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Thermostat Replacement...Just replaced Radiator...Don't want to drain entire system again 200 1990

Tom,
As others have mentioned you can drain the system down by using the petcock on the passenger side lower rear of block. I use an old piece of garden hose, cut to about a 4 foot length, 13mm wrench, and a catch pan. For the T-stat, 10mm wrench, make sure you get the rubber O-ring gasket that fits over the T-stat lip and you will not need any sealant. Make sure you scrape the crud out of the inside groove of the T-stat housing, and that the T-stat is in the groove and the housing is flush with the head before tightning.
--
Bruce S. near D.C.






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