I've moved my discussion into a separate thread from http://www.astra-mk2.com/forum/forum...2-fuse-diagram
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Diagnosing radiator fan won't start
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Currently the Radiator has stopped kicking in and bypassing the thermal switch does not activate it. Will check fuse next.
I powered directly the fan off the battery and it spins up nicely. I need to check the thermal switch output with a multimeter to verify the resistance at temperature. The fan was working fine a couple of weeks ago.
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With a multimeter I can see that the path from ground (-ve) to the fan is intact and there is continuity.
With the connector that goes into the fan(not the connector coming out of the fan) there are two terminals. One is from the thermal switch and I believe the other should be 12v. However with the ignition on and the multimeter set to 20V I cannot get and potential between the 12v terminal and the -ve of the battery. I will repeat this test again in case I have made a mistake.
The horn is working which shows that +ve is coming in to the top of the circuit and the fuse is not failed.
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Here are some pictures. I phrased wrongly in the above. Instead of "... there are two terminals." "I cannot get and potential between the 12v terminal and the -ve of the battery." I meant "...there is a socket with two connections." "I cannot see any potential between the 12v connection of the socket and the -ve terminal of the battery." (The socket is in the second image)
The thermal switch connector with Gnd identified:
The socket for the radiator:
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Some progress.....
With the airbox out I took a closer look: I could see some bare wires in the coolant switch wiring and then noticed the wire is 'crunchy' .
The plan is to replace the wiring and connector to the point where it comes out the main wiring loom bundle.
Is the thermal switch connector an EV1 connector? It looks like it is? Says AMP on it which presumably stands for AMPHENOL.
I had what I thought was an EV1 connector but it didnt fit for some reason.
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H286 just revisiting your photos from jan 2020 (eeeeek) and got myself a bit confused
your photo of the minitimer with GND written on it is for the ECU temperature sender (in the thermostat housing)
the radiator has its own thermister screwed into the end of the rad, at the battery end, and plugs into a beefy waterproof plug somewhere between the battery and the headlight.
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