rad fan switch

[barrington]

can any one tell me what temp the fan switches on at as i have a n ajustustable thermostat control to fit as one in rad has been soldered in cheers

[TVRleigh(BBWR)]

Anything from 85-95.

[barrington]

cheers i can start playing now

[ed_crouch]

What youre looking for is the car to get up to 90degrees on the gauge, then the fan comes on, and the temperature should FALL to about 85 or so, then the fan cuts out. Repeat!

If the fan cant reduce the engine temp with the car stationary on a hot day (whats one of them then?!?), then you will have problems. Mine is bog standard and has no problems. If the fuelling and/or ignition are skewiff, it can cause the engine to overheat, so its worth checking these before condemning the whole cooling system.

Ed.

[barrington]

fan runs all the time did some checks and found the gone but the problem is you cant take it out of the rad becourse it is soldered in and i dont want to nacker the rad

[GreenV8S]

Should be screwed into a boss (which is then soldered into the rad). I very much doubt you could solder the otter switch directly to the rad without wrecking it.

[leorest]

I assume your "adjustable thermostat control" uses a sensor which is mounted in a different (thermal) part of the coolant circuit to the original otter switch, so all bets are off even assuming that everything is correctly calibrated, which is unlikely.
Assuming the instrument temp gauge is good (big leap of faith) then set the control for maximum temp and start engine from cold. Watch carefully and don't get distracted, when the temp is slightly above normal running temp slowly turn the adjustment until the fan cuts in. Now observe what temperatures the fan cuts in/out at and fine tune if necessary.

Notice the judicious use of the "Ass..." word

[barrington]

cheers for the help chaps i did take out the passenger head light pod to get to the switch took the clip off and you can see were it has been soldered in also one of the plumbers at has a temp gauge that straps to the pipe for a correct temp

[barrington]

barrington said:

cheers for the help chaps i did take out the passenger head light pod to get to the switch took the clip off and you can see were it has been soldered in also one of the plumbers at work has a temp gauge that straps to the pipe for a correct temp

[TVRleigh(BBWR)]

On my old Rad, there was a socket and the otter switch was just a press fit. held in with the clip.
I think as both sides are copper it would be posible to solder in it with a plumbers blow torch.

Aslo the temp. can vary depending on where you are fitting the probe.

Maplins do a cool temp. gun for £30 handy for working out where to put it, and a more acurate reading.