Coolant smell comes into the cab when heat or AC is turned on

[driskelljc]

1996 F250 7.3L XL / 250,000 Miles / Manual /

When I turn on the heater or AC I get a semi strong smell of coolant fluid in the cab of the truck. I only get the smell for a short bit when I turn on the heater or AC, it will go away after about a minute or so. I did just replace the blower motor but it wasn’t until after replacing the glow plugs a few days later did I notice the smell. I checked to make sure that I didn’t nick a hose, and I haven’t noticed any coolant leaks. Oh yes – Firestone did replace my water pump, clutch fan and fan. This was before anything I replaced and long before I smelled anything out of the usual.

Appreciate your input in the matter !!

[greasltn]

If you turn your defroster on does the windshield fog up? You may have a small leak in your heater core.

[driskelljc]

No, I can use the defroster - in fact it works better now with the new bower than it ever did. I was thinking the same - a small leak internally, but what is the best way of checking to see if I have a leak in the heater core ?