Engine Temperature Issue - Ford Powerstroke Diesel Forum
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post #1 of 2 Old 04-08-2013, 08:04 AM Thread Starter
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Engine Temperature Issue

My truck has been disabled due to a huge HPOP oil leak for about two months. It is offseason for racing, so thankfully I have not needed the truck. I had time to fix the leak on Saturday only to leave it with a small fuel leak.

When I parked the truck there were no temperature issues. The truck would sit on the "R" in NORMAL or down on the "O" if I was babying it. My first test drive after fixing the oil leak resulted in temps around the "L". This was unusual, but I did have my car hauler hooked up. I had a car on the hauler on Sunday and the temps were past the "L" but still under the red marker and "H". Also, the needle has a tendance to "dance". It will jump from the "L" to about half way between "L" and "H" and slowly creep back down.

The only outstanding circumstances are that the water pump seemed to be leaking last summer. I wasn't sure if it was the neck on top or the weep hole that was leaking. I changed the entire neck, thermostat and oring. The leak from the neck stopped, and I would have the occasional leak from the pump still. I top my coolant supply and add additive (and test) as necessary. After the neck/coolant change the truck temps were fine.

My inclination is to replace the water pump. I'm wondering what you guys think. Should I change the sender first in case it is bad? Ideas?

Thanks in advance.


1996 7.3l, bone stock tow rig -----1991 Miata, 327 cu in SBC, 331 rwhp, 419 ftlb torque, Muncie 4sp

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post #2 of 2 Old 04-12-2013, 01:41 AM
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An occasional leak from the water pump sounds like the water pump is going out. It's not unusual for a faultering pump to leak intermittently, probably because of a seal sometimes holding and sometimes not. I would change it before it leaves you on the road somewhere.

If the gauge is moving around, it sounds like a loose fitting. Or, it could otherwise be going out. If you have an infrared temperature gun, I would check the top radiator hose when the gauge seems to be indicating a near-overheat. If the hose is showing around 200F or 220F, it seems the gauge is reading too high for some reason. I'd wiggle the wires and if no improvement, change the sender.

If you had an old thermostat, I'd recommending you changing that. However, yours is relatively fresh, so is less likely to be a problem.
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