Just wanted to know how the rear heat/ac works, does it just feed of the front controls? Asking this because front heat works but when I turn the blower on for the back, it just blows cold air.
mountainmanjoe
January 31st, 2018 4:25 PM
Coolant flows through pipes under the body to the heater core in the rear unit. Probably the valve under your hood is stuck closed.
Jordan Bray
January 31st, 2018 6:18 PM
Could the heater core in the back be bad?
Jordan Bray
January 31st, 2018 6:23 PM
And where is the valve located under the hood?
StanVan
January 31st, 2018 11:08 PM
My '93 Astro only had A/C in the rear. I don't know about a '95 G. It shouldn't be too difficult to trace the lines to find out where a valve might be.
mountainmanjoe
February 1st, 2018 2:48 PM
Originally Posted by Jordan Bray
(Post 352117)
Could the heater core in the back be bad?
Bad how? If it leaked badly enough to stay cold, you would have a huge puddle inside your van. I can't imagine that your cooling system would have big enough debris to plug up a core. But I suppose you could hook up a garden hose to it and find out for sure.
Originally Posted by Jordan Bray
(Post 352119)
And where is the valve located under the hood?
Sorry, I don't know about your year. Just trace the lines forward from the rear heater. The front heater is on the passenger side of the underhood compartment. It should be close to that. Get your van good and hot, and use your touch. Once you find the valve, pull it out and test it. It will probably be vacuum actuated. Make sure it is getting good vacuum. Those lines tend to rot out.
ThroatwarblerMangrove
February 3rd, 2018 6:51 PM
On my '93 G2500 (which should be the same as your '95) the water control valve for the rear heater is directly behind the R headlight, under the coolant recovery tank.
