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Old 08-23-2010, 05:34 PM
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Default Overheating under load

97 fzj80 with 168k miles. I have searched and checked the Faq on Mud but can seem to find any answers to my problem.
According to my scanguage II It was running around 190-200 in the city but if i went up an incline at highway speed or in the city It would shoot up, i had to put on the heaters a few times because it would get to 215-220 and keep going if i didn't stop.
I started trying to diagnose, first thing was a new rad cap and it didn't do anything. Flushed the rad (looked fine inside) and temps went down a few degrees but still very hot.
So i went ahead and bought a new Radiator (performance radiator), Thermostat, and fan clutch and did a complete coolant flush with Toyota red.
My temps have gone down alot but im still getting hot up bigger inclines. Its running around 185-193city but going up hills like canyon or lee hill its getting up to 215 and doesn't seem to stop.
I have not done a compression check but i did replace the plugs a week ago and all were dry, also im not having any bubbling in the overflow so i don't think it's the HG.

Im at a loss of what else to do, could the water pump cause these symptoms? Any other suggestions?
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Old 08-23-2010, 05:41 PM
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fan clutch? are you losing any coolant?
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Old 08-23-2010, 05:44 PM
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No leaks and replaced the fan clutch.
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Old 08-23-2010, 05:51 PM
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sorry missed that. I don't have a scan guage so I dunno what I hit on the hills. I think 220 is when the stock guage starts to tilt up. that's still Ok. maybe robbie has some idears
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Old 08-23-2010, 05:56 PM
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Is your exhaust restricted? The cats could be clogged.
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Old 08-23-2010, 06:12 PM
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What kind of fan clutch did you replace with? Is the mixture of coolant/water where it should be? Anything blocking the "radiator infront of the radiator" like dirt or other 4wheeling debris? Just a few thoughts.
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Old 08-23-2010, 06:21 PM
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I have not checked the cats, dont know how??
Blue fan clutch, i believe i did 50/50 for the coolant, maybe a little more water. I sprayed the all the rads to clear debris, i do have PIAA up front and tried taking them off but it makes no difference.
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Old 08-23-2010, 07:22 PM
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If the cat is restricted, the manifold vacuum should drop to near zero well before wide open throttle and make the truck noticeably slower than normal.

An issue that could show up on 60s (not sure about 80s) is a collapsing lower rad hose that restricts flow. A new lower hose or adding the internal spring to it solved that issue.
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Old 08-23-2010, 07:40 PM
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Quote:
Originally Posted by treerootCO View Post
Is your exhaust restricted? The cats could be clogged.
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Old 08-23-2010, 08:26 PM
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Are you running the AC when it gets hot? does turning the AC off have any effect?
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