No Heat !?
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New User
Joined: Sep 2006
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No Heat !?
I've got a '92 F150 Nite with a 351w, but no heat ! No heater core or rad. problems, t stat is great, blend door fine, water pump is fairly new but flow could be better from it. Dealer and two mechs. can't figure out problem. Any suggestions ? Much appreciated, Gordo
Elder User
Joined: Aug 2007
Posts: 502
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Tap into the heater water line with a low pressure gage check water pump pressure.Should be 15psi@3000rpm.Next i would shoot the lower radiator upper radiator hose with infared.You want a 20deg split then shoot the heater hoses.If all ok then make sure the thermostat isnt by passing inside where it seats.Is the fan turning the right way? just kidding
