Hot and Cold heater

[04MRADR]

:cool: I've noticed the past winter or so after the car heats up the heat pours out fine except when I come to a stop. The heater then blows cool air when I'm idling at a stop sigh or red light but when I start driving again its warm as it should be. My mechanic suggests its a problem with the heater control valve not working properly. The temperature gauge once warmed up never moves so doesn't appear to be a thermostat. Anyone ever have this problem and if so can you tell me what the problem might be ? And one other thing, I change my coolant every two summers. The first winter after the change of anti freeze it's not as bad. :cool:

[fastblackmerc]

First...
There is no heater control valve. Air temperature is controled by the blend door.

You need to properly bleed the cooling system.

[blackhueys]

I had same issue burped the cooling system fixed the no heat at idle.

[fastblackmerc]

Proper procedure to burp / bleed the Ford 4.6L cooling system:

http://www.reischeperformance.com/refill.html