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fluctuating water temp


BubbaTC

BubbaTC

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I had this prob when I first got the truck a month ago. I had to replace the radiator so I also replaced the WP and converted to electric fan. I also replaced all the hoses and thermostat. I still have the same prob. ive made sure that there is no air in the system. Its fluctuating between 180-220. I installed aftermarket gauges. It hasn't overheated on me but its kinda a little weird to me.
 


RonD

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My '94 4.0l had the same issue, it would go from under 1/2 on the temp gauge then up above 1/2 with no change in engine RPM or engine load.
Just randomly go up and down, never overheated, I too replaced several things.

Turned out to be the heater core, go figure.
On my '94 the heater core is the cooling system by-pass, if coolant flow is limited then temp fluctuates.
Heater core was $28 and 4 screws to remove, took 20min.
Benefit is heater is way HOT now, it was always warm, just real HOT now.
 
Last edited:
BubbaTC

BubbaTC

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Onalaska, Wa
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1984
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Ford
Engine Size
2.9L
Transmission
Manual
hmm I don't have any probs with heat, its plenty hot when I turn it up
 
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