have noticed that with engine running for some time the thermo fan is not cutting in, have run wire from fan plug to battery & fan works, also engine idle has a little intermited miss. can anyone please give me advice as want to get cooling system working proporly before summer hits, thanks ran.

Thermo fan will not cut in until...memory failure. Coolant temp of 104-5 degrees (roughly)
Will cut out again at 98 (approx).
Fan relays like to fail.

i have the same problem and it drives me insane i just cant work out what is causing this malfunction, any help would be appreciated. i have considered just going directly to the battery via a toggle switch. is this a good idea?

Hey there.
Again, the fan will only cut in whne the engine is hot enough.
When I used to test them it involved 5mins of above idle reving to generate enough coolant temp to engage the fans.
Is the car over heating?
Running a toggle switch is not such a good idea...the engine will not run at the correct temperature possibly causing fueling issues, to name a few. Add to that you simply forget to switch it on!! Enough said.