Rs2 overheating???

[Billman]

So today at 35 degrees Celsius and after a 2 hour trip I arrive home. Leave the car idle for a couple of minutes and see the temp rises high. The fan switches on and off in approx 40 seconds intervals.

I shut the engine off with the after run pump and after 1-2 minutes I start the engine again. The gauges show that and the fun runs in approx 40 sec intervals as before with the higher temps.

I believe my fan switch is shot. What is your opinion? Please note that when the aircon is on the fan runs all the time at tha 1st scale.

[domas]

i think the middle (92-93c) speed of fan is not worky, only a high speed (105c) and low speed as you mentioned
could be as simple as relay or a sensor. easy to test by jumping terminals on sensor pins on the radiator.

[Pirvu Eugen]

I think, in such high outside temp, is pretty normal.

[RoadKill]

mine gets higher than that works fine think its just down to the sender , the fan switch is in the rad

[domas]

btw what is your normal cruising temp?

[Billman]

I have an 82 degrees thermostat instead of the 88 that was used originally. On normal warm days 28-30 degrees outside I cruise with 85-88.

In the winter it is 80-82.

How should I jumper the cables?

[domas]

if the sensor is the same as in older cars, ie 3 pin

http://www.sjmautotechnik.com/trouble_shooting/cooling.html

scroll to the 8/10 of the page
2ND AND 3RD SPEED RADIATOR FAN TESTING

[Billman]

I have read it. Anyone know the original fan switch part number for the RS2?

[domas]

you have read it and what? have you performed any tests?

191959481C

[Billman]

I will perform them tomorrow before I buy a switch to check if the relays work.

Is there any test for the switch? Can I measure Ohm resistance or something else there?

[domas]

well, if shorting contacts does start the mid and fast fan speeds accordingly, and it does not happen when driving, then your sensor is shot.

[Pirvu Eugen]

I agree with Domas... But, take in consideration the fact that, the mfts wich is sending the signal for the gauge is in the exit from the head... And the termoswitch for the fan is in the lowest part of the radiator... Temperature difference is pretty big between these points.

[domas]

it is. the temperatures are still not normal IMHO.

[Billman]

I have never seen in the past that kind of temperatures.

[Pirvu Eugen]

Then, as Domas told you... Check the thermoswitch... Is pretty easy.
Goodluck!!