Question about 1990 Ford F150

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I have a 1990 ford f150 v8 302 no heat

I replaced the radiator, thermastat, water pump and replaced freeze plugs still no heat what is the problem now. I also put 50/50 in and flushed the whole system please help

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  • wranglerman1 Feb 19, 2009

    I also replaced heater core

  • wranglerman1 Feb 19, 2009

    tried all suggestions still not working if there is any thing else please tell me I will try anything at this point. the door closes under the hood by vaccume and the door on the inside is done manually checked those already and they close. when I move switches and I hear eveything open and close and my ac works fine



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After reading what you say;;;there are only two more options left;;;1 check your oil cooler at the very front of radiator is it blocked {probly needs power hosed from a 3 mtr distance.2 the small matrix heater radiator low down the dash [bottom of dash ]can be very hard to remove.that it find the blockege in these two and your problem is solved.good luck please let me know how you get on .adrian

Posted on Feb 19, 2009

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Check vacuum hoses that connect to heater valve on passenger side under the hood ,

Posted on Feb 19, 2009

  • c38hot Feb 19, 2009

    apply vacuum to heater valve and observe , not the doors , valve controls flow of hot coolant


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I would have to assume that the water has heated up,, but there is also a valve in the heater hose, at the firewall that opens when you turn the temp knob. if the hose going to the firewall is hot, and you are not getting heat inside, the valve is not opening. It can be mechanical or electrical. Not sure about yours.

Posted on Feb 19, 2009

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