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Thermostat on an H

D

David A. Smith

Member
Two questions regarding the thermostat on an H. First, how the heck does one get the thing out of the housing? Pry it? Unscrew it? Let me know. Also what do I replace it with? I see two available replacements: 165-190 and 130-155 (low boiling). I'm guessing the 165-190 ... what the heck is the low boiling model for? Thanks.
 
It is held in with a wire ring 9you might have to dig for it, or it might be a ring of corrosion and needs "chipping" out.
The higher heat is correct. be sure to put it in with the heat capsule toward the engine.

When alcohol was used as the antifreeze (ethylene Glycol was not invented) it was necessary to keep engine temps as low as was possible and still run OK. Thus the other range. Not a good idea, as it will make it run less efficiently. Jim
 
The housing that it's in (in the front of the engine) has two bolts on top that hold it together. You have to disconnect the radiator hose first then undo the bolts. If it doesn't come apart when those bolts come loose I would just get a flat screw driver and try to pry it open. If it's anything like mine itll have a lot of corosion and crap keeping it together. I'm not sure about the different thermostats though
 
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