Overheating Question...

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wmatthewt

wmatthewt

10 Year 15 Year
Joined
Nov 29, 2006
Threads
20
Messages
107
Location
Madison, MS
Website
www.bowtielawyer.ms
My '98 100 is running real hot at idle and slow, stop and go traffic speeds, getting into the red. As soon as I get going it drops immediately. No codes or check eng light...

What do y'all think it is? I did a cursory search and did not see this specific issue addressed...

Any recommendations? Thermostat? Radiator?

DX was fan clutch
 
Last edited:
Could be more than this - but how's the fan clutch? Low air flow w/o force air at speed is sometimes a driver for overtemp at idle. Does it look like it's rotating slowly, if at all, at idle - amost [Not that I'd ever suggest you try this] like you could stop it by hand?
 
Mine was running warm today, I took it as a sign that it was HOT AS HELL outside today.

I'd start with a good flush and refill with Toyota coolant and a new Toyota radiator cap. The cap plays a roll in the pressure regulation on the system.

If that doesn't fix it I'd look at the fan clutch, and then the radiator.

That would all be after I searched the hunderd forum for regular issues.

JMHO
 
Notice Greg said TOYOTA coolant, the red stuff. My 80 was having issues and I finally flushed a second time and used the red stuff and it fixed the hot issues for me. I don't know how my rig knew I was using the regular green coolant but it did.
 
needed fan clutch

Fan Clutch was bad ...285 bucks, a fan clutch and 1/2 gallon of red she is as good as new...courtesy of graves and stoddard. I have no complaints.

Thanks for your help and responses.
 
wmatthewt said:
Fan Clutch was bad ...285 bucks, a fan clutch and 1/2 gallon of red she is as good as new...courtesy of graves and stoddard. I have no complaints.

Thanks for your help and responses.
Click to expand...

Never give up so easy!!! You learn so much more by systematically replacing everything.
 
I know trial and error are a great way to learn, but in this instance i would have flushed and chaged the radiator coolant, changed the thermostat, bought a new genuine Toyota radiator cap, :o all before getting to the fan clutch...perhaps all would have been good maintenace, but I still would not have had my problem solved...

Next time I will replace parts indiscriminantly:D

Again, thanks for the responses and being a great resource, but for this forum I would not have known about graves and stoddard...
 
Mat, I'd recomend a new cap if it wasn't part of G&S's invoice. It's cheap, and plays a part in pressure regulation, which affects fan clutch life.

I agree with Tony, throwing money and time at the truck a great way to learn.. just ask Barry, boy has he learned a lot! :D
 
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