Engine overheating

WWNSINGO

MEMBER
2003 MAZDA CAPELLA
1.8L
4 CYL
2WD
MANUAL
200,000 MILES

Engine is overheating and produces steam after over speeding at the end of the coolant reservoir tank overflow pipe. When I turn off the engine I hear a bubbling sound coming from the coolant reservoir tank. The reservoir tank has developed some brown residue. It is a Mazda B1800 Thailand make. What could have gone wrong?

1 Reply

STEVE W.

MECHANIC
13,480 POSTS

With those symptoms I would say you have a bad head gasket. The brown residue points to combustion gasses getting into the coolant system as does the gurgling of gasses in the system. First thing I would do is ensure the coolant level is full. Then start it and let it warm up. Shut it off and let it cool. Then run a few tests to be sure.

https://www.2carpros.com/articles/head-gasket-blown-test