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A/C gauge reading question #4474851
07/30/17 04:24 PM
07/30/17 04:24 PM
Joined: Aug 2012
Posts: 24
New Orleans
podan Offline OP
podan  Offline OP
Joined: Aug 2012
Posts: 24
New Orleans
On my 2009 Honda CRV with 95,000 miles...

After a long trip on the interstate (3 hours) I noticed a few drops of water on the passenger floor board. Turns out, all the plastic under that side of the dash was cold and covered in condensation. In fact, the side against the center console was like touching ice. The A/C cools, but is not as cold as it once was. A friend let me borrow his gauges and thermometer. Ambient temp is around 90. With the AC on max and recirculating, temp in the center vent only gets down to 42-44. With the compressor running, the low side shows 35-40 and the high side around 250. The high side needle "wobbles" and the low side one does not.

I am NOT an AC man, and hooking the gauges up is about the extent of my ability with that system. Before I take it to a shop, any insights into what I may be looking at?

Thanks

Re: A/C gauge reading question [Re: podan] #4474855
07/30/17 04:30 PM
07/30/17 04:30 PM
Joined: Aug 2006
Posts: 9,884
Central Washington
Colt45ws Offline
Colt45ws  Offline
Joined: Aug 2006
Posts: 9,884
Central Washington
High side pressure is within reason for the ambient, if not slightly high. Make sure the condenser is clean and the fan is running well.
Low side is perfect. And the vent temperature is good.
If you still think its not cooling as well, you might look for a air flow restriction. Does this vehicle have a cabin filter? If so what is its condition?


-Colton
2002 Ford Crown Vic PI 207k, Ex-Kootenai County, ID Unit #42
Down for engine swap
2003 Ford Crown Vic PI 75k
Castrol EDGE HM 5W30, Fram XG2
Re: A/C gauge reading question [Re: Colt45ws] #4474862
07/30/17 04:41 PM
07/30/17 04:41 PM
Joined: Aug 2010
Posts: 5,940
Champlain/Hudson Valley
Kira Offline
Kira  Offline
Joined: Aug 2010
Posts: 5,940
Champlain/Hudson Valley
I'm an A/C rookie too.
Suggestion: See that your drain pipe is clear. Sounds like (from my HIGHLY LIMITED experience) it's clogged and the condensation tray is full of water.
The evaporator's fins hit the water and chill it. The system has less cold to deliver to the air.

Scold me if I'm wrong.

Re: A/C gauge reading question [Re: podan] #4474863
07/30/17 04:45 PM
07/30/17 04:45 PM
Joined: Jun 2003
Posts: 17,815
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,815
Deplorable in apple valley, ca
The water is condensation. Sounds like the drain is plugged. The wobbling high side is worn pistons or valves in the compressor


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Re: A/C gauge reading question [Re: podan] #4474980
07/30/17 07:32 PM
07/30/17 07:32 PM
Joined: Aug 2012
Posts: 24
New Orleans
podan Offline OP
podan  Offline OP
Joined: Aug 2012
Posts: 24
New Orleans
The cabin air filter is less than 2 months old.

The drain line is open, and a lot of water is draining out of it underneath the vehicle.

I just had front end open, condenser is nice and clean. Electric fans appear to be working well and moving a lot of air.

Re: A/C gauge reading question [Re: podan] #4474990
07/30/17 07:51 PM
07/30/17 07:51 PM
Joined: Mar 2012
Posts: 1,366
San Antonio, TX
E150GT Offline
E150GT  Offline
Joined: Mar 2012
Posts: 1,366
San Antonio, TX
Vent temps at idle seem pretty good. Clean the condenser real good with condenser cleaner. Might bring the high side down a bit. Maybe


1984 Mercedes-Benz 300SD - 100k
1995 F150 XL 4.9 reg cab 5MT - 251k 5w30
2016 Mazda6 Touring 6MT - 57k 10w30
2006 Buick Lucerne CXL 3.8 31k 5w30
Re: A/C gauge reading question [Re: Chris142] #4474998
07/30/17 08:00 PM
07/30/17 08:00 PM
Joined: Dec 2002
Posts: 42,299
New Jersey
JHZR2 Offline
JHZR2  Offline
Joined: Dec 2002
Posts: 42,299
New Jersey
Originally Posted By: Chris142
The water is condensation. Sounds like the drain is plugged. The wobbling high side is worn pistons or valves in the compressor


If OP is really in New Orleans, the humidity there is likely horrid...

Re: A/C gauge reading question [Re: JHZR2] #4475014
07/30/17 08:22 PM
07/30/17 08:22 PM
Joined: Aug 2012
Posts: 24
New Orleans
podan Offline OP
podan  Offline OP
Joined: Aug 2012
Posts: 24
New Orleans
Originally Posted By: JHZR2
Originally Posted By: Chris142
The water is condensation. Sounds like the drain is plugged. The wobbling high side is worn pistons or valves in the compressor


If OP is really in New Orleans, the humidity there is likely horrid...


Yes I really am in New Orleans. Today the humidity was not bad, but it's usually terrible!

Re: A/C gauge reading question [Re: podan] #4475027
07/30/17 08:34 PM
07/30/17 08:34 PM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Since nobody is paying attention to my thread, I'll try the question here:

Ambient Temp: 102.2* F
Vent Temp: 55.6* F
Low Side Pressure: 53 PSI
High Side Pressure: 260 PSI

R143A range at 100* F is supposed to be 50-55 Low 315-325 High

Should I add more refrigerant ?

Re: A/C gauge reading question [Re: Merkava_4] #4475042
07/30/17 08:51 PM
07/30/17 08:51 PM
Joined: Dec 2002
Posts: 42,299
New Jersey
JHZR2 Offline
JHZR2  Offline
Joined: Dec 2002
Posts: 42,299
New Jersey
Originally Posted By: Merkava_4
Since nobody is paying attention to my thread, I'll try the question here:

Ambient Temp: 102.2* F
Vent Temp: 55.6* F
Low Side Pressure: 53 PSI
High Side Pressure: 260 PSI

R143A range at 100* F is supposed to be 50-55 Low 315-325 High

Should I add more refrigerant ?


Because you were asking about vent temperatures in multiple locations, which can be attributed to a lot of things.

What does your FSM say the pressures should be?

Have you evacuated and refilled by mass?

Re: A/C gauge reading question [Re: JHZR2] #4475064
07/30/17 09:09 PM
07/30/17 09:09 PM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Originally Posted By: JHZR2
Because you were asking about vent temperatures in multiple locations, which can be attributed to a lot of things.

What does your FSM say the pressures should be?

Have you evacuated and refilled by mass?


I haven't checked the FSM for the pressures because I didn't know they'd be in there. Just going by the R134A chart. I didn't evacuate it because I didn't open the system up to change parts; I just topped the system off. There are no leaks that I know of. Somebody on here said that the R134A molecule is so small that it eventually works its way through the rubber hoses.

Re: A/C gauge reading question [Re: podan] #4475314
07/31/17 07:35 AM
07/31/17 07:35 AM
Joined: Dec 2006
Posts: 8,027
Canuck living in California
KrisZ Online content
KrisZ  Online Content
Joined: Dec 2006
Posts: 8,027
Canuck living in California
The evaporator might be icing up. When it does it affects the vent air flow. Low charge can cause the evaporator to ice up.


2015 Dodge Grand Caravan-27k miles.
2006 Mazda 3-163k miles
Re: A/C gauge reading question [Re: podan] #4475432
07/31/17 09:26 AM
07/31/17 09:26 AM
Joined: Jun 2005
Posts: 5,277
North Texas
ARB1977 Offline
ARB1977  Offline
Joined: Jun 2005
Posts: 5,277
North Texas
Following this thread. Our 08 is having issues only in traffic or a long stop light when the ac doesn't work. At speed works fine.


2015 Tacoma 4.0L 60K (as of 02/23/18)
AMSOIL SS 0W30 / Toyota filter

2018 CRV 1.5L (as of 05/11/18)
Factory fill / Honda filter
Re: A/C gauge reading question [Re: podan] #4475433
07/31/17 09:29 AM
07/31/17 09:29 AM
Joined: Jun 2003
Posts: 5,951
Illinois
SHOZ Offline
SHOZ  Offline
Joined: Jun 2003
Posts: 5,951
Illinois
What are the readings at a faster rpm, say 1500?


2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual

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