Re: Bellow type Thermostats

Posted by Tim Cole On 2015/4/8 14:52:04

My experience with those old bellows thermostats is similar to GTO. The cars ran hot.

Premium pellet types have demonstrated decades of reliability. When I do replace thermostats I always drill a 1/8 inch bleed hole if they don't have a jiggle valve and on Packards that don't have heater bypass I would drill two with size depending on the unit. This prevents cavitation erosion and promotes even warm up.