Question about 1991 Lexus LS 400
You need the thermostat, we used to try to run cars without them here in Florida, but it doesn't work, and the coolant is a must. Water boils at 120, coolant boils at 265 in a sealed unit, like a radiator. So, if you are running straight water, you can see how it won't even reach operating temp of 200 degrees without boiling over, or building up too much pressure. Even a little glycol mixed with water would be better than none. Hope this helps.
Posted on Apr 27, 2010
First would be the thermostat. If you have already done so, change the temperature sending unit.
Posted on Apr 26, 2010
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Posted on Jan 02, 2017
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