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Old 07-31-2003, 07:35 PM   #1 (permalink)
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Top hose hot, bottom hose cold???

A little background first. 22RE, just rebuilt and put in the rig Sunday. Started yesterday for 1st time. For some reason it wouldn't start until I grounded the EFI harness.

Anyway, I started it today, let it run until the temp gauge started to move then drove it for a few minutes. I planned to drive it more but it's really LOUD with just the header. I'm looking around when I get back and I notice the top hose is hot like it should be but the bottom hose was cool. The 3rd hose was hot at the water pump end, barely warm at the other.

I drain about 1 gal. out of the radiator. At least the 1st half gallon is barely warm, but by the time the jug was full it was hot. Then I started to drain some from the lower hose, also hardly warm. After I had drained maybe a pint the lower hose was hot too. ??? WTF?

It was running long enough for the coolant to have been through the whole system. I'm going to run it tomorrow with the cap off to see if it's circulating.
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Old 07-31-2003, 07:55 PM   #2 (permalink)
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sounds like a stuck thermostate (sp?)
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Old 07-31-2003, 08:00 PM   #3 (permalink)
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Quote:
Originally posted by drnut
sounds like a stuck thermostate (sp?)

Yup...
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Old 07-31-2003, 08:05 PM   #4 (permalink)
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Sounds like your radiator is doing its job to me. Hot water goes in, cool water comes out. So whats the problem?
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Old 07-31-2003, 08:06 PM   #5 (permalink)
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Yep!!!! Did you install the T-Stat the right way!!!!
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Old 07-31-2003, 08:17 PM   #6 (permalink)
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top hose is out of the motor and bottom is in. as long as your truck is not overheating it is working the way it's supposed too. if overheating is the issue you should edit to include in your first post. if the upeer hose is hot it is because your thermostat is working, if not the would be cold water in that hose too.
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Old 07-31-2003, 10:08 PM   #7 (permalink)
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Quote:
Originally posted by zags
Sounds like your radiator is doing its job to me. Hot water goes in, cool water comes out. So whats the problem?
I agree
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Old 08-01-2003, 04:11 AM   #8 (permalink)
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Thanks. I do understand the hot in/cooler out theory but I don't think a radiator would drop the temp that much. From 195* down to say 80*?? That's some serious cooling. I'll run it again today.
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Old 08-01-2003, 04:49 AM   #9 (permalink)
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Did it reach normal operating temperature on the guage? What you described is normal until the t-stat opens up, then they should be about the same temp.
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Old 08-01-2003, 05:59 AM   #10 (permalink)
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Quote:
Originally posted by 85TrailToy
Thanks. I do understand the hot in/cooler out theory but I don't think a radiator would drop the temp that much. From 195* down to say 80*?? That's some serious cooling. I'll run it again today.
My buddy has an '86 Toy 22RE and when his T-stat stuck open the coolant would not even get hot enough to put out any heat from the defroster. I don't think 80* is all that far fetched...
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Old 08-01-2003, 07:32 AM   #11 (permalink)
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Quote:
Originally posted by Gone Huntin'
Did it reach normal operating temperature on the guage? What you described is normal until the t-stat opens up, then they should be about the same temp.
Sorry, guess I left that out. Yes, the guage reads exactly where it always did, about 1/3 of the way up. I don't have the 'real' gauge on yet, I need an adapter for the sender.
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85 4Runner 4.88's 4.7's Lockers 35's Drivetrain/Gas tank lifted Dents all over

[b]9-11-01: REMEMBER DAMMIT![/b]

"Who's the fella owns this saloon?"

[QUOTE=4RnrRick]Whay would woul have poer to teh wheels if I'm in neutal![/QUOTE]
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Old 08-01-2003, 07:40 AM   #12 (permalink)
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Shoulda let it run for a few more minutes and see what happened, as long as it's not overheating.
It sounds like everything's normal, and you interrupted it only a few seconds after the thermostat opened up, so most of the water in the rad was still cold, just what had freshly come out of the motor was warmed up. The temp sensor is on the engine, so as soon as the thermostat is warmed up (not necessarily the whole system) it'll show "normal".
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