A/C faulty

1998 CHEVROLET ASTRO
140,000 MILES • 6 CYL • 2WD • AUTOMATIC
Avatar
LUCKY-ONE
  • MEMBER
  • 1 POST
The A/C system in this van gets really weak or diminishes whenever I approach uphills or freeway up slants. It either slows down blowing cold air until the road gets to even parallel.
Jun 1, 2018 at 8:01 PM
Avatar
ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
Good morning.

This system work on vacuum to keep the blend doors in one position when commanded. Under a load, there is a tank or check valve that should keep the doors in the correct position until you let up on the accelerator. You either have a vacuum leak from a hose or the check valve or tank is leaking.

Check the vacuum lines carefully for any breaks or leaks. If none are found the tank needs to be replaced.

Roy
Images (Click to enlarge)
Attached Media
Attached Media
Jun 1, 2018 at 8:58 PM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle