etc.

[Aussie John]

Just replaced mine which measured short-circuit with wires off and cold in situ; but once I removed it the measurement was as it should [o/c] changed it anyway.

[Chilliman]

I had this on mine, although IIRC it was one fan not both..had to disconnect the connecters to stop it, noticed they appeared corroded... cleaned them up, reconnected and the problem disappeared... possibly co-incidence..... Worth having a look though...

[SILICONEKID350HP]

You can buy them in a range of temps ,coming off and on at two temperatures .I went for the cooler one which means it cuts in better in traffic ,less chance of over heating .

[pmanson]

buzzsaw said:

pmanson said:

New switch has been delivered. Is there a way of getting the old one out without removing the swirl pot from the car / draining down the whole system?

When I changed mine I just unscrewed the old one and had the new one ready to put back in. Change it over quickly and you won't loose much coolant, then top up the swirl pot. Its also worthwhile wrapping some PTFE tape around the threads to prevent leaks.

Struggling to get a socket/adjustable spanner on it with it in situ

[buzzsaw]

pmanson said:

buzzsaw said:

pmanson said:

New switch has been delivered. Is there a way of getting the old one out without removing the swirl pot from the car / draining down the whole system?

When I changed mine I just unscrewed the old one and had the new one ready to put back in. Change it over quickly and you won't loose much coolant, then top up the swirl pot. Its also worthwhile wrapping some PTFE tape around the threads to prevent leaks.

Struggling to get a socket/adjustable spanner on it with it in situ

I think I used a ring ratchet spanner on mine

[buzzsaw]

pmanson said:

buzzsaw said:

pmanson said:

New switch has been delivered. Is there a way of getting the old one out without removing the swirl pot from the car / draining down the whole system?

When I changed mine I just unscrewed the old one and had the new one ready to put back in. Change it over quickly and you won't loose much coolant, then top up the swirl pot. Its also worthwhile wrapping some PTFE tape around the threads to prevent leaks.

Struggling to get a socket/adjustable spanner on it with it in situ

I think I used a ring ratchet spanner on mine