PT Cruiser Forum  
Advertisements
       

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

PT Cruiser Forum

Advertisements
Why is my ac so inconsistant? Is there a way to make it colder?

 
Reply
 
LinkBack Thread Tools Display Modes
  #1 (permalink)  
Old 13 Jun 2009, 06:06 pm
Cool Cruiser
 
Join Date: Jun 2009
Posts: 257
Default Why is my ac so inconsistant? Is there a way to make it colder?

The ac in my PT is SO damn inconsistant. Throughout the day, during one trip the ac will be so cold the grips on my steering wheel are frozen. Then later that day on another trip, the ac will barely even phase the steering wheel..

What gives? This is annoying that sometimes I need to have my ac cranked the whole trip home, and other times on low the ac will suffice.


Also, is there something I can do to make the ac colder and more efficient?

Matt
__________________
Silver 2002 pt cruiser touring edition, auto, dark ass tint, 89k miles... shift burp mod, SRI

2005 civic ex special edition, 5spd, fully loaded, 40k miles

I have a wide-band o2 sensor for sale!! PM ME!!
Reply With Quote
  #2 (permalink)  
Old 13 Jun 2009, 08:58 pm
Young Cruiser
 
Join Date: Oct 2008
Location: NAPLES, FLORIDA
Posts: 69
Default Re: Why is my ac so inconsistant? Is there a way to make it colder?

It may not seem logical, but when your freon charge gets too low the evaporator gets colder. In fact it will freeze up preventing air to pass. It stays super cold until the evaporator freezes. Have your freon charge checked.
When the freon eventually gets low enough you will get no cold air. Another possibility is that the clutch on your compress is not operating properly.
Reply With Quote
  #3 (permalink)  
Old 13 Jun 2009, 10:18 pm
Cool Cruiser
 
Join Date: Jun 2009
Posts: 257
Default Re: Why is my ac so inconsistant? Is there a way to make it colder?

I'm fairly certain the clutch is operating fine.

So what your saying is I'm low on freon? I have a do it yourself recharge kit, I just need to buy more freon. I usually charge them to the upper spectrum of "full" just to be safe. But why will the ac all of a sudden start pumping out super cold? Could the underhood heat be warming it up or something?
__________________
Silver 2002 pt cruiser touring edition, auto, dark ass tint, 89k miles... shift burp mod, SRI

2005 civic ex special edition, 5spd, fully loaded, 40k miles

I have a wide-band o2 sensor for sale!! PM ME!!
Reply With Quote
  #4 (permalink)  
Old 14 Jun 2009, 08:02 am
Young Cruiser
 
Join Date: Oct 2008
Location: NAPLES, FLORIDA
Posts: 69
Default Re: Why is my ac so inconsistant? Is there a way to make it colder?

Automobile AC is not a hermatically sealed unit as is in home AC. The compressor is driven by an external source.
The compressor has end seals that keep the freon from escaping. These seals are not perfect. The have infinately slow leeks. Usually seal loss is not a problem for years. However, eventually enough freon will be lost to effect the AC performance. This is normal.
The charge of you AC is at a precise level, without too much error for under/over filling. Do it your self kits are at best a crap shoot. Proper charging requires: adding a dye to check for leaks, evacuation of the system, recharging with a precision weighed amount of freon, making sure refigerant oil levels are correct.
Automitive AC is not for home shade mechanics. Bite the bullet and find a shop that only works on automotive AC.
If they try to sell you a compressor, get a second opinion.
Reply With Quote
  #5 (permalink)  
Old 15 Jun 2009, 10:25 pm
Cool Cruiser
 
Join Date: Nov 2007
Posts: 394
Default Re: Why is my ac so inconsistant? Is there a way to make it colder?

Quote:
I usually charge them to the upper spectrum of "full" just to be safe.
This is a common mistake. By overcharging - (and the "full" spectrum is simply a guess) - you actually make the A/C work less efficiently.

HVAC basically works like this: compressor compresses freon vapor into the condensor coils where it goes back to liquid. Its quite hot from this and the fan runs to cool that off. Once cooler - it gets to the orifice valve in the evaporator core, where it greatly expands and gets much colder in the process. Your blower motor impels air through those coils to cool your car. However the whole system is more or less sealed. So you have your low side pressure, and your high side pressure. If the low side pressure is slightly higher than stock - that means there is less room for the freon to expand. It will only serve to increase high side pressure as well. Normally the system cycles by getting to a low pressure point. Oftentimes with too much freon that never happens and instead the high pressure is tripped. The user checks with a gauge - its within the "full" section so they are lost.

By adding more freon than specified - you are actually reducing the cooling effect of the system.

In addition most home refill kits only check low pressure and are only a ballpark figure. Those pressure gauges are CHEAP!

A proper HVAC mech will have both gauges and will know to adjust for temperature changes as well as the temp of the engine bay.

I don't recall the number off the top of my head but you can find it in the service manual linked at the top of this forum. I recall that on my own "refill kit" that the actual pressure specified in the manual was in the "recharge" segment of the gauge.

So if you must do it yourself, borrow a set of gauges that actually work, and read the manual for the proper pressures. Don't trust that bottle gauge at all.
Reply With Quote
  #6 (permalink)  
Old 16 Jun 2009, 06:53 am
Cool Cruiser
 
Join Date: Jun 2009
Posts: 257
Default Re: Why is my ac so inconsistant? Is there a way to make it colder?

Good information.. thank you. How much would a shop charge for all this? Probably quite a bit...
__________________
Silver 2002 pt cruiser touring edition, auto, dark ass tint, 89k miles... shift burp mod, SRI

2005 civic ex special edition, 5spd, fully loaded, 40k miles

I have a wide-band o2 sensor for sale!! PM ME!!
Reply With Quote
  #7 (permalink)  
Old 30 Jul 2013, 03:28 pm
Fresh Cruiser
 
Join Date: Jul 2013
Location: Sunny FLA
Posts: 3
Default Re: Why is my ac so inconsistant? Is there a way to make it colder?

I can't believe that this summer nearly every state has reached 90 degrees at some point, especially in the northeast! I live in Florida so I'm used to the temperatures to a certain degree (ha), but this year has been especially hot. And to top it all off my car AC just did not seem to be blowing as cold as it did last year. I had it checked out by a mechanic friend and they said it was fully charged, so there was nothing they could do. Luckily, I came across this new product called QuickCool AC and gave it a try. Once we added it to my car I could feel the difference instantly (their website wasn't kidding!), I didn't have a thermometer to test but I'm sure it's gotten at least 10-15 degrees colder now, and it cools off much faster when I start my car so I don't have to wait as long to cool off when it's been sitting in a parking lot all day. Here is their website if you want to take a look: QuickCool AC- I can attest it works great.
Reply With Quote
  #8 (permalink)  
Old 30 Jul 2013, 04:45 pm
Obsessed Cruiser
 
Join Date: Sep 2001
Posts: 27,743
Default Re: Why is my ac so inconsistant? Is there a way to make it colder?

DMorgan, usually a first time poster isn't throwing in an advertisement (first hand experience) of a product unless he/she has some ulterior motive, like working or owning a business associated with what's been posted.

Please take the time to introduce yourself to the rest of the forum in the WELCOME section. Tell us if you even own a PT Cruiser and please fill out your profile.

Meanwhile, anyone reading the above post, try it at your own risk.
Reply With Quote
  #9 (permalink)  
Old 31 Jul 2013, 01:13 pm
Fresh Cruiser
 
Join Date: Jul 2013
Location: Sunny FLA
Posts: 3
Default Re: Why is my ac so inconsistant? Is there a way to make it colder?

So sorry! Will do. Also galvanizedyankee is correct, the charge is best at a specific level and if you overcharge the refrigerant (freon) it's just as bad as undercharged. Leaks also can cause the A/C to blow warmer.

Auto shops will charge a wide variety of prices for an A/C tune up, but the beginning of the summer usually brings better deals/coupons.

QuickCool isn't meant for A/Cs that need tune ups... if you have tried everything else and it's still not really that cold, something like Quick cool should do the trick. There is another brand out there with a similar product, AC Pro, but I have not used that and it's not quite the same thing I think -- it's more of a charger than an additive.

Quote:
Originally Posted by CREWZIN View Post
DMorgan, usually a first time poster isn't throwing in an advertisement (first hand experience) of a product unless he/she has some ulterior motive, like working or owning a business associated with what's been posted.

Please take the time to introduce yourself to the rest of the forum in the WELCOME section. Tell us if you even own a PT Cruiser and please fill out your profile.

Meanwhile, anyone reading the above post, try it at your own risk.
Reply With Quote
Reply


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



All times are GMT -5. The time now is 06:10 am.




Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
LinkBacks Enabled by vBSEO 3.6.0 PL2 © 2011, Crawlability, Inc.
vB.Sponsors