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Discussion Starter #1
i have an 85 runner which i just installed a new 3row radiator in about 3 weeks ago along with a new thermostat. it ran fine until 2 days ago, whenever i drive it for mor than 5 miles is starts to heat up, there is plenty of coolant in it. im stumped, please help
 

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<FONT COLOR="Red"> If it started doing this suddenly, then check the thermostat for proper operation.

Were you having over heating problems before the new pieces were installed??
</FONT c>
 

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What Slick said, I've had 2 new thermostats start sticking soon after being installed. The quage would go way up, stay there for a short time, then drop back to normal.
 

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get a double stage thermo, thats what i ended up doing, i dont know the part number, but someone on the net has it i want to say its on 4crawlr site but i could be wrong
ther actualy app is like 83 or 84 truck.
 

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with a new rad and since you said it was ok for a few days I would take a look and check your thermostat and I would not trust the temp guage either mine showed the temp as being good but was actually overheating so I put an autometer water temp guage and sure enough my factory guage was wrong.
 

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Discussion Starter #6
i have also recently installed a new thermo too, i was experimenting with it today and from what i could see, it seems like there is a pressure build-up somewhere along the way, and all my coolant is gradually spewing out the overflow resevior. i flushed out the system and drove around for a few miles and it looked like it was starting to heat up so i pulled over and filled the radiator back up and i drove it around a few more miles and i didnt seem to heat up, ill see what happens tomorrow. bye the way, how do u get it to show your stats or whatever at the bottom of your post?
 

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Originally posted by 85TrailToy:
<STRONG>What Slick said, I've had 2 new thermostats start sticking soon after being installed. The quage would go way up, stay there for a short time, then drop back to normal.</STRONG>
mine dose the same thing.is that a problum
<IMG SRC="smilies/usa.gif" border="0"> <IMG SRC="smilies/usa.gif" border="0">
 

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my 85 pick up did the same thing, the coolant passages in the head rotted out into the combustion camber and it pressurized the radiator pushig the coolant out. had the head welded and now its fine <IMG SRC="smilies/bounce2.gif" border="0"> <IMG SRC="smilies/bounce.gif" border="0">
 

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Matt Cole 85runner --- time to replace the head gasket.
 

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Originally posted by Matt Cole 85runner:
<STRONG>i have also recently installed a new thermo too, i was experimenting with it today and from what i could see, it seems like there is a pressure build-up somewhere along the way, and all my coolant is gradually spewing out the overflow resevior. i flushed out the system and drove around for a few miles and it looked like it was starting to heat up so i pulled over and filled the radiator back up and i drove it around a few more miles and i didnt seem to heat up, ill see what happens tomorrow. bye the way, how do u get it to show your stats or whatever at the bottom of your post?</STRONG>
Head gasket at a minimum, check the head for flatness while its out, mine had a 0.008" and 0.006" warp ended up getting a new head, then replaced the radiator since it was the cause of the overheating that led to the head warpage.
 
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