Question about 1999 Ford Taurus

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99 Taurus 3.0 Heater problem

No heat at idle. After I get up to highway speed I get heat, when I slow down it blows cool. Have flushed, changed thermostat, changed pressure tank (it had a crack and was leaking) w/new cap. Doesn't over heat so I'm assuming the water pump is working, although some one has suggested that might be the problem. Also have notice that the radiator cooling fans seem to come on quickly, only 2 - 3 minutes after starting engine. I am no losing any coolant. Have seem on this site about changing the Temp Control Valve. Where is that located if that might be the problem?
Thanks, its starting to get chilly here in Wisconsin in the mornings!!!!!!!!!!!

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  • ptrbtr Sep 29, 2008

    Sounds reasonable to me, it definitely would make sense that the circulation is an issue and at higher RPM's the coolant would flow faster and deliver more heat.
    Will try it tomorrow

  • ptrbtr Oct 04, 2008

    Did what you said to do and now have more heat than I've had in years. It must have slowly plugged up and I didn't notice the slight difference in temp. I couldn't get directly to the heater core so I pulled off the hose from the water pump that goes to the outlet on the core. I back flushed it both ways because the hose T's off and makes a complete loop. It did add water to the system but I just drained the watered down antifreeze from the radiator and added more to get the 50/50 mix needed.
    Thanks you have saved me hundreds of dollars and hours in a shop!!!!!!!!!!!!!!!!!!!!!!!!!!!!!



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You may need to remove the hoses from the heater core inlet an outlet and flush it directly, I saw these get plugged up on many cars like yours while I was a Ford technician, direct flush of the core cured the issue.

Posted on Sep 29, 2008


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