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#4478555 - 08/03/17 08:29 PM Evap core freezing up?
HoosierJeeper Offline


Registered: 11/23/16
Posts: 1276
Loc: WI
Just got back from a roundtrip to Memphis with my LR3. On the way back today, I noticed that after about 5-6 hours of solid driving with the AC on and recirc on, it didn't feel like there was the normal volume of air coming out. I turned off recirc (for the rest of the trip), and then turned the AC off for about 5 mins and then stopped for gas. It was perfect after that, lots of water was dripping out. Then again just as I neared home (about 5-6 hours later) it started feeling a bit clogged again. Temps where in the 80s most of the way and then in the 60s once I got back into Wisconsin. Is this normal? It was about 12 hours of continuous driving, with maybe 3 10 minute breaks to get gas. Never have driven that continuously before. AC still blew cold, as cold as ever. Seemed fine on the way there last week. Don't think it's low on charge. FWIW, it's never had AC work done and I've never swapped the cabin air filter. Is this something to worry about?

Thanks!
_________________________
15 Jeep KL Limited V6: Formula Shell 5W20
07 LR3 SE V8: Maxlife 5W30
05 Jeep KJ Limited: PHM 5W30
96 Jeep XJ Country: STP HM 5W30 (winter)

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#4478563 - 08/03/17 08:45 PM Re: Evap core freezing up? [Re: HoosierJeeper]
Leo99 Offline


Registered: 03/30/14
Posts: 3041
Loc: NJ
No expert here but I think you've diagnosed it. I wouldn't worry about it.
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#4478575 - 08/03/17 09:08 PM Re: Evap core freezing up? [Re: HoosierJeeper]
Brad_C Offline


Registered: 07/27/12
Posts: 617
Loc: Perth, Western Australia
The LR3 has a high side pressure sensor and an evaporator temperature thermistor. It's a TXV with variable displacement compressor and a fairly impressive control system. If it iced up it should throw a code on the ATCM. Know anyone with a Ford T4 compatible scanner than can get a code from there?

If you've never had it re-gassed it would be worth getting the residual charge size measured, but I've got nothing else to contribute. With the control system that car has a plugged cabin air filter shouldn't be an issue.
If the charge was low enough to cause icing, it should be fairly noticeably impacting your day to day cooling though.

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#4478576 - 08/03/17 09:09 PM Re: Evap core freezing up? [Re: HoosierJeeper]
danez_yoda Offline


Registered: 07/18/09
Posts: 464
Loc: texas
Dont know about a car but the evaporator core freezing in a house is usually a sign it is low on refrigerant.

Also check you cabin air filter, If it is clogged it could restrict the air flow.

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#4478593 - 08/03/17 09:29 PM Re: Evap core freezing up? [Re: Brad_C]
HoosierJeeper Offline


Registered: 11/23/16
Posts: 1276
Loc: WI
Originally Posted By: Brad_C
The LR3 has a high side pressure sensor and an evaporator temperature thermistor. It's a TXV with variable displacement compressor and a fairly impressive control system. If it iced up it should throw a code on the ATCM. Know anyone with a Ford T4 compatible scanner than can get a code from there?

If you've never had it re-gassed it would be worth getting the residual charge size measured, but I've got nothing else to contribute. With the control system that car has a plugged cabin air filter shouldn't be an issue.
If the charge was low enough to cause icing, it should be fairly noticeably impacting your day to day cooling though.


That's what I was thinking about it being low...it should be warm. It's still very cold and if there's anything I notice in a vehicle, it's AC lol.
_________________________
15 Jeep KL Limited V6: Formula Shell 5W20
07 LR3 SE V8: Maxlife 5W30
05 Jeep KJ Limited: PHM 5W30
96 Jeep XJ Country: STP HM 5W30 (winter)

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#4478606 - 08/03/17 09:38 PM Re: Evap core freezing up? [Re: HoosierJeeper]
JamesBond Offline


Registered: 12/13/06
Posts: 843
Loc: midwest
You've never changed the cabin air filter??

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#4478609 - 08/03/17 09:39 PM Re: Evap core freezing up? [Re: HoosierJeeper]
SHOZ Offline


Registered: 06/28/03
Posts: 5744
Loc: Illinois
Should be a temp sensor on the evap core to keep it above 35F.
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#4478627 - 08/03/17 10:00 PM Re: Evap core freezing up? [Re: HoosierJeeper]
HoosierJeeper Offline


Registered: 11/23/16
Posts: 1276
Loc: WI
Forgot it had a cabin air filter till today and I'll look into the temp sensor. Thanks for the help so far, still listening to all of the advice!
_________________________
15 Jeep KL Limited V6: Formula Shell 5W20
07 LR3 SE V8: Maxlife 5W30
05 Jeep KJ Limited: PHM 5W30
96 Jeep XJ Country: STP HM 5W30 (winter)

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#4478692 - 08/04/17 01:32 AM Re: Evap core freezing up? [Re: HoosierJeeper]
DoubleWasp Offline


Registered: 05/21/12
Posts: 5236
Loc: Fort Lauderdale, FL
Bet it's clogged cabin filter.
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#4478698 - 08/04/17 02:45 AM Re: Evap core freezing up? [Re: HoosierJeeper]
NoNameJoe Offline


Registered: 06/03/15
Posts: 414
Loc: New York
Lack of airflow would probably result in the evaporator icing up as would a low charge. Cabin air filter would probably be easiest to check (depends on car really).

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#4478727 - 08/04/17 05:35 AM Re: Evap core freezing up? [Re: HoosierJeeper]
demarpaint Offline


Registered: 07/03/05
Posts: 29757
Loc: NY
Usually it's caused from a lack of airflow. I'd check the cabin air filter and clean the housing where it sits out real good. I'd also check the condenser and make sure that's nice and clean, probably not the cause of the problem but often neglected. Next in line would be the refrigerant charge.
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#4478795 - 08/04/17 07:28 AM Re: Evap core freezing up? [Re: HoosierJeeper]
mk378 Online   content


Registered: 09/27/15
Posts: 1417
Loc: USA
Lack of charge will not cause freeze-up in an auto system. They have different controls than home systems.

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#4478839 - 08/04/17 08:38 AM Re: Evap core freezing up? [Re: HoosierJeeper]
SHOZ Offline


Registered: 06/28/03
Posts: 5744
Loc: Illinois
If the settings are in recirc the cabin filter is out of the equation.
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2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual

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#4478877 - 08/04/17 09:16 AM Re: Evap core freezing up? [Re: HoosierJeeper]
HoosierJeeper Offline


Registered: 11/23/16
Posts: 1276
Loc: WI
Going to change the cabin filter.

And it was in recirc for the first part, then I stopped using recirc and it still did it FWIW.
_________________________
15 Jeep KL Limited V6: Formula Shell 5W20
07 LR3 SE V8: Maxlife 5W30
05 Jeep KJ Limited: PHM 5W30
96 Jeep XJ Country: STP HM 5W30 (winter)

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#4478912 - 08/04/17 10:24 AM Re: Evap core freezing up? [Re: HoosierJeeper]
HoosierJeeper Offline


Registered: 11/23/16
Posts: 1276
Loc: WI
Pulled the old cabin filter out and it's nasty. It's damp too. Is that normal?
_________________________
15 Jeep KL Limited V6: Formula Shell 5W20
07 LR3 SE V8: Maxlife 5W30
05 Jeep KJ Limited: PHM 5W30
96 Jeep XJ Country: STP HM 5W30 (winter)

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