Only one fan working. What to check
Discussion
There are two temperature sensors one under throttle body No2 which give the dash display temperature the other under throttle body No 5 which goes to the engine ECU and controls the cooling fans:-
Quiet often the display sensor reads higher than the ECU one which regarded as the more accurate one. To check the ECU value you will need the diagnostic software and lead.
Quiet often the display sensor reads higher than the ECU one which regarded as the more accurate one. To check the ECU value you will need the diagnostic software and lead.
As others have said, likely a bad Pod sensor or corrosion on the connector which is separate from the ECU sensor. The ECU sensor is what drives the fan control. You can check the fan control function by pulling the connector on the ECU sensor. As a failsafe, both fans should come on immediately. It'll be worth cleaning the connectors up on both sensors as corrosion on them will affect resistance which will lead to false readings.
Whilst you're there, you definitely need to check the electrical connectors on the fans. They're not waterproof connectors and they do corrode and stop working. Pulling the plugs, cleaning up the connectors inside and sealing them up with a bit of silicon is a good preventative maintenance step.
Whilst you're there, you definitely need to check the electrical connectors on the fans. They're not waterproof connectors and they do corrode and stop working. Pulling the plugs, cleaning up the connectors inside and sealing them up with a bit of silicon is a good preventative maintenance step.
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