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#2224116 - 04/06/11 06:02 PM Can smell freon (134) in my cab of truck.
lifeson2112 Offline


Registered: 01/12/11
Posts: 78
Loc: Texas
1992 Silverado, 305...150,000 miles. Switched on AC the other day, and it did not get cold. The "AC" led was blinking, I assume indicating it was in distress of some sort. Ive had the truck 4 years, cold AC every summer, but now I guess thats out the window. Anyway...I started smelling freon in the cab and when I opened the hood, I again smelled it. You cant miss that smell, it stinks bad. Besides repairing, besides refilling, what can I do stop the the smell? It cant be good to breath this stuff. Truck got "totaled" by ins. compnay last week, but runs and drives, so its hardly worth putting any real bucks into it. Thanks.

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#2224183 - 04/06/11 06:56 PM Re: Can smell freon (134) in my cab of truck. [Re: lifeson2112]
Chris142 Offline


Registered: 06/05/03
Posts: 14848
Loc: apple valley, ca
R12 and R134a Have no smell.
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#2224185 - 04/06/11 07:00 PM Re: Can smell freon (134) in my cab of truck. [Re: Chris142]
gathermewool Offline


Registered: 01/09/09
Posts: 4982
Loc: New England
Originally Posted By: Chris142
R12 and R134a Have no smell.


+1 It wasn't R134a you smelled.
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#2224189 - 04/06/11 07:02 PM Re: Can smell freon (134) in my cab of truck. [Re: lifeson2112]
dave munson Offline


Registered: 10/08/05
Posts: 111
Loc: Illinois
Fix it. Leave it. It is kind of rough that you don't feel it is worth the effort to keep it running but don't whine. Add some freon and see if it leaks again. It it does, either put another can in or ignore it and hope the pump don't seize up.
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#2224192 - 04/06/11 07:10 PM Re: Can smell freon (134) in my cab of truck. [Re: lifeson2112]
Quattro Pete Offline


Registered: 10/30/02
Posts: 33259
Loc: Great Lakes
Is it an A/C belt that's slipping that's generating the smell?
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#2224193 - 04/06/11 07:11 PM Re: Can smell freon (134) in my cab of truck. [Re: lifeson2112]
exranger06 Offline


Registered: 01/25/08
Posts: 3510
Loc: Guilford, CT
R134a DOES have a smell. I smelled it a lot when I was fixing my Explorer's AC. If you smell it inside the cab, my guess would be a bad evaporator.
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#2224214 - 04/06/11 07:23 PM Re: Can smell freon (134) in my cab of truck. [Re: exranger06]
gathermewool Offline


Registered: 01/09/09
Posts: 4982
Loc: New England
Originally Posted By: exranger06
R134a DOES have a smell. I smelled it a lot when I was fixing my Explorer's AC. If you smell it inside the cab, my guess would be a bad evaporator.


The odor is so light that usually, and especially in older equipment, the odor of whatever the refrigerant is blowing past will mask the smell of the refrigerant itself. It by no means stinks. Stinky usually means organics getting too hot, like rubber belts or clutches.
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#2224273 - 04/06/11 08:03 PM Re: Can smell freon (134) in my cab of truck. [Re: exranger06]
Chris142 Offline


Registered: 06/05/03
Posts: 14848
Loc: apple valley, ca
Originally Posted By: exranger06
R134a DOES have a smell. I smelled it a lot when I was fixing my Explorer's AC. If you smell it inside the cab, my guess would be a bad evaporator.
You were smelling the odor that Pag oil has.
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#2224771 - 04/07/11 09:39 AM Re: Can smell freon (134) in my cab of truck. [Re: lifeson2112]
rcy Offline


Registered: 02/14/04
Posts: 1592
Loc: Burlington, Ontario, Canada
When my 1999 Dodge Grand Caravan ended up with a leaking evaporator (these things were almost guaranteed to leak...thank you Chrysler), the smell from the vents reminded me of the smell of a box of band-aids...really.

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#2225190 - 04/07/11 04:29 PM Re: Can smell freon (134) in my cab of truck. [Re: lifeson2112]
mechtech2 Offline


Registered: 09/05/06
Posts: 19479
Loc: Chicago Area
I never noted a smell of R12 or R123a, either.
I don't think they have a smell.

So you have a smell from a totaled car?
Coolant or oil on the hot exhaust is more likely.
And on that totaled car, don't you think that you may have more that one problem?

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#2225531 - 04/07/11 09:18 PM Re: Can smell freon (134) in my cab of truck. [Re: Chris142]
ComfyShorts Offline


Registered: 04/26/10
Posts: 178
Loc: California
Originally Posted By: Chris142
Originally Posted By: exranger06
You were smelling the odor that Pag oil has.



DING DING DING. r134a has no smell. Its the pag oil you're smelling. And yes likely issue at the evaporator/connections to. AC systems have pressure switches, if you have a leak once pressure drops below certain amount it will force compressor clutch from engaging to avoid damage to compressor.

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#2226016 - 04/08/11 11:24 AM Re: Can smell freon (134) in my cab of truck. [Re: Chris142]
OilNerd Offline


Registered: 09/14/09
Posts: 1235
Loc: Plattsburgh, NY
Originally Posted By: Chris142
R12 and R134a Have no smell.


R134a has no smell? A slight smell, yes; odorless, no. Here are two MSDS sheets from DuPont and National Refrigerants.

Originally Posted By: DuPont SUVA 134a MSDS
SECTION 9. PHYSICAL AND CHEMICAL PROPERTIES
Form : Liquefied gas
Color : colourless
Odor : slight, ether-like


http://msds.dupont.com/msds/pdfs/EN/PEN_09004a35804fa7ff.pdf

Originally Posted By: National Refrigerants MSDS
EMERGENCY OVERVIEW: Colorless, volatile liquid with ethereal and faint sweetish odor.


http://ww2.ramapo.edu/libfiles/HR/Environmental_Health_and_Safety/MSDS/Facilities/HVAC/134a.pdf


Edited by OilNerd (04/08/11 11:27 AM)
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