Hay88 - my Ford KA (54 reg) heater always blows hot air even when set to cold. Somebody mentioned it could be that the heater control valve has broken. Sits under the plastic at the back of the engine bay apparently - what do you reckon?
The most common cause of the 'stuck on hot' was the heater matrix bypass valve.
Beneath the scuttle panel you'll see the 2 water pipes going through the bulkhead into the cabin, just before they go inside there is a valve assembly with 4 water pipes and a small motor (2 pin plug).
when signaled the motor diverts the hot water away from the heater box and back to the engine. When heat is required the valve reopens to allow hot water to circulate around the matrix.
The system is controled by electronics built into the main heater panel i think so it's best to have it checked properly.
hay88
March 2010
Heater control valve stuck open. It's a known design "problem" with Ka's. They're not bad little cars, otherwise: loads of fun to drive
hay88
March 2010
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