[smokin_944]

How to test cooling fan relay
1. Remove the Cooling Fan Relay.

2. Take resistance readings on the relay as follows:

Terminals "A" to "B" - Reading should be infinite (i.e. open circuit)

Terminals "30" to "87" - Reading should be infinite (i.e. open circuit)

3. Connect a 12 VDC power supply across terminals "85" and "86". You should hear the relay click when you connect the power supply.

4. With the power supply connected to the relay, take resistance readings on the relay as follows:

Terminals "A" to "B" - Reading should be zero (i.e. short circuit)

Terminals "30" to "87" - Reading should be zero (i.e. short circuit)

5. If any of the resistance readings taken above are bad, the relay is bad and should be replaced.