Gold Lifetime Member
Join Date: Jan 2005
Location: 2 Dog Town in West Texas
Re: 1969 Camaro - 302 Overheating
Its possible the impellor could have gotten loose but its not normal. They are pressed on, I never like the newer or even rebuilt units as they all have open impellors compared long ago when comparing to a GM pump that had cast closed impellors, think if it as cavitation . I started putting on what they call a FlowCooler disc that rivets to the back of the impellor , of course you have to take the backing plate off. Plates are sold or were sold thru Summit or jegs. But this is just a trick to help move water and not allow cavitation in the pump.
Now I am not sure why you want to run a 195° t-stat but you can get down to 170 or so.
I always drill a couple of 1/8" holes on each side of the t-stat flat plate, this allow water or air to move out , before the t-stat opens.
To keep from handling hot water, I would pull off top radiator hose and fill with a hose or the sort. I would take off the heater hose coming from the heater box to the intake, do the same . Once you feel you got all the air out, then start motor , leave radiator cap off until you see water moving across the radiator, once that's done you can put cap back on.
I think the movement in your temp gauge you see is actually the t-stat trying to open as you see a rise and then a fall of the needle, but if there is air in that manifold, the t-stat will not respond until hot water hits it.
TC # 349
Zdld17:69 Z/RS,306, NOR141111, 9N554XXX, 12A, X3G, 59/59,723, AFR 195,CCC282/290HR, TKO 600, BU1122B1E Owner since Dec 1968
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