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Old 12-29-2006, 15:41   #1 (permalink)
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Heater Issues

1990 Taurus 3.0. Recently replaced temperature sensor, thermostat and flushed and filled coolant system and had no problems for about two months. Now the car will only blow cold air. Car runs fine otherwise. Temperature gauge shows normal operating temp but the air coming out is cold regardless of where the selector nob is positioned. Any suggestions?
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Old 01-02-2007, 01:48   #2 (permalink)
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Re: Heater Issues

It will either be the heater core or the heat box door not opening. I think that door is vacuum operated and should be pretty easy to fix. Start the car and let it warm up, turn heat on high for a few minutes and then feel of the 2 heater hoses going into the firewall, if both are hot or real close to same temp then it will rule out the heater core.

Another thing people dont understand is they use a chemical solution to flush out their cooling systems (not saying that you did) which will clean em alright...Where do you think all that rust/gunk goes, it collects in the heater core and the radiator and will sometimes result in a big clog. Radiators can be rodded out but heater cores are pretty much disposable, ther tubes are too small to rod out. Hope this helps.
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Old 01-02-2007, 19:33   #3 (permalink)
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Re: Heater Issues

I haven't used a chemical. When I flushed the system I just used water from a garden hose. I was thinking of using a chemical this time but I think what I will try first is switching the two hoses on the heater core so the coolant runs through it the opposite way. I'm hoping this might help to clear it out. The hose coming out of the heater core is definitely colder than the one going in so I'm pretty confident that thats my problem.
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Old 01-04-2007, 19:48   #4 (permalink)
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Re: Heater Issues

Well, after quite a bit of trial and error, I've concluded that the water pump is faulty. The car doesn't overheat which baffles me but I disconnected the lines from the heater core and started the car. After allowing it to idle for about 15 minutes, I still had not had any coolant flowing out of the heater core hoses. I'm going to have to decide if I want to do this myself or not. It definitely looks like it would be a PIA to change.
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