Notices
Express & G-Series Vans Offered in both a full size van, or a large box truck, the Express is the modern GM workhorse

Chevrolet Express
Platform: GMT Van

1995 G20 Rear Heat

Old January 31st, 2018, 3:14 PM
  #1  
CF Beginner
Thread Starter
 
Join Date: Jan 2018
Posts: 3
Likes: 0
Received 0 Likes on 0 Posts
Default 1995 G20 Rear Heat

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.
Jordan Bray is offline  
Old January 31st, 2018, 4:25 PM
  #2  
CF Veteran
 
mountainmanjoe's Avatar
 
Join Date: Feb 2017
Posts: 1,070
Likes: 0
Received 5 Likes on 5 Posts
Default

Coolant flows through pipes under the body to the heater core in the rear unit. Probably the valve under your hood is stuck closed.
mountainmanjoe is offline  
Old January 31st, 2018, 6:18 PM
  #3  
CF Beginner
Thread Starter
 
Join Date: Jan 2018
Posts: 3
Likes: 0
Received 0 Likes on 0 Posts
Default

Could the heater core in the back be bad?
Jordan Bray is offline  
Old January 31st, 2018, 6:23 PM
  #4  
CF Beginner
Thread Starter
 
Join Date: Jan 2018
Posts: 3
Likes: 0
Received 0 Likes on 0 Posts
Default

And where is the valve located under the hood?
Jordan Bray is offline  
Old January 31st, 2018, 11:08 PM
  #5  
CF Veteran
 
StanVan's Avatar
 
Join Date: Jul 2008
Location: Fairfax Virginia
Posts: 1,208
Likes: 0
Received 2 Likes on 2 Posts
Default

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.
StanVan is offline  
Old February 1st, 2018, 2:48 PM
  #6  
CF Veteran
 
mountainmanjoe's Avatar
 
Join Date: Feb 2017
Posts: 1,070
Likes: 0
Received 5 Likes on 5 Posts
Default

Originally Posted by Jordan Bray View Post
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 View Post
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.
mountainmanjoe is offline  
Old February 3rd, 2018, 6:51 PM
  #7  
CF Beginner
 
Join Date: Dec 2017
Posts: 22
Likes: 0
Received 0 Likes on 0 Posts
Default

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.
ThroatwarblerMangrove is offline  

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: