nightowl

How do you blow powdered sealer into the heater core? Googled it but only came up with adding it to your coolant and letting it circulate.

I'll check into that. I just can't understand when I did a pressure test it held at 15psi for a few hours.

I did use bars leak last winter and it did not help.

2003 silverado. I started smelling coolant in the cab last winter when the heat was on. No smell this summer with a/c or vent. A couple weeks ago I drove it on a cool morning and turned the heat up a little and smelled it. I assume it is the heater core. The carpet is dry and the windows don't fog up or oily. I just did a pressure test and no leaks and the pressure held at 15psi. Any ideas?

My a/c compressor isn't working in defrost setting, my windows are staying fogged up. Compressor will kick on then right back off. I think the refrigerant is low. I was going to get a can and recharge but all I can find is the kind with the leak sealer in it. I have read not to use any with a sealer, and I have read it is OK. I am assuming that is all I can find it would be OK to use?