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Old August 11th, 2017, 14:14
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Tim_MN Tim_MN is offline
Freakish Hand Strength
Join Date: Mar 2003
Location: Minneapolis, MN
Posts: 6,139
Re: Temperature jumping from warm to hot and back again

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.

Originally Posted by bimmerjeeper

I'm starting to realize people on the Jeep forums are highly expert mechanics .....
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