This is topic How To Troubleshoot NO HEAT in forum Tech Talk at Northern California Ford Owners .
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Posted by huttoboy (Member # 7813) on
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Summer a/c worked fine (still does)...but now no heat from dash. when I first select "heat" I get maybe 10-15 secs of warm air then it goes cold (this is at freeway speeds) so I would think the heater core is good....I was told that it might be the BLEND VALVE, but with the Cragen tech manual I have, I can't find any info on blend valve. I did replace the FAN in this summer....could I have done something wrong there. It was pretty straight forward, I bought the fan and housing from junk yard and replaced as a unit......TIA..wearing a big jacket, Hut!
Posted by huttoboy (Member # 7813) on
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SORRY SORRY......1989 LX 5.0 standard.
Posted by 68stanger (Member # 7842) on
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probally a cloged heater core. that happened to me before, motor was hot but no heat was coming through. what i did was pull both heater hoses from the fire wall, took a garden hose and alternated between the two core lines, doing that flushed out all kinds of stuff from the core.
Posted by Duncan Motors (Member # 7045) on
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thats a good point !.
Posted by 92stangLX (Member # 3252) on
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Check your thermostat. If it is stuck open your heater will be cold.
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