Coolant temp sensor - red or green?

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Apr 3, 2026 | 11:29 AM

#16

adrianpglover

Thread Starter

Tuned

Joined: Jun 2025

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I'll just keep an eye out for the temp sensor jumping to cold. It only happened on that one drive. Could have been a bad connection. That wire didn't seem like the best in the world around the boot where it connects to the sensor.

Apr 5, 2026 | 06:04 AM

#17

AuroraGirl

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Joined: Jun 2021

Posts: 5,221

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Quote:

Originally Posted by adrianpglover

Originally I flushed it by draining, filling with distilled water and prestone cooling system flush. Then normal driving for about a week or so, followed by draining, filling with distilled water again, run for around 30 minutes, drain, and repeat. Do this until almost clear water draining (around 11 times). Then filled with concentrated antifreeze until full, and top off the overflow with 50/50 mix. At that time I had a lower opening thermostat, like a 180 or so.

Then I had the head off in December for a broken exhaust manifold bolt. While it was off, I hosed down the head and ran water through until fully clean, lapped valves, dried out with compressed air, and reinstalled it. Did roughly the same procedure as above, though this time I used a 195 thermostat and didn't use the chemical flush. At first I had installed the thermostat backwards, then double checked the diagram in the service manual and flipped it back around. Didn't run the engine with it in there the other way.

did you follow the procedure to install the thermostat? its installed by placing it on the housing then to the head. it has to be rotated the proper way and then not move, did you do that?you may have crushed the thermostat slightly preventing full movement on the pintle