A/C not working?

200,000 MILES • 1.5L • 4 CYL • 2WD • MANUAL
Avatar
MARIOC68
  • MEMBER
  • 120 POSTS
The temperature in the A/C grille vent is 47 ° F. Is this temperature normal? The compressor's low pressure indicates 35 psi at an ambient temperature of 90 ° F.
Nov 11, 2018 at 9:19 PM
Avatar
JONNYB1963
  • ✓Experienced Mechanic
  • 263 POSTS
Hi Mario,

To me, 47 degrees is just a tiny bit on the warm side. Generally I see temperatures between 35 and 45 degrees on the inside vent outlets.

What caused to check the temperature? Have you noticed your A/C performance getting worse and not cooling enough or were you just curious and wanted to know?

Regards,
Jon
Nov 12, 2018 at 12:30 AM
Avatar
MARIOC68
  • MEMBER
  • 120 POSTS
In all the web pages that I visited, they indicate how you say. But tend more at 40 ° F (about 4 ° C). According to a workshop manual for Toyota Corolla indicates the following specifications:
Low pressure: 21- 28 psi
high pressure: 206-213 psi.

If I have 35 psi, do I have excess refrigerant?
If there is excess, prevents it from cooling even more?
Nov 12, 2018 at 12:47 AM
Avatar
JONNYB1963
  • ✓Experienced Mechanic
  • 263 POSTS
It could mean that you have an overcharged system. One of the symptoms of an overcharged AC system is inefficient cooling.
Has this system been charged using one of those single gauge, can type units that they sell at the auto stores?
Do you notice any icing up of the A/C lines anywhere?
Jon
Nov 12, 2018 at 1:23 AM
Avatar
MARIOC68
  • MEMBER
  • 120 POSTS
I took it to a refrigeration workshop, there they told me that the pressure was leaving it at 35 psi. They apparently ignored the pressure ranges for the vehicle as I do so far. It can be perceived that the low pressure line cools and when it switches off, the conditioned air condenses.
Nov 12, 2018 at 1:31 AM
Avatar
JONNYB1963
  • ✓Experienced Mechanic
  • 263 POSTS
So the shop you took it did a recharge on it? Or just checked it for you?
Nov 12, 2018 at 1:49 AM
Avatar
MARIOC68
  • MEMBER
  • 120 POSTS
In the workshop the recharge and verification was done, it was there that the manager told me that the pressure was leaving it at 35 psi once the recharge was finished.
Nov 12, 2018 at 2:12 AM
Avatar
STRAILER
  • ✓Experienced Mechanic
  • 55,676 POSTS
Good to hear.

This guide can help you see what normal pressure are and how to troubleshoot issues.

https://www.2carpros.com/articles/re-charge-an-air-conditioner-system

Use 2CarPros anytime, we are here to help. Please tell a friend.

Cheers, Ken
Nov 14, 2018 at 3:58 AM
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.

Frequently Asked Problems for This Vehicle