coolant tank is overheating and bubbling after you park it


Asked by Jan 14, 2015 at 02:45 PM about the 2002 Chrysler 300M

Question type: Maintenance & Repair

car drives ok no overheating problem but is bubbling and steaming when parked. Next day
check coolant tank have to refill

11 Answers


you might have a bad head gasket. you can test it yourself. get a combustion leak test kit from your auto parts store and then follow the instructions on the package, or watch a you tube vid on how to do it. it is a pretty conclusive test. If you don't want to tackle it, a lot of mechanics have equipment to sniff the system. the do it yourself kit is about 40 bucks.

2 people found this helpful.

yes head gasket is my vote .....//is it a 2.7 ??


Could it be the thermostat

3 people found this helpful.

i do not think its head gasket everything is work fine gauges are good . temp gauge normal ,car drives normal. change radiator and thermosat and it stop for awhile . it only bubbles up after i park car after driving it. had engine, water pump replaced about 6 months ago. in the summer had no problem now its cold outside this problem . thanks for your advise its anything else that can be cause the problem.

1 people found this helpful.

i am sorry engine is a 3.5 mopar john


my cousin had a 300 with the same issue you are having and was only doing it in his parking spot at work ...after trying to get it to do it and testing everything else we put the block tester on it and it was a head gasket ...I would either buy the kit or bring it to a shop and have them test it this way you can rule it out for sure

2 people found this helpful.

thanks for the advise moparjohn


The mentioned test is a good starting point. Another test you can try is let the engine cool all the way down then remove the radiator cap then start the engine and watch for bubbles. If you get bubbles right away it is the head gasket or a cracked head if no bubbles right away still could be head or gasket, but less likely.


Hey i found out what was wrong simple fix the cap on fill tank needed to be replaced. I believe it has a pressure fitting that opens and closes change cap havent had problem sense.Maybe help for anybody else that have a 2002 300m.

7 people found this helpful.

Cameron im having the same issue the resovor cap needs to b replaced but also looks like my whole resovor is leaking air from the ring around where u put the radiation cap bak on did u have to bleed it after u put that resovor cap?

1 people found this helpful.

yeah you have to bleed system there is a bleed valve in the system.

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