Have been told that my Subaru needs a head or gasket change on 2007 Subaru B9 Tribeca

Just had the two top hoses replaced as well as the belt, after doing this they topped up the cooling system with new coolant and then supposedly did a CO Test on the cooling system and told us their was CO in the coolant, up to getting the leak from the top hose we never lost any coolant and the engine has never gone past the middle of the temp gauge except for pulling the camper trailer across the Nullabor on a 51 degree celcius day where it went up one bar past the middle. Even the oil level has never moved, vehicle is serviced by the book and is coming up for its 95000km service. Have been told that this will cost me anywhere between $2000 to $6000. To me it sounds suspicious since as I said the car is not going through coolant and not eating oil, also their has been no power loss or smoke coming out the exhaust, since putting the new belt and pipes on everything seems to be back to normal again. Any help would be appreciated.

by in Wake Island, HI on March 08, 2013
3 answers 2 comments
ANSWER by on March 08, 2013
They give a lot of problems with head gaskets this i know! You can always get a second opinion.
COMMENT by on March 08, 2013
Thats what the mechanic said, bloody hard when your in a small town and theirs only about 3 other mechanics which will touch Subaru's. Will probably do it though just to make sure.
ANSWER by on March 08, 2013
Head gasket problems are a commom problem with Subaru. They could have gotten a false positive test. You could do a wait and see if a problem developes.
COMMENT by on March 08, 2013
Noticed this morning that they didn't do what they have said in the paperwork, supposed to have drained and flushed the system however on checking it this morning it looks like all they did was fill it up, since their is only a hint of the coolant in the system. Looks mostly like water.
ANSWER by on January 04, 2015
Sometimes exhaust pressure will get into coolant from a bad head gasket. However I would be very suspicious of a DX of a head gasket on a vehicle unless it runs really hot for no reason and you find excessive pressure from exhaust heat in the coolant. I had that problem so bad that within 3 minutes of running the engine the temp gauge for coolant would be over 3/4 hot and before I could get out of the car and open the hood I could actually hear the pressure and see bubbling in the overflow tank. I did not have any excessive oil usage, loss of power, or smoke coming out the exhaust, but I was using coolant and the engine did overheat about 2 month before the problem became apparent. Towing a Camper trailer with a Tribeca in that heat in just being reckless and probably could have been the cause and not a vehicle defect.

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