De mist test
The test is easy to do. Works from cold or hot.
1 Switch on ignition and start engine.
2 Switch air con off. Either a button in non climate control models or press the economy button. This switches air con off.
3 listen to engine at front. No fan should be running
4 switch on demist/aircon
5 listen at front. Slow speed fan should be running. It should continue to run and not cycle between fan and off.
Symptoms of resistor failure
Fan cycles between off and fast ( this is the usual symptom)
Or
No fan at all which could be motor too.
In the case of resistor failure over heating more likely as the high speed fan does not kick in until about 115 degrees if I recall correctly. Certainly way past when the slow speed would.
Chris
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