I am helping a friend with his 1st gen 2007 Matrix.
It has 400,000+ kms. He would like to get it through one more winter before purchasing another, if possible.
The tempurature guage was indicating intermittant overheating. The heater was delivering warm to cool. He changed the themostat. Now it overheats more regularly.
He just added 1/2 a gallon of antifreeze but has not spotted any visual leakage; no signs of AF on the oil dipstick; no white smoke out of the exhaust, no leakage underneath the car etc.. The heater put out great for about 10 minutes and then the engine started overheating again.
He does smell AF in the car.
Can the leaky heater core contribute to engine overheating somehow other that simply dropping the AF level to an inopperative level??
It sounds odd to me.
I got him to check the fan, and the serpentine belt tensioner.
I think he needs a heater core but what else is going on?
... front of the rad obstructed with leaves and debree (am I clutching at straws)?