1989 Chevy Astro
Her's the trick! Replace rear heater vacuum valve with simple on /off line valve! Also, at the rear of the intake manifold there is the main hot water flow valve to both heaters! It is on the right side just next to the distributor! Clean it ! Replace it! Mine is a backflow preventer type, clean or replace! Back flush core with cleaner really helps! Just did mine! Wonderful HEAT!
have the same problem?
Sunday, November 2nd, 2008 AT 3:41 PM