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Wierd Overheat Issue
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Wierd Overheat Issue
Hi, all:
I'm hoping maybe someone has an idea here. We have a 1999 F-150 with about 75K. 6 cyl, manual, a/c, and the typical power options. It has an intermittent overheat for which we can't pinpoint a cause. Every week or so, with no warning, the temp gauge will climb near H. So, if we can't pull over, we take the steps of turning off the A/C and turning on the heat and rolling down the windows and this brings the temp down to normal.
In this circumstance, once parked and allowed to sit for an hour, it restarts and runs like nothing was ever wrong. It runs completely normally for another week or so and then does this trick again.
We changed out the 'stat. That did nothing. Anybody else have any thoughts?
I'm hoping maybe someone has an idea here. We have a 1999 F-150 with about 75K. 6 cyl, manual, a/c, and the typical power options. It has an intermittent overheat for which we can't pinpoint a cause. Every week or so, with no warning, the temp gauge will climb near H. So, if we can't pull over, we take the steps of turning off the A/C and turning on the heat and rolling down the windows and this brings the temp down to normal.
In this circumstance, once parked and allowed to sit for an hour, it restarts and runs like nothing was ever wrong. It runs completely normally for another week or so and then does this trick again.
We changed out the 'stat. That did nothing. Anybody else have any thoughts?
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Response on cooling issue...
Coolant looks good and was replaced within past 6 months
While I have not noted boil over or coolant shooting out of hoses or the resivoir, the engigine heat on the gauge will noticably decrease when A/C turned off and/or heater turned on. I realizr this proves nothing, but I also don't see clear evidence of gauge malfunction either.
Oil looks good (no indication of non-oil contamination) and engine runs well at this time.
While I have not noted boil over or coolant shooting out of hoses or the resivoir, the engigine heat on the gauge will noticably decrease when A/C turned off and/or heater turned on. I realizr this proves nothing, but I also don't see clear evidence of gauge malfunction either.
Oil looks good (no indication of non-oil contamination) and engine runs well at this time.
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I'd start with the easy stuff first - gauge and sender.
The gauge in these trucks is hardly better than an idiot light. You may want to verify the temps with a thermometer or infrared temp probe.
I use a little digital thermometer
that I got from Fry's for like $10. It's for BBQ or something, but it's got a needle probe that slips nicely between the fins on the radiator.
Not perfect, but close enough.
The gauge in these trucks is hardly better than an idiot light. You may want to verify the temps with a thermometer or infrared temp probe.
I use a little digital thermometer
that I got from Fry's for like $10. It's for BBQ or something, but it's got a needle probe that slips nicely between the fins on the radiator.
Not perfect, but close enough.
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From: Florence,SC
the way i see it, if turning the heat on makes the problem go away then it is not a gauge or sender. with the truck hot, stick your hand behind the upper hose right at the thermostat and check airflow. if you have poor airflow try a clutch
