Originally Posted by AlphaCrow
Hi (yet) again! I'm losing coolant, but no leaks or drips. I have once or twice smelled coolant in the air vents, but that was rare. Advice I got was that it might be burning up in the heater core somehow. I know it's possible that it's getting into the engine block, though I've had no side effects of that. How would I find out if it's being lost in the heater? Is that through a hose, thus repairable?
any coolant leak in the heater core would cause you to have a strong smell of coolant and the windshield will also get a film on it. leakiing on the internal floor may not occur. the air box drain may discharge the coolant..
using about 10 psi of pressure remove the heater hoses from the engine and pressure test the heater core.
most likely the mysterious loss of coolant would be the water pump gaskets or the weep hole.
with head gasket failure you should get DTC check engine light. also poor engine performance and for sure running at higher temps.
pressure testing the complete coolant system would be a start.
I would use a dye product , and by adding this to the coolant use a black light to see the area of leak .