Hi Guest!
Hey - did you know if you click on the title of a thread it will take you to the first unread post since you last visited that thread?
but were afraid to ask: 
STOP!! Never post your email address in open forums. Bots can "harvest" your email! If you must share your email use a Private Message or use the 
smilie in place of the real @
Pretty Please - add it to our Events forum(s) and add to the calendar! >> 
GTP1960
Jedi Knight
Offline
Originally Posted by Merlin63Tr4
A bellows type thermostat can be affected by excessive radiator pressure.
Check your radiator cap pressure, should be 4 PSI for Tr3, 7 PSI for Tr4.
M.
my after market aluminum radiator came with an 18psi cap.
i didn't realize it but because the radiator could not vent , the way it is suppose to, as with a 4psi cap, the increased pressure restricted the bellows thermostat from opening, thus increased my operating temperature up to approx 200 degrees because the coolant could not transfer from the engine to the radiator correctly.
i surmise, continued operation under those higher temp. circumstances would have damaged seals, gaskets & hoses, as well as not being good for the engine either.
Changing to a 5 psi cap fixed it. Took Randall's advice and found an older guy at NAPA that could think out of the box.
He found a NAPA Balkamp #703-1543; 5psi, with the right dimensions.
now running at a shade higher than 185. (About a 15 dg. reduction)The puller comes on intermittently, ( as opposed to coming on and staying on).
never would have figured that out on my own.
