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Tractor Talk Discussion Forum

pickup overheating

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Lee in Iowa

04-20-2008 18:23:32




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I've got an 89 chevy pickup. The othe day it overheated because the fan clutch quit. Installed new fan clutch and thermostat. Now if you let it sit and run without radiatior cap temp stays normal operating temp. If you put the cap on the temp goes to about 225 but comes back down. I tried a different cap from a pickup that was working ok and it still did the same thing, up and down like a yoyo. Checked overflow tube its not plugged. I think the gauge is working it came up when it overheated. Any ideas? Thanks, Lee

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jvickerd

04-23-2008 17:56:01




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 Re: pickup overheating in reply to Lee in Iowa, 04-20-2008 18:23:32  
HI LEE

IT MAY BE POSSIBLE THE THERMOSTAT IS BREAKING IN BUT HOWEVER THE RAD CAP SHOULDN'T MAKE THAT MUCH OF A DIFFERENCE,

PLEAS CHECK YOUR OVERFLOW TANK TO MAKE SURE THAT THER ISN'T ANY BUBBLES COMING FROM NOWHERE IN THE TANK.

THIS NOWHERE MEANS A POSSIBLE HEAD GASKET BLOWEN.

HOW MUCH OF A MIX OF ANTI-FREEZE TO WATER DO YOU HAVE IN THE RAD?



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Goose

04-21-2008 06:34:39




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 Re: pickup overheating in reply to Lee in Iowa, 04-20-2008 18:23:32  
Are you sure you got the right fan clutch? My '89 with the 5.7 has the direction reversed on the water pump/fan. Like someone else said, it cam about when they went to the serpentine belt.



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frankiee

04-21-2008 04:30:16




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 Was fan replace with the clutch? in reply to Lee in Iowa, 04-20-2008 18:23:32  

Not likely your case because you said you changed the clutch and the stat.
You did not say you changed the fan blades, but I thought I would tell you what happened to me once
I put a used fan off a 89 (If I recall right) on to an 88 350 Suburban. It looked all right.
Temp bounced up and down.
It was the fan blade pitch. They changed direction in that one year.
Took the fan off the clutch and put the proper fan on and it was good.
Far as I remember, that was when they went from multiple v-belts to the surpintine belt.
It would be something to look at if you did put a different fan on.

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davediehl@hotmail.com

04-20-2008 21:01:00




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 Re: pickup overheating in reply to Lee in Iowa, 04-20-2008 18:23:32  
Better look at replacing the thermostat. OEM replacement is the only way to go, they are reasonable and more reliable than aftermarkets. Unless you have a head gasket leaking or a water pump failure, that is about the only thing it could be if the fan is now running. With the cap off, I would believe its probably not going to be a head gasket. With no pressure on the cooling system, one would see lots bubbles and discoloration somewhere. I'd change the stat and flush and fill with new coolant.

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Bob

04-20-2008 19:55:35




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 Re: pickup overheating in reply to Lee in Iowa, 04-20-2008 18:23:32  
1. Did you install the themostat "right side up"?

2. Have you put enough miles on it to work ALL the air out of the cooling system?



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Lee in Iowa

04-20-2008 21:08:08




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 Re: pickup overheating in reply to Bob, 04-20-2008 19:55:35  
Pretty sure I got it right side up. Drove it ten miles plus probably ran an hour sitting still burning that 3.66 gas. Lee



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Lee in Iowa

04-20-2008 19:32:30




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 Re: pickup overheating in reply to Lee in Iowa, 04-20-2008 18:23:32  
I called a friend of mine that works at a GM dealership to bring me the parts because I've also had trouble with aftermarket t'stats, but he brought me a napa one. I'll have to call him back and chew him out usually he's gungho about staying all gm. If that's not it I'll have to check the head gaskets, but I don't think its getting into the oil or going out the pipe. Thanks again, Lee.



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El Toro

04-21-2008 04:11:00




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 Re: pickup overheating in reply to Lee in Iowa, 04-20-2008 19:32:30  
You need to hold your hand near the outside of the radiator to see if its hot all over or is cool in some areas when its overheating. Your radiator's tubes may be blocked and needs to be rodded out. Hal



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trucker40

04-20-2008 19:22:22




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 Re: pickup overheating in reply to Lee in Iowa, 04-20-2008 18:23:32  
Thermostat might be sticking.May have a blown headgasket.Is it loosing water?Is the oil getting water in it?I put a thermostat in my 1988 Chevy 1500 with 305 engine from a auto parts store and it would overheat until I put an original one in.They looked a lot different.Its been a couple of years ago but it seems like it goes in different too.Like maybe the spring is on top,or it has a spring on top and bottom,be sure and ask how it goes in.Another thing it might be is if your upper radiator hose had a spring in it and it disintegrated or you lost it out of the hose it could be collapsing.I made kind of a spring out of a coat hanger a while back and fixed a hose like that,I think it was on that pickup as well.You can buy a hose that has a spring made into it,never had any trouble with the ones like that.
Sometimes it doesnt take a lot to blow a headgasket,especially if it got real hot.

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jvickerd

04-20-2008 19:02:45




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 Re: pickup overheating in reply to Lee in Iowa, 04-20-2008 18:23:32  
Hi.
What size of engine in your pkp?



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Lee in Iowa

04-20-2008 19:18:24




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 Re: pickup overheating in reply to jvickerd, 04-20-2008 19:02:45  
Its a 350 with vortec heads and throttle body fuel injection. Lee



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thurlow

04-20-2008 18:37:36




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 Re: pickup overheating in reply to Lee in Iowa, 04-20-2008 18:23:32  
Don"t know about the Chevy, but some Dodges would do exactly what you"re describing when using an aftermarket.....rather than Dodge/Cummins..... ... thermostat.



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