1994 GMC Jimmy overheating

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1994 GMC Jimmy overheating

Home > Discussion Forum > Mechanic's Corner - Engines

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All Messages in Thread	Author	Date
1994 GMC Jimmy overheating	Jenny	8-1-03
I just bought a Jimmy, as in yesterday. On the long drive home, 2 hours, it began overheating. I pulled over, checked the radiator and engine coolant, everything looked okay. Got back on the road. The car did fine at 50 mph. The gauge would show that I was overheating at 55. If I slowed down, the gauge went down, if I speed up, the gauge went up. I have never seen a car overheat and cool off so fast. Anyone have any suggestions? I'm hoping it's a bad thermostat.
Re: 1994 GMC Jimmy overheating	Sam Watson	8-1-03
I'd first check the fan clutch. At speeds above 55 your PU may be pushing a "bow wave" of air ahead of it, thus losing the ramming affect of air through the radiator. You can certainly hear the fan clutch engage as the fan then produces a definite roaring sound.Gauges are often not very accurate, do this, take a drive, run over 55, where the temp rises, and turn the heater on full, if you get average heat discharge from the heater, then the gauge isn't all that accurate. How long from a cold start does it take for the engine to reach normal indication on the gauge? If it comes up fairly quick and stays there at city traffic speed, then the thermostat is doing it's job.
Re: 1994 GMC Jimmy overheating	Chuck	8-4-03
Also, Sound slike you are :LOW on coolant... n
1994 gmc jimmy slt: the interior lights wont shut off	chris wrigley	4-15-08
I went to best buy shut the door and the interior light turned off. when i came back from best buy opened the door started the car and the lights wouldn't shut off. does anyone know why? and if so how can i fix it right now i have the fuse out so the interior lights r always off now
Re: 1994 GMC Jimmy overheating	Gary CC NV	8-1-03
Sounds like the thermostat is stuck half way open.
Re: 1994 GMC Jimmy overheating	Chuck	8-2-03
I know I know, This is a STRANGE one, BUT I have had it three times! Somone MIGHT have put the WRONG Fan (Direction) on your rig if it was ina front end accident and they used a smaller left over (junk yard ) fan, froma an engine that stun differant direction, Check that the FAN is PULLING air FRONT to rear.. and then of course... make sure your transmission was not overheating your RAD... from slipping.. at 55 and above what was your tach reading? It is easy to figure this one out.. ALSO IF you are WAY retarded (timming) it will cause syptoms like this, Also If you have a Vacume issue IE remeber when the state use dtpo put NOX systrems on earley cars and they HAD to put a warning about CRUSING at sustained speeds above 60 MPH RECAP Check FAN Direction. Check Timming, Check Vacume leak or mis set up Check Trans Check Oil Of course. I am going with Timming of FAN Direction.. a BACKWARDS fan would BLOCK air flow from speed.
Re: 1994 GMC Jimmy overheating	George S	8-4-03
I have the same symptons on my Rv with a 454. I haven't pursued it in depth, but I understand that the thermal fan clutch normally cuts off at high RPM. I also have a dual electric fan for my A/C that is mounted in front of the radiator pushing the air. If the thermal clutch overrides the heat at high RPM, could it not get enough air passing through the radiator to keep it cool? Especially with the retriction of air flow that the electric fans add.
Re: 1994 GMC Jimmy	Jodi Carpenter	6-27-06
Why does my engine fuse keep blowing?
Re: 1994 GMC Jimmy overheating	Sam Watson	8-5-03
The thermal fan clutch will disengage shortly after starting a cold engine, and will re-engage when it is subjected to air of around 220 degrees F. striking it. Of course, if there is insufficient airflow impacting on it,( due to obstruction, engine bay design, etc) then it will stay disengaged, no matter how hot the engine coolant has become.
Re: 1994 GMC Jimmy	Jodi	1-2-08
Why is my Jimmy overheating?