Webb
Senior Member
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My TR6 has never been known for overheating...I've had it 4 years and rebuilt the engine twice and it's never overheated on me except in sluggish, hard driving. For some reason I start the car up and it runs for a little while and the temp needle comes off cold and slowly begins to move up, like normal, and then after it's a few millimeters off cold all of a sudden it will move very quickly across the gauge. It still moves in a "dampened" sort of way...it doesn't just fly straight over to hot, but it moves very quickly. I replaced the thermostat, and it's still doing it.
Before I replaced the t'stat I had driven the car an hour and a half to Richmond, VA on the interstate and it did fine. When I started it to leave the next day by the time I got out of the neighborhood, the gauge was pegged to hot and it was boiling the antifreeze, so I don't think it's just a faulty sensor. I shut the car down immediately after seeing it, and I can't imagine that I drove for more than just a minute or two with it that hot, as I check the gauges regularly. The first time it overheated the other end of the hose that runs coolant to the intake manifold had slipped back from the tube fitting slightly (although it was not completely off) and was spraying coolant all over the side of the engine, but I do not know if this is what caused it to overheat, or if it did this because the coolant was so hot.
Before I replaced the t'stat I had driven the car an hour and a half to Richmond, VA on the interstate and it did fine. When I started it to leave the next day by the time I got out of the neighborhood, the gauge was pegged to hot and it was boiling the antifreeze, so I don't think it's just a faulty sensor. I shut the car down immediately after seeing it, and I can't imagine that I drove for more than just a minute or two with it that hot, as I check the gauges regularly. The first time it overheated the other end of the hose that runs coolant to the intake manifold had slipped back from the tube fitting slightly (although it was not completely off) and was spraying coolant all over the side of the engine, but I do not know if this is what caused it to overheat, or if it did this because the coolant was so hot.