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#4785923 - 06/13/18 01:43 PM Insulating Vehicle A/C Lines
ad244 Offline


Registered: 08/10/17
Posts: 53
Loc: CA
Since summer is upon us her ein the Northern Hemisphere, its A/C Season. Not saying the A/c system in my Tacoma is inferior and was charged last weekend but I was wondering if anybody on here has had any experience insulating the A/C lines under the hood?

I know in Home HVAC systems, the lines which run between the pump and the wall of the dwelling are oftentimes insulated perhaps keeping some of the cold lines "colder"? Since the cold lines run through the Hot engine compartment, would insulating the lines further help keep them cooler?

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#4785931 - 06/13/18 01:55 PM Re: Insulating Vehicle A/C Lines [Re: ad244]
Pike51 Offline


Registered: 07/09/17
Posts: 96
Loc: GA
It is not generally recommended. Info below taken from Stack Exchange because they explain it better than I can.

1. The cold side of the piping is after the evaporator, headed back to the compressor. Any loss here will not make a difference in the overall performance or efficiency of your AC unit.

2. Since the system is designed without the insulation, it may actually be detrimental to some of the working parts for it to be colder (may cause freezing of moving parts/evaporator). Engineers have taken all of this into account when designing the AC unit in the first place

3. Remember in order for condensation to form on this pipe it only has to meet two conditions: 1) pipe has to be cooler than the dew point; 2) there has to be humidity in the air. These conditions are very easily met in most situations.

Vehicle AC units are work pretty darn well considering what they have to do and the amount and quickness of cooling they have to do. Why mess with success. If you do, you could be introducing dynamics into the system they weren't designed for and you won't being doing much to improve the efficiency
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#4785936 - 06/13/18 02:13 PM Re: Insulating Vehicle A/C Lines [Re: ad244]
bullwinkle Online   confused


Registered: 10/09/04
Posts: 7839
Loc: Cincinnati, OH, USA
I would think there would be a risk of "slugging" the compressor with liquid refrigerant, likely damaging it. Unlike a hermetic or scroll A/C compressor, an automotive compressor can't take any liquid returning, at all.
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#4785937 - 06/13/18 02:14 PM Re: Insulating Vehicle A/C Lines [Re: ad244]
kschachn Online   content


Registered: 12/26/05
Posts: 9702
Loc: Upper Midwest
Originally Posted By: ad244
I know in Home HVAC systems, the lines which run between the pump and the wall of the dwelling are oftentimes insulated perhaps keeping some of the cold lines "colder"? Since the cold lines run through the Hot engine compartment, would insulating the lines further help keep them cooler?

The "coldness" of the lines is immaterial for the most part. The smaller high pressure liquid line coming from the condenser is warm, you want it to reject heat if possible before it reaches the evaporator. The low pressure gas line from the evaporator to the compressor (the one that's insulated in your house and often in a car) really doesn't go that far and thermodynamically it won't make much difference when it comes to affecting the output temperature at the compressor. What insulation may already be on there is sufficient.
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#4785964 - 06/13/18 03:01 PM Re: Insulating Vehicle A/C Lines [Re: ad244]
JLTD Offline


Registered: 12/15/17
Posts: 942
Loc: US
On several of the Ford F150 sites, I've read where folks have insulated the cold side and increased the performance of the system, without any detrimental effects.
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#4785969 - 06/13/18 03:11 PM Re: Insulating Vehicle A/C Lines [Re: ad244]
KrisZ Offline


Registered: 12/23/06
Posts: 7566
Loc: Toronto, Canada
Lines in home HVAC systems are insulated, notice only the cold line is, so that condensation doesn't accumulate on the lines and start dripping inside the house. No such requirement for vehicles
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#4785998 - 06/13/18 03:55 PM Re: Insulating Vehicle A/C Lines [Re: ad244]
Miller88 Offline


Registered: 04/09/08
Posts: 12806
Loc: Onondaga County
Seems like it would promote rust under the insulation ...
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#4786010 - 06/13/18 04:08 PM Re: Insulating Vehicle A/C Lines [Re: ad244]
Chris142 Online   content


Registered: 06/05/03
Posts: 17151
Loc: Deplorable in apple valley, ca
Those trucks normally work well. Something is wrong with yours. Was it charged by weight or some yahoo with guages and a can? Is the heater valve shutting the water off to the heater completely? Bad compressor or expansion valve?
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#4786020 - 06/13/18 04:24 PM Re: Insulating Vehicle A/C Lines [Re: ad244]
nthach Offline


Registered: 01/02/04
Posts: 4080
Loc: California
Mercedes used to insulate the AC lines in the 1980s-1990s with Armstrong Tubolit insulation, which I believe Armaflex at the local big box is the successor to that.

I don't think it'll hurt, if anything it might protect the hard lines from chafing.

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#4786025 - 06/13/18 04:30 PM Re: Insulating Vehicle A/C Lines [Re: ad244]
henni Offline


Registered: 12/28/11
Posts: 318
Loc: key largo,fl
One benefit to insulating a portion of the line from firewall (..only part of the line run...) is to stop condesate from the sweating line dripping onto belt(s) and slinging droplets all over. Would not otherwise care and system does not need it. On smaller Honda engines, this resulted in considerable difference in accumulating dirt on the sound insulation material under the hood.
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#4786178 - 06/13/18 07:42 PM Re: Insulating Vehicle A/C Lines [Re: nthach]
JHZR2 Offline



Registered: 12/14/02
Posts: 41988
Loc: New Jersey
Originally Posted By: nthach
Mercedes used to insulate the AC lines in the 1980s-1990s with Armstrong Tubolit insulation, which I believe Armaflex at the local big box is the successor to that.

I don't think it'll hurt, if anything it might protect the hard lines from chafing.


I was just about to say this!

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#4786179 - 06/13/18 07:44 PM Re: Insulating Vehicle A/C Lines [Re: ad244]
Eddie Offline


Registered: 12/07/03
Posts: 9737
Loc: Florida, Cape Coral
I bought pipe insulation from Home Depot and insulate the cold line in all my vehicles. On a 2007 Mazda I compared the un-insulated center vent out put temp vs insulated. The insulation helped the center vent temp by lowering the temp 2.5 F. measured with an accurate Digital thermometer. A worthwhile thing to do here in SW Florida. Ed
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#4786228 - 06/13/18 08:34 PM Re: Insulating Vehicle A/C Lines [Re: ad244]
AVB Offline


Registered: 05/20/12
Posts: 1391
Loc: Georgia
Chrysler actually started running a section of the high side line inside of the low side line. They decided cooling the high side was more important. They call it a internal heat exchanger.


Edited by AVB (06/13/18 08:39 PM)

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#4786230 - 06/13/18 08:37 PM Re: Insulating Vehicle A/C Lines [Re: Eddie]
bbhero Offline


Registered: 03/20/15
Posts: 4842
Loc: Virginia
Great job Eddie. Very smart.
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#4786241 - 06/13/18 08:54 PM Re: Insulating Vehicle A/C Lines [Re: bullwinkle]
jhellwig Offline


Registered: 07/01/13
Posts: 1600
Loc: Ottumwa, Iowa
Originally Posted By: bullwinkle
I would think there would be a risk of "slugging" the compressor with liquid refrigerant, likely damaging it. Unlike a hermetic or scroll A/C compressor, an automotive compressor can't take any liquid returning, at all.


Considering the fact that oil and liquid refrigerant are added to the return line that is impossible.


The dryer/accumulator on my 95 Suburban was insulated from the factory.



On a side note I blew the thrust bearing out of a 2000hp turbin compressor chiller when I restarted it without water flow through the evaporator. The tech had recommissioned it but not run it but left the compressor thrusted out of center. He told me how to reset it over the phone but didn’t remember that the valve was closed on the chilled water return till it went bang. So you can get the systems to cold.


Edited by jhellwig (06/13/18 09:03 PM)
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