PT Cruiser Forum  

Go Back   PT Cruiser Forum > General Forums > Tech & Performance Forum

PT Cruiser Forum

ac gauges?

LinkBack Thread Tools Display Modes
  #1 (permalink)  
Old 03 Jul 2011, 11:47 pm
Young Cruiser
Join Date: Apr 2010
Posts: 59
Default ac gauges?

Does anyone know how accurate those gauges are that auto part stores sell with the cans of free-on. I had mine checked last year it was fine. This year ac was not working to great went to charge it myself and the gauge said it was in the danger zonw without even puting any im?
Reply With Quote
  #2 (permalink)  
Old 07 Jul 2011, 01:16 pm
Regular Cruiser
Join Date: Jun 2011
Posts: 199
Default Re: ac gauges?

I assume you're talking about the green/yellow/red (good/low/high) gauges, yeah? They are generally functional, but not good. The problem with "repairing" AC using a gauge that only measures from the low pressure side of the system is that it doesn't tell you the whole story, and is only generally (not specifically) applicable to every vehicle.

Each vehicle has specific characteristics, and while R134a has certain performance criteria, what's *perfect* on one vehicle is probably not perfect on another. Additionally, what you see on the low side is only half the story, since you can't see what pressures look like on the high side, and it's the high side that is actually indicative of what's coming out of the vents.

To better deal with AC you need a full set of manifold gauges and a good thermometer. Those are cheap tools that, when used right, will significantly help you do the job - certainly under $100. If you've got a couple post 1996 vehicles they'll pay for themselves within a couple years.

If you're seeing high pressure ("danger") on the low side, it probably means the compressor isn't running. Be sure the AC is on full blast (recirc off, fan on full speed, ac on) with the windows down on a warm day. If you've got all this and are still seeing high pressure on the low side, it *probably* means the compressor isn't doing its job. This is where a real set of gauges becomes useful - without seeing what the high pressure side looks like, it's impossible to make a further diagnosis.
Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Gt Gauges thatsmrjptou Classifieds: For Sale/Trade 1 03 Feb 2010 11:29 am
Can you say Gauges! Wicked_PT General PT Cruiser Discussions 24 23 May 2009 06:15 pm
What three gauges? 340X2C Tech & Performance Forum 2 06 Nov 2008 07:43 pm
Help. Gauges, again Buck Spunni Turbo Performance 0 02 Oct 2003 09:47 am
Add-on Gauges Help 2K1Cruizer Tech & Performance Forum 2 03 Dec 2001 07:42 pm

All times are GMT -5. The time now is 04:50 am.

Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
LinkBacks Enabled by vBSEO 3.6.0 PL2 © 2011, Crawlability, Inc.