Radiator cap boiling over

Asked by May 16, 2016 at 08:43 PM about the 2002 Dodge Ram 1500 SLT LB 4WD

Question type: Maintenance & Repair

I got to work today and got out of my truck
and I heard something sizzling under the
hood. I popped the hood and Coolent was
boiling out of the Coolent reservoir with the
cap still on it. I also noticed that the
reservoir was swelling up and as the motor
cooled the swelling went back down and
Coolent went back into the motor. Any
ideas what's wrong?

2 Answers

195

First check is obvious, that is to make sure your engine is not running hot (over-heating). Check temp. gauge. Sounds like it could be a sticky thermostate. Check if you have heat. If you have no heat, it could mean that the thermostate is sticking, or the water pump is shot. Squeeze upper and lower radiator hoses, and feel for swiching noise, and a tempeture difference.

Gauges all good. Will check hoses in the morning. Thanks for the advice

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