Insufficient Heating

Insufficient Heating

Possible Source(s):
- Coolant flow valve stuck 'closed'
- Coolant flow valve stuck 'open' allowing recirculation of coolant at engine idle

Action(s) to take:
- Renew valve

Possible Source(s):
- Motorized in-car aspirator seized

Action(s) to take:
- Renew aspirator

Possible Source(s):
- Cool air bypass damper stuck open

Action(s) to take:
- Renew, check fault code #43

Possible Source(s):
- Blocked air inlet/pollen filter

Action(s) to take:
- Check/clean/renew

Possible Source(s):
- Blower speed low

Action(s) to take:
- Check performance range

Possible Source(s):
- Low coolant level

Action(s) to take:
- Adjust as required (verify and correct reason for loss)

Possible Source(s):
- Engine thermostat faulty

Action(s) to take:
- Check engine running temperature

Possible Source(s):
- Heater water pump seized

Action(s) to take:
- Check operation

Possible Source(s):
- Heater matrix blocked

Action(s) to take:
- Renew matrix

Possible Source(s):
- Heater circuit air-lock

Action(s) to take:
- Perform Cooling System fill/bleed procedure.