Question about 1998 Ford Taurus

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Defroster and heat aren't working

Heater core is fine. Radiator system has been flushed. New hoses, thermostat, switch and water pump. Why am I still not getting heat and my windows aren't defrosting?

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  • FrankB_in_PA Nov 17, 2008

    Seems like the same problem I've been working on my 1998 Taurus. Drained, cleaned, & flushed coolant system, and specifically flushed the heater core both directions until no gunk or sediment came out. Re-connected & refilled with coolant, but still no circulation through the heater core (outlet fitting is cool to lukewarm when inlet fitting is hot). There is a by-pass hose between the heater feed and return hoses that gets hot, as then does the heater return hose. Coolant temp gauge usually reads halfway between C and H. Where is electically operated valve that you say lets hot stuff flow through the heater core? I've been trying to find schematics on-line (free!), but no luck yet.

  • creekbird50 Dec 04, 2008

    We also have replaced everything in my heating system, new heating core and my thermostat keeps going to hot. We had to replace the bypass hose because it had a hole in it (this is the hose that has the high pressure hoses going into the heating core and the water pump and thermostat), but the thermostat keeps going to hot and blowing the resorvore bottle. We have put three new ones in the car. We also have had the system flushed three times. We put a new hot and cold switch in thinking that would help. I still do not have any hot air. What gives, please help me.

  • creekbird50 Dec 04, 2008

    OK, where is the matrix? There is 2 electrical connecstiuons coming out o the thermostat housing. Does either o these control the water flow threu the heater core?

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I don't know if you're still having the problem with your heat, but I had a similar problem. The first question is, do you have automatic climate control. If so, I can help you. When the pfroblem first started, all I would get was heat. Then eventually, I wouldn't get heat or cold. It would just blow outside air temp. After talking to a few people, I figured out that it was a part called the temperature control head. This unit detects the air temp in the car and adjusts the air temp/fan speed according to the need. Apparently, it's a common problem on Taurus's with this feature. The part is about $150.00. The repair requires a partial tear down of the dash. If you had a repair shop do it, you can count on about 2 HRS labor. Of course, this only helps if you have climate control. Good luck!

Posted on Dec 11, 2008

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Hi from uk when engine temp is hot and heat set on max openhood and physically feel both heater hoses for temps ? if one is hot/warm and other cool ? then coolant is not circulating thro the heater matrix(radiator) as you have renewed most parts suspect without success? may i suggest your actual circulation thro the matrix is most likely to be the heater coolant valve which is elec operated as you turn the heat selector in dash both heater hoses connect to this for open/close to matrix of coolant so if valve is failed it is not servicable ? and not to difficult to locate if you follow h/hoses to heater ensure there is power to the actual valve b4 you consider replacing valve easy diy and not too expensive ? hope this helps you ?

Posted on Nov 10, 2008

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SOURCE: heater and defroster cold

Sounds like a circulation problem could be the thermostat or a water pump issue, Ive had a similar problem on my Ford Taruas a couple of years ago. I replaced the thermostat and the problem was still there,so I replaced my water pump later. During my inspection of the old pump after removal I had noticed a few of the fins on the internal part of the pump were missing. This probably didnt allow the pump to circulate the coolant fast enough through the system. After replacing the pump and thermostat my problem went away, I hope this helps.

George.

Posted on Nov 27, 2008

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