Quote:
Originally posted by Notall There
...Refitted the t'stat that was in there, refilled with water, & ran up; took a while 2 warm up then the temp guage shot up to 1/2 way & stayed there! Checked the expansion tank was ok, top of rad was HOT but bottom hose was warmish, then the expansion tank started to bubble so i switched it off!
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You should go ahead and install your new thermostat before resorting to drastic measures. I'd take the temperature differential between the hoses as an indication that the thermostat now in place isn't opening as it should.
dcb