Hi Scotty! So I’ve had an issue that I am just DYING to solve! I have a 1989 Mitsubishi Galant GL 1.6L manual New Zealand New with a carburetor engine. The car has only 50,000kms and has been driven by an elderly person prior to me and always stored in a garage. Heck, the thing has no stone chips or fade and looks brand new inside and out!
However, the car had been driven for about 1 hour on a motorway and then at the lights, it started to overheat, which quickly cooled again once driving commenced. When I had parked the car again, the coolant started boiling and it disappeared somewhere until there was no coolant left in the reservoir.
Now, I’ve done a combustion check for head gasket and a coolant pressure test and both came out negative. When the engine is hot, I see small air bubbles coming out from the coolant reservoir. The engine oil looks clean but the coolant has tiny white flakes (probably from an irontite head gasket sealer that my mechanic had used to mix with the coolant in hopes to fix the head gasket.)
I feel like the car smokes a bit of white from the tailpipe and using K-Seal gasket seal didn’t seem to work either. I had properly flushed the coolant and applied K-seal myself due to an unsatisfactory job by my mechanic.
I’m a veterinary student so will need the car for many years and so I am willing to do a headgasket if I must, but at the same time scared that it may not be that. I have been to my mechanic for the combustion and pressure test as well as a thermostat replacement. At this stage I’m scared he’s either not a very honest or experienced mechanic.