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Hi my alfa 147 will blow only cold air,does anyone have an idea what could be the problem.the fan runs but no heat..
 
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how is the temperature guage? have you checked the coolant reservoir for fluid? there could be an air lock in the heater matrix due to lack of fluid.
 

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Check whether the pipes in the engine compartment going to the heater are getting warm.....if they are and you are getting no flow through the matrix, its possible that the motorized valve on the heater body is malfunctioning. They are replaceable with a bit of a fiddle - held onto the heater body with small torx screws IIRC.....Trouble is there are 3 motorized operators, and I can't remember which one controls the water valve.........I imagine its one on the left-hand side of the car, as that's where the water pipes enter the heater....
 
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