Q: My radiator boils after the car has stopped. The cap has been replaced, thermostat, fan sensor, etc. 2006 Chrysler PT Cruiser

asked by on January 17, 2017

My radiator boils when I run my car for a little while. The cap, thermostat, fan sensor, have been replaced. Also the blue devil radiator sealer was put in there because it was smoking too. The smoking g has stopped but if driven a long distance the gurgling will happen once it's parked.

My car has 245000 miles.
My car has an automatic transmission.

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Hi there - the "boiling after shutoff" symptom is evidence of excess engine heat which is not being radiated by the radiator. Most likely, the "sealant" you added to the cooling system prior, is biting you back. The leak sealant coatings inside the cooling system added by this sealant, reduces both ability of the engine to shed heat to the coolant, and to transfer heat to the radiator fins (and outside air) to get heat out of the cooling system. I recommend both a coolant system flush to get the sealer out of the system, and a leak inspection so that the source of the leak can be determined and fixed. I suggest you get this done by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.

Hi there. Although it’s designed to plug a leak, in most cases, radiator ’leak products’ tend to do more harm than good. It’s quite possible that the sealant leak material is clogged somewhere in the cooling system; possibly in the heater core. It’s probably a good idea to have a professional mobile mechanic come to your location and complete a car is overheating inspection, to determine why you’re car is having this problem.

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