How do you fix the AC when it is stuck on defrost on an Astro Van?

Answer 1

This is a very common problem on this and several other GM vans, unfortunately (for the owners). Open the hood and look just to the right (passenger side) of the center of the van near the evaporator housing (a large, black, plastic case). You will, no doubt, after a short search, find a broken/burned, small, black vacuum line. This line originally connected to the intake manifold just to the left of the top of the engine (driver's side). On top of the intake (after removing all of the air cleaner nonsense that GM thinks looks so good cosmetically (big deal-- But, does it run?!) you will see a black, palstic round device (vacuum check valve) and the other half of the broken hose. Go to your local auto parts store and purchase a length of 1/8" or 7/32" vacuum hose approximately 3' in length. Replace the broken hose with the new hose and Voila! You have airflow once again! Now... if your A/C was not cooling BEFORE this occurred, it won't be cooling now. This procedure only affect WHERE the air comes out. If you have no COOL air, you should have your system checked out by a professional. Good luck SDIgroup ---- Kudos to the SDI Group, you saved me some money. It was exactly what you said it would be. To make things easier for me I removed the engine cowling aka doghouse. To remove cowling on 2000 year model see below, but not to change plugs. http://wiki.answers.com/Q/On_a_Chevy_Astro_Van_how_do_you_remove_the_engine_cover_to_change_plugs