Performance not Pressure

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

Moderators: bohica2xo, Tim, JohnHere

Post Reply
arty4444
Posts: 29
Read the full article
Joined: Wed May 31, 2017 11:00 am

Performance not Pressure

Post by arty4444 »

Hi, just had new compressor installed for my van's AC and with no book value amount of refrigerant to go by shop said they went "by pressure". Cools well but at hiway speed compressor cycles on about 17 secs then off about 17 secs. The off is very noticeable due to hi (90+) heat outside. I would like to tweak the coolant to cut down that off time. Did it once before from the low side only with very good results but can't remember if I had to add or subtract a little bit to get desired effect. Any ideas would be appreciated. Add or subtract?
User avatar
JohnHere
Preferred Member
Posts: 1197
Joined: Sun May 13, 2018 10:20 am
Location: South Carolina Upstate - USA

Re: Performance not Pressure

Post by JohnHere »

According to my reference sources, your van with an OEM front and rear A/C system calls for 46 ounces of R-134a. With an aftermarket rear system added to the front OEM unit, the exact amount of refrigerant becomes a guesstimate. Did the shop happen to tell you how much they put in it?
Member – MACS (Mobile Air Climate Systems Association)

Thankful for the responses you have received? Please consider making a monetary donation to this Forum.
Post Reply