99 silverado ac drier frosts up

Friendly format provided to inquire about automotive a/c systems.
Archived Forum

Moderators: bohica2xo, Tim, Dougflas, JohnHere

Post Reply
Posts: 1
Read the full article
Joined: Thu May 14, 2020 2:12 pm

99 silverado ac drier frosts up

Post by ngooch2 »

99 silverado 5.3
Replaced compressor, drier, orifice, manifold line, condensor, flushed evaporator, pulled vacuum for couple hrs, let it sit, no leaks, installed about 2 1/2 to 3 cans of r134, cools great but after a couple of minutes the drier frosts over, any help would be appreciated
User avatar
Site Admin
Posts: 608
Joined: Tue Apr 12, 2016 2:19 pm
Location: Scottsdale, Arizona

Re: 99 silverado ac drier frosts up

Post by Tim »

Which thread do you want to use? Having 2 of the same post is not the best for responses.
Please support ACKITS.com for your Auto A/C Parts and Tool needs.

Help Support the Forum
Posts: 369
Joined: Mon Apr 18, 2016 6:10 pm

Re: 99 silverado ac drier frosts up

Post by Dougflas »

Please give more info as rpm (should be 1500) Max cool. doors/windows open, low side psi, high side psi, Ambient temp, humidity, vent temps, does compressor clutch stay engaged?
User avatar
Posts: 373
Joined: Sun May 13, 2018 10:20 am
Location: South Carolina Upstate - USA

Re: 99 silverado ac drier frosts up

Post by JohnHere »

According to my references, the Crew Cab model takes 36 ounces of R-134a while the regular cab model takes 32 ounces. Charged directly from the small "12-ounce" cans without using the proper equipment, you won't notice that the actual amount each can holds often varies quite a bit. So I think what we have here is an incorrect charge amount.
GM Tech
Posts: 176
Joined: Fri Apr 22, 2016 7:22 am

Re: 99 silverado ac drier frosts up

Post by GM Tech »

Frosty A/D is Bad? News to me. Really humid conditions shows great cooling....
Post Reply