The heater fan works but my heater won't blow warm/hot air:
Refill and bleed cooling system as per manufacturer’s procedure. Start and run the vehicle at a fast idle and run up to normal operating temperature. Check for leaks. Check heater operation. Allow vehicle to cool and recheck cooling system level and coolant ratio, fill and/or alter coolant ratio as required.
If the heater fails to blow hot/warm air once the vehicle is up to operating temperature, there may be an air lock in the heater unit. Allow vehicle to cool, remove radiator cap, recheck cooling system level and coolant ratio, fill and/or alter coolant ratio as required. In the installation instructions it states “Please Note: Before connecting the hoses to the Y connectors, take a garden hose and run water through the heater hoses and heater assembly, make sure the shut off valve is fully open. This will help remove air from the system and stop air locks, this step must be carried out.”. If this step was not carried out it must be done at this stage.
Start and run the vehicle at a fast idle and run up to normal operating temperature. If the heater still fails to blow hot/warm air, Temporarily block off the top/inlet radiator hose at the radiator with a appropriate tool/clamp. Start and run vehicle up to operating temperature. Feel the outlet/lower hose from heater until it feels hot. The heater now should be blowing hot/warm air. Remove clamp from radiator hose. The heater should continue to blow hot/warm air. This procedure may have to be repeated a few times to remove air from system. Allow vehicle to cool, and recheck cooling system level and coolant ratio, fill and/or alter coolant ratio as required. Restart the vehicle and run up to operating temperature, recheck heater operation. Please note: Heater output will be limited at idle, all testing should be done at a fast idle.
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