Me again.....unfortunately!
So, i've had it wrong all along. It's not the Low Speed fan that's the problem, it's the HIGH SPEED FAN that is not switching on - hence overheating in traffic only! I've bridge the 3 connector points on the Thermo Sensor Switch and only the low fan switches on, not the high speed fan. When bridging these points i can hear the relay click for the low but not for the high - from what i've read on the interweb it means no power is being sent to the high speed relay as if there was i shouldve heard a clicking sound - I'll replace the high speed relay in any case if i don't get any help here, but i dont think it is the relay (i could be wrong).
Any suggestions guys? Help? Auto Electrician you can recommend in Cape Town?
Some info on the two speed fan:
The aux fan serves two purposes. It forces air through the engine coolant radiator and automatically turns on at a low speed if the temperature of the coolant rises above a certain level. If that is insufficient to dissipate the heat being generated by the engine the fan speed increases if a higher temperature threshold is exceeded. The second purpose of the aux fan is to force air through the air conditioning condenser (mated to the engine coolant radiator) when the air conditioning system ("snowflake" button) is on.
Most people don't give the aux fan much thought. When it turns on at low speed it's practically inaudible, and as long as the engine driven fan is doing half a job in temperate conditions while the car is moving the coolant rarely reaches a high enough temperature to turn it on in the first place.
