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Old 02-23-2024, 06:13 PM
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Quote:
Originally Posted by DJRodriguez88 View Post
Finally got some time to work on the 4runner today...

I put the thermostat back in, bled/burp using no-spill funnel, heaters on, etc...

With the heaters on full blast I'm hovering at 195-198F. As soon as I turn them off I start creeping up to 205+.

My lower radiator hose stays cool to the touch the whole time, sounds like my t Stat is either opening too slowly or not opening as much as it should.

I thought my test showed that it was working bit I guess not as well as it should be. I'll order a new unit and test it before install so I can compare the behavior
Don't try that test in the summer. The heater core is a reasonable fraction of the radiator in size (maybe 1/8 or so?) and its coolant flow bypasses the thermostat. Your test is showing there is no (or near no) flow to/from the radiator. Even when run 'upside down' the thermostat will keep the engine below 205*F, especially at idle.

-Charlie
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'99 4Runner SR5 Auto - 4WD swapped
'89 Camry Alltrac LE 3S-GTE 5spd
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