Two problems related to vehicle overheat have been reported for the 2005 Chevrolet Equinox. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 Chevrolet Equinox based on all problems reported for the 2005 Equinox.
Car started overheating and was diagnosed as a bad head gasket and repaired. After the head gasket was repaired the Equinox started overheating again and this time it was diagnosed as a cracked cylinder head. The motor was replaced. The replacement motor lasted 3 weeks before it failed as well with the same diagnosis as before, a bad head gasket. I contacted gm. They offered no solutions, offered no help in repairing or replacing the engine. The car is dangerous to drive and they know the engines in the 2005 and 2006 (VIN f) are bad engines suffering from a poor design. They didn't make the engines only for 2 years because they worked so well. Numerous reports about the bad engines with gm's response simply to spend more money on a car that won't last past 100k miles.
Car overheated going down the interstate (about 65 mph). Blew a head gasket, fixed that. Then overheated a week later while in town driving (about 45 mph) blew a head gasket again.