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Old August 11th, 2017, 17:01
Tony the Liger Tony the Liger is offline
NAXJA Forum User
Join Date: Aug 2017
Location: USA
Posts: 38
Re: Temperature jumping from warm to hot and back again

Originally Posted by Tim_MN View Post
Replace the radiator cap. Buy a premium Stant or genuine Jeep radiator cap. The symptoms described are what happens when the stock 16lbs radiator cap starts to fail. The cap cannot hold the normal cooling system pressure and the pressure loss allows the boiling point of the coolant to drop, and the coolant momentarily flashes to steam. As the steam bubble passes the Coolant Temp Sensor the gauge jumps to 260. When normal or near normal cooling system pressure returns, the steam no longer forms.
I'll give it a shot. Makes sense. I appreciate the info.

Just got home with a new thermostat. You guys recommend taking it back, or go ahead and change it?
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