CHEVROLET ASTRO CLIMATE CONTROL

Heater Problem 1991 Chevy Astro 6 Cyl All Wheel Drive Automatic We're Trying To Fix The Heater Core And Need To Know How To Remove The...

I Have Replaced The Purge Valve, Also Canister Vent Valve And Gas Cap. Drive 90 Miles Same Code Returns I Clear Code Drive Around 70 Miles...