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How can you tell if it is just the thermastat or both the waterpump and themastat? I noticed that my heater did not work (it was 39 deg out) then yellow light came on in about 5 min engiene temp gage did not come up at all shut off for 15 minutes started car saw tempeture gage jump up then drop right back down still no heater yellow light came on in about 5 min.
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