We have a 2007 Chevy Uplander that is having heater problems. It works fine while driving down the road, but when we stop at a light, it quits blowing hot air. The air is still blowing it just gets cold. We flushed the radiator, and it helped for a while, but the problem returned. This also happened on our previous van which was a 2003 Chevy Venture. This also happened on my sister in law’s Venture. This is apparently common with this van, but how do we fix it? We only have 50,000 miles on the van and hope to keep it several more years.
The problem might be that there’s air trapped in the cooling system. Try this.
Get the engine up to operating temperature. With the engine idling, slightly loosen the upper radiator hose clamp. Take a small flat bladed screwdriver and slip this between the upper radiator hose and the radiator hose neck. Allow the engine to idle until all the air is purged from the cooling system. Remove the screwdriver and retighten the hose clamp.
Thanks, I will give it a try this weekend. I’ll let you know.