Hello, hello, hello everyone! I am new to this forum and hope to find some good insight and guidance about issues with my 1994 Flareside 4.9L. I bought the truck with 287K miles on it and now have almost 309K. I researched for months before buying this truck as I wanted a reliable engine and minimal problems. I will post a pic some time soon. I assume that my truck is sort of rare as it is a greenish-blue color. Anyway, I just replaced the radiator today trying to get some heat to work. My heater core lines were warm but not hot. Now they are nice and toasty. Yet when I turn on the heat/def, I get nothing but cold air and I can see the hvac lines sweating. I did notice that the temp **** seems tight part of the turn and then loose the rest of the way. But, That is all I have found. A/C works great but it is winter time and I need heat. The last 2 years I have used a portable propane heater which works really well but propane is expensive. Any help?

 

Welcome.
Suggest you post your questions in the ( 1987 - 1996 F150 ) section of the site..
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Welcome. Have you replaced the thermostat? It is possible the heater core is partially clogged, you could try to flush it out.