Models: S Type 2002.5 to 2008
Symptom: Heaters only blowing hot
Cause: various faults on the heater
- Remove passenger side dash end panel and locate connector FC4 (14-way green connector.)
- Disconnect the connector and on the male side, measure the resistance between pin 9 Brown/Green and Pin 10 Brown/White (On a good Circuit you should have 30 ohms)
- If you do not have 30 Ohms, go to the heater valve and measure the resistance across pin 3 Brown/White and Pin 1 Brown/Green of the heater valve – this should be 30 Ohms – if open circuit replace valve and recheck operation.
- If you have 30 Ohms across pin 1 and 3 of the heater valve check wiring integrity from connector FC4 Pin 9 (Brown/Green) to Pin 1 of heater valve and FC4 Pin 10 (Brown/White) to heater valve pin 2 If open or short circuit repair as necessary.
- Reconnect connector FC4 (14-way Green) and measure the voltage on pin 9 and 10, when the climate control is set to hot you should have battery voltage on both pins and when set to cold you should have ground on both pins.
- If you do not have battery voltage check pin 2 Yellow of heater valve – this should be permanent battery voltage, this is fed from fuse 32 (10a) in the engine bay fuse box
- If pin 9 and 10 do not switch to ground, suspect an internal control module fault. NOTE: Do not fit another control module until the heater valve has been replaced, as sticking heater valves are the main cause of module failure.
- Petrol Models – On right hand side of radiator under expansion tank
- Diesel Models – In right hand front wheel arch liner in bumper corner
Climate Control Module
- Navigation Models – Remote climate control module located above glove box secured to dashboard, glove box requires removal for access.
- Non Navigation models – Module is the Control panel located above the radio in the centre console.
Courtesy of Autologic: www.autologic.com