1997 Sebring 2.5L A/C warm (details inside)

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

Moderators: bohica2xo, Tim, Dougflas, HECAT

sgreiner1011
Posts: 6
Joined: Thu Aug 17, 2017 5:07 pm

1997 Sebring 2.5L A/C warm (details inside)

Postby sgreiner1011 » Thu Aug 17, 2017 8:40 pm

Hi All,

I have worked on A/C systems in the past, but I never saw the following issue before... The A/C suddenly stopped working so it wasn't gradual. The A/C blows warm and its the same temp as the outside air. The A/C clutch does engage and stays engaged. The low line DOES NOT get cold, but the high line DOES get hot. I hooked up the my gauges and without the engine running, the low pressure and high pressure are about equal at 100psi. When the engine/compressor is running, the low goes to about 35 and the high to about 175 and stays there constantly. The compressor never turns off. There are no leaks.

Could this be an expansion valve issue where its stuck closed since it just suddenly stopped? (I don't think this system has an orifice tube)

Please Help,
Thanks
GM Tech
Posts: 145
Joined: Fri Apr 22, 2016 7:22 am

Re: 1997 Sebring 2.5L A/C warm (details inside)

Postby GM Tech » Fri Aug 18, 2017 3:52 am

Make sure your temp doors are working- go to full heat and full cold see if there is a differential. At 35 psi lo side- you should have cold return lines to compressor and cooling inside evap.
User avatar
Cusser
Posts: 278
Joined: Sun Apr 24, 2016 6:29 am

Re: 1997 Sebring 2.5L A/C warm (details inside)

Postby Cusser » Fri Aug 18, 2017 8:18 am

sgreiner1011 wrote:When the engine/compressor is running, the low goes to about 35 and the high to about 175 and stays there constantly. The compressor never turns off.


What rpm are those pressures measured? Should be like 1800 rpm.


sgreiner1011 wrote:There are no leaks.


Hmmm - "famous last words". 175 is low for high side pressure measured at 1800 rpm, you should next have the refrigerant pulled out and weighed, I suspect a leak. Leaks can even occur from bad service valve caps.
sgreiner1011
Posts: 6
Joined: Thu Aug 17, 2017 5:07 pm

Re: 1997 Sebring 2.5L A/C warm (details inside)

Postby sgreiner1011 » Sat Aug 19, 2017 12:54 am

Make sure your temp doors are working- go to full heat and full cold see if there is a differential. At 35 psi lo side- you should have cold return lines to compressor and cooling inside evap.

Yes, I failed to mention this. The air is a lot hotter when I have it at full heat. When I have it on cool, the air temp is the same as the outside air.

What rpm are those pressures measured? Should be like 1800 rpm.

I think I tested at 1500 RPM for the pressures I mentioned. I am going to hook up the gauges again once I get the time (within a week or so). Now that I think about it, I may not have told you the right pressures. Those pressures may have been at idle. I'm suffering from CRS in my old age.

Hmmm - "famous last words". 175 is low for high side pressure measured at 1800 rpm, you should next have the refrigerant pulled out and weighed, I suspect a leak. Leaks can even occur from bad service valve caps.

Yeah I know about those words...LOL... Will a small leak cause the system to suddenly stop working?

I will be working on this car again within a week or so, I will post back. Maybe it will be sooner because its my daughter's car and we live in Phoenix where the temp is above 100 almost consistently...LOL
User avatar
Cusser
Posts: 278
Joined: Sun Apr 24, 2016 6:29 am

Re: 1997 Sebring 2.5L A/C warm (details inside)

Postby Cusser » Sat Aug 19, 2017 8:12 am

sgreiner1011 wrote:I will be working on this car again within a week or so, I will post back. Maybe it will be sooner because its my daughter's car and we live in Phoenix where the temp is above 100 almost consistently...LOL


Yep, I'm longtime Phoenix resident, now split time with cooler Prescott area....pretty unbearable down there ! "Love" those times when temperature is still 100F at midnight, or the "low" is 94F at 5:30am.....
User avatar
Tim
Site Admin
Posts: 192
Joined: Tue Apr 12, 2016 2:19 pm
Location: Scottsdale, Arizona
Contact:

Re: 1997 Sebring 2.5L A/C warm (details inside)

Postby Tim » Sat Aug 19, 2017 11:40 am

Cusser wrote:
sgreiner1011 wrote:I will be working on this car again within a week or so, I will post back. Maybe it will be sooner because its my daughter's car and we live in Phoenix where the temp is above 100 almost consistently...LOL


Yep, I'm longtime Phoenix resident, now split time with cooler Prescott area....pretty unbearable down there ! "Love" those times when temperature is still 100F at midnight, or the "low" is 94F at 5:30am.....


When and if I ever get past this kidney issue. I really want to move to Prescott.
------------------------------
Please support ACKITS.com for your Auto A/C Parts and Tool needs.
P:602-233-0090
ice-n-tropics
Posts: 50
Joined: Sat Apr 23, 2016 3:40 pm

Re: 1997 Sebring 2.5L A/C warm (details inside)

Postby ice-n-tropics » Mon Aug 21, 2017 10:11 am

One potential root cause is that the single discharge valve of the scroll compressor is not fully closing which allows warm high discharge gas in the rear discharge chamber to re enter the scroll area. This is referred to as wire drawing and could be foreign material under the valve seat, cracked discharge flapper leaf spring valve material or a loose valve mounting bolt. The result is very little refrigerant mass flow and occasional clutch cycling due to thermal protection switch cycling at higher rpm.
A less likely cause is the fixed rear scroll o ring bypasses discharge gas into the scroll entry low pressure chmber.
hotrodac
sgreiner1011
Posts: 6
Joined: Thu Aug 17, 2017 5:07 pm

Re: 1997 Sebring 2.5L A/C warm (details inside)

Postby sgreiner1011 » Wed Aug 23, 2017 3:30 pm

Dug more into it, and at 1800 RPM, the low side goes really low to 5psi and stays there forever. The high side goes from 150 to about 155 or so and stays there. The compressor still runs constantly. At idle and static, the pressures are still the same as I mentioned before.

I'm thinking expansion valve... Thoughts?
sgreiner1011
Posts: 6
Joined: Thu Aug 17, 2017 5:07 pm

Re: 1997 Sebring 2.5L A/C warm (details inside)

Postby sgreiner1011 » Sat Aug 26, 2017 1:39 am

Expansion Valve? Anybody want to give their thoughts? Vacuum on low end? Virtually no change on high side?
User avatar
bohica2xo
Posts: 276
Joined: Wed May 11, 2016 4:12 pm
Location: Las Vegas, NV

Re: 1997 Sebring 2.5L A/C warm (details inside)

Postby bohica2xo » Sat Aug 26, 2017 10:18 am

Is it an LX or JX model?

Recovering & inspecting the Expansion valve is the place to start with the low side dropping like that.

Return to “Automotive Air Conditioning Forum”