89 f150 overheating...STILL!!!

Asked by Aug 22, 2016 at 07:41 PM about the 1989 Ford F-150

Question type: Maintenance & Repair

I'm hoping somebody can help me
cause I'm out of ideas. My f150 302 5.0
v8 is overheating and overflow boils
over. I strtd out with a new thermostat
with no luck. Then I replaced the water
pump...at first I thought that fixed
it...but it didnt. Guess I just wasn't
running long enough. Now I replaced
the radiator cap and when I got home
last night and shut it off I heard the
overflowbubbling over yet again! I
should also add that the heater isn't
working either. What could it be that
would cause the overheating and not
having any heat?

4 Answers


Have you checked the coolant flow in both the radiator and the heater core? In a truck this old it is highly possible that they are both restricted.


Hmm, 1989 is 27 going on 28 years.... I hope it's not your internal water jackets..... That would be really bad.... have you considered retirement ??


Try doing a system flush and check ur cooling fan, the clutch might be weak and not blowing enough air

Did you figure it out? I'm having the same problem. And I have a new radiator thermostat water pump engine.

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