Coolant smell ONLY with defrost on
I have done a search and nothing seems to match, so here goes. '97 SE with 90k miles. Had a coolant flush at 75k, dealer put Dexcool in. Last week, I had the coolant by-pass elbow on the intake replaced because it was leaking. For a few months I've gotten a wiff of coolant ONLY with the defrost on. The windshield doesn't fog up, isn't greasy, and the carpet isn't wet. There are no leaks under the car. Pressure tested ok. Is it time for a manifold gasket job? Should I do the dye in the coolant test or just leave it.