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There's a lot of churn here but some of the basics still aren't mentioned:
1. Are the belts adjusted correctly?
2. You should eliminate temp-comp board. There are how-to pics here and on Art B's site. Have it done if you can't; or maybe there's someone from this board near you. But you're reacting to a gauge that might be giving a false reading.
3. Did the tech who replaced the thermostat get the correct one and position the vent correctly? I just puled a non-vented one from a 240, presumably a local parts store "The part number is different but this is the exact same thing ..."
4. The foaming thing is new to me. Overheating IME is: loose belts, sludge/scale in the system, bad thermostat, or (rarely) a bad impeller in the water pump.
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240 drivers & parts cars - Ohio
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