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Still not fix! 850

posted by  n_sabardin on  Wed Aug 18 02:28 CST 2004
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I have a new thermostat.
I have no leak but I noticed that one of the heater core returns (at the firewall) was corroded a little from a potential small (and old) leak.
I have been putting coolant back a little after the hose replacement. Could still be burping from the flush.
I'm not sure how to check for combustion gas into the coolant but I would assume that if the gas can pass through, the coolant could pass through too in the cylinders and I would smoke.
The overheat happens really fast, in a matter of 5 seconds.
It can happen on the highway or at slow speed. It seems and (I stress "seems") that it happens after about 15 minutes of constant driving (or maybe engine running)
It really reads on the gauge like if it is blocking somewhere but I can't understand why turning the heater on fixes at least partially the problem (it prevents it from going in the red but it still might be above normal temp)
I'll try a new temp sending unit. At this point I might as well....






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