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Old 05-09-2002, 03:34 PM
buggy boy buggy boy is offline
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i was sitting at the border crossing(canada/Maine) and i was idling 4 10 minutes and i looked down and saw that my temperature gauge was on 240!!!!! My eyes got big as saucers and turned the heat on and it cooled down. this is the first time i notice this. I cant figure what is wrong. I replaced the following parts 2 weeks ago:
Thermostat(195 F)
water pump
belts
hoses
flushed the radiator out

What can cause this. I replaced all of this at once. when i am drving, it stays at 195, but when it is idling 4 more then 5 minutes, the temperature increases. Could it be the clucthc fan and if so, how will i tell if it is bad? what else can cause this? Anything will help. I dont want my baby to blow up Thanks
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  #2  
Old 05-09-2002, 03:42 PM
Bob Barry Bob Barry is offline
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I'd vote for the fan clutch. If you can spin it easily by hand when it's cold (and the engine is off ), then it needs replacement. You might also have a medium-duty clutch; our trucks can generally use the extra airflow a heavy-duty unit provides, though sometimes we have to move up to the ridiculously-severe-duty units that are basically torque-coverter-sized units with a fan mounting-bolt pattern.

It could also be reduced water-flow from the pump, but that would be very unusual.
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Old 05-09-2002, 03:45 PM
rigger rigger is offline
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you flushed the rad but is it clean on the out side? on the rigs when the big cats run hot it means it's time to spray them down with a pressure washer clean the fins and it drops a good 20*C just an idea or maybe you have a bad thermostat try a new one they are cheap and a rebuild is not 240 is very bad . one other thing somone mentioned oil does alot for temp control how is your oil pressure? hope these help Ryan
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Old 05-09-2002, 05:09 PM
64Trvlr 64Trvlr is offline
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When you pressure wash the radiator wash it from the inside out. How is the coolant? What is the antifeeeze/water %? New radiator cap?
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  #5  
Old 05-09-2002, 10:16 PM
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OBX-AUTOMOTIVE OBX-AUTOMOTIVE is offline
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DO YOU HAVE A FAN SHROUD? COOL AIR IN HOT AIR OUT!!! [img]smile.gif[/img]
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  #6  
Old 05-10-2002, 01:26 AM
wcollier wcollier is offline
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Most likely Fan Clutch. Just went through the same thing with my 88 GW. Everything in the cooling system was brand new, with the exception of the fan/clutch (including the motor). My friend/mechanic tested it while the engine was running and fan spinning by lightly pressing against the fins (a bit risky, don't try this at honme . He was able to stop it easily... should not be able to do that obviously. It was clear the new clutch was moving much more air as soon as we started it up. Good Luck!
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Old 05-10-2002, 02:22 AM
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jode jode is offline
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One thing....watchit when you use the pressure washer, I hit mine withit once (from the insde out) and I ended up bending a whole ton of the fins. After pulling it and spending a few hours strainghtening them, it’s OK, but it will never be the same again. I also heard that having oil/sludge on the exterior of the engine could cause it to run hot, but that doesn’t fit your symptoms. How about the timing? Did you bump/move the distributor when replacing all those hoses? Bad timing can cause excessive heat bldup. It does sound like a fan prob though..
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Old 05-10-2002, 03:23 AM
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irbob irbob is offline
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Cool

Just another though for you is to check your coolant again. It may have had an air pocket in it and seamed to be full but now it could be low if the pocket releived itself. It happens.

Don't rule out a bad thermostat either if all else fails. Probably the clutch though as already stated.
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Old 05-10-2002, 04:50 AM
YAKFSHR YAKFSHR is offline
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after i shut the engine off, the fans keeps turning for a few monents. it this the way it suppose to be. all other cars i've had, when you shut off the engine the fan stops immediately.
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Old 05-10-2002, 05:17 AM
coolram coolram is offline
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That sounds even more like the fan clutch like everone else is suggesting.When you shut the engine off,especially if you driven /idled a good bit,the fan should stop almost immediatly,they do spin a little after but not very much.Also like RB said you could have a bad thermo(IMHO I like lower temp thermo...have 180 in mine).And cleaning outside makes a big differnence(jode I've had to straighten fins,bought a fin rake which mad it a little easier)
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Old 05-10-2002, 08:26 AM
Jeepzilla Jeepzilla is offline
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I'd check the belt tension to the water pump. This one does not tend to squeal when loose. High RPM ops get enough revs on the pump to move the coolant, but idling not so good.
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Old 05-10-2002, 05:04 PM
buggy boy buggy boy is offline
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thanks for all of ur imput. I will check out the fan clutch. the funny thing is i heard it working(heard the air flow) and then i didnt hear it as much. I will also clean the radiator. I ahve tightened the belts already because they r new and they do stretch a bit when new. I have all of the fan shroud on it. I mixed the coolant 50-50 like it mostly recommends, the same mixer i mixed it a year ago when i flushed it out then. i have gave it a tune-up when i replaced the thermostat, belt hoses and water pump. It has the original cap on it and i will replace that(havent yet). My only thought is the fan clutch because when i am moving 10 mph, it cools down but wehn i am at a dead stop, it heats up very slowly(after a minute) I also was told about an air pocket also and i havent checked that yet. Thanks for all of ur input. I dont want to cook my baby girl. She is all i've got that means alot to me. I will never get rid of her.
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1989 Grand Wagoneer--- Metalic Blue, AMC360/d44/727 All Stock. 174,000+ miles.<br />1971 VW Super Beetle--- 1600cc engine, autostick tranny, Saphire Blue, restored. All Stock. <br />1972 Olds Cutlass \'S\'--- 350rocket/TH350. Long term restoration that is a work in progress.<br />1970 Olds 442. Project car that is going to be a play-toy.<br />1987 Olds Cutlass Ciera 2.8L V-6 metallic blue. First car i own and restored. Very proud of it<br />1991 Mercury Sable. 3.0L V-6 Full-loaded. Sound running. Use as a winter car to preserve my other vehicles.
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  #13  
Old 05-10-2002, 05:10 PM
buggy boy buggy boy is offline
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also, the water pump i installed was a heavy-duty water pump
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