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Blew AC Hose While Stopped
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Wolfram
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PostPosted: Wed Jul 05, 2017 8:46 pm    Post subject: Blew AC Hose While Stopped Reply with quote

Drove up from Terrebonne, OR to The Dalles and was having lunch at a city park. Boom!. Really loud sound from LR of van. Oh shit moment as I thought; propane, coolant, tire...
It was the high pressure AC line retiring after 29 years and spewing R134 and fluorescent dye allover the engine compartment.

Phew.
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Guybrush
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PostPosted: Wed Jul 05, 2017 8:57 pm    Post subject: Re: Blew AC Hose While Stopped Reply with quote

Perhaps a failed pressure switch?
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Abscate Premium Member
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PostPosted: Thu Jul 06, 2017 2:45 am    Post subject: Re: Blew AC Hose While Stopped Reply with quote

One of the few failures that is fixed by rolling a joint and opening a window....your shoulder, opening the window...what did you think I meant?
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djkeev Premium Member
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PostPosted: Thu Jul 06, 2017 3:20 am    Post subject: Re: Blew AC Hose While Stopped Reply with quote

I've removed 30 year okd A/C hises and looked at them. While they are indeed showing cracks I would never expect one to blow!

Yet another argument for modernizing your entire A/C with new hoses and such.

Dave
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greebly
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PostPosted: Thu Jul 06, 2017 6:16 am    Post subject: Re: Blew AC Hose While Stopped Reply with quote

djkeev wrote:


Yet another argument for modernizing your entire A/C with new hoses and such.

Dave

wolfram wrote:
spewing R134 and fluorescent dye

Especially if you are going to convert to the higher system pressure R134 requires.
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Wolfram
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PostPosted: Thu Jul 06, 2017 9:08 am    Post subject: Re: Blew AC Hose While Stopped Reply with quote

Note the AC wasn't even operating when it blew.
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Westified
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PostPosted: Thu Jul 06, 2017 11:36 am    Post subject: Re: Blew AC Hose While Stopped Reply with quote

You were lucky it didn't blow the hose on the interior of your vanagon. What a mess that would be. I had a similar incident. I converted to 134a and had my van idling in the driveway to see how good the AC was with the new 134a. I was about 15 feet from the van and all of a sudden there was a huge boom. Sounded like a gun shot. Scared the crap out of me. The hose above my new propane tank blew. Then a cloud of the gas enveloped the the van. I thought it was on fire. I ran over and shut it off. Made a mess all over the tank. I have now replaced my entire AC system except for the Evaporator inside. I mean everything with new barrier hoses, fittings, 709 Sanden compressor, dryer, parallel flow condenser and blower fan. The old hoses and higher pressure of the 134a did it.
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greebly
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PostPosted: Thu Jul 06, 2017 11:54 am    Post subject: Re: Blew AC Hose While Stopped Reply with quote

Wolfram wrote:
Note the AC wasn't even operating when it blew.

Generally AC pressure will stabilize across the system unless there is a major restriction and static pressure will vary with external temperature. A properly charged R134 system will show 70 psi on both high and low side at 70F at stasis. If the hose blew under static pressure it is a wonder it did not explode under system pressure.
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