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Old 10-26-2017   #1
KOOLC4
 
Join Date: Oct 2017
Location: Seattle
Posts: 6
Unhappy 1991 A/C Evaporator Tube

Started my car up today and was backing out of my garage then a loud pop and hissing from the passenger side under the hood. Shut it down and checked things out. The coolant temp switch on the evaporator tube for the A/C condenser had broken off at where the threaded fitting/valve comes up. Couple of questions for you guys. Is there anywhere I can find a replacement tube? It is discontinued, of course, and only one listed that I can find is on EBay, White Racing Products, and the picture is not what mine looks like, no fittings for switches. They don't answer their phone so I am suspect already of doing any business with them. Any help please would be appreciated. Thanks, Keith
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Old 10-26-2017   #2
32valvesftw
 
Join Date: Jun 2015
Location: Texas
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Default Re: 1991 A/C Evaporator Tube

I have no idea about finding a new tube, but maybe you can get the switch out with a sharp chisel and thread a new one in.
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Old 10-26-2017   #3
KOOLC4
 
Join Date: Oct 2017
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Default Re: 1991 A/C Evaporator Tube

The threaded part broke off inside the switch and it backed right out. It contains a valve that looks like a tire valve on a wheel. In other words it broke at the pipe level so the valve needs to be somehow attached back on the pipe such as soldered/welded or maybe some type of JB Weld?
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Old 10-27-2017   #4
WVZR-1
 
Join Date: Oct 2004
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Default Re: 1991 A/C Evaporator Tube

I'd call locally to older established AC repair facilities and ask about "aluminum brazing" - being an R12 system I believe TIG isn't an option. There's very likely differing opinions but ....

I wouldn't remove the line until I found a shop that says they can repair and I'd be inclined to let them do the removal for the repair. It's entirely likely that they might want to splice a section.
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Old 10-27-2017   #5
-=Jeff=-
 
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Default Re: 1991 A/C Evaporator Tube

Can you post a picture of the line you need?
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1990 Corvette ZR-1 #1051
Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback
Late Model IH - Plenum
Coilovers - 4.10s
Custom Interior
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Old 10-27-2017   #6
KOOLC4
 
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Default Re: 1991 A/C Evaporator Tube

Thanks for the replies. It's the bottom pipe/ hose, #15 in the diagram.
Attached Images
File Type: png AC ZR-1.png (45.2 KB, 44 views)
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Old 10-27-2017   #7
-=Jeff=-
 
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Default Re: 1991 A/C Evaporator Tube

That is the high pressure hard line.. I would think the L98 for 90-91 should be the same..

So is the fitting completely gone? or the inside threads are gone where the schraeder valve was?
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1990 Corvette ZR-1 #1051
Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback
Late Model IH - Plenum
Coilovers - 4.10s
Custom Interior
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Old 10-27-2017   #8
WVZR-1
 
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Default Re: 1991 A/C Evaporator Tube

Quote:
Originally Posted by -=Jeff=- View Post
That is the high pressure hard line.. I would think the L98 for 90-91 should be the same..

So is the fitting completely gone? or the inside threads are gone where the schraeder valve was?

Actually NOT - it's '90 & '91 LT5 only
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Old 10-27-2017   #9
-=Jeff=-
 
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Default Re: 1991 A/C Evaporator Tube

huh.. wonder why?

I cannot get to mine to look at it.. a picture of the actual broken line would help
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1990 Corvette ZR-1 #1051
Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback
Late Model IH - Plenum
Coilovers - 4.10s
Custom Interior
NCM Lifetime Member #978
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Old 10-27-2017   #10
KOOLC4
 
Join Date: Oct 2017
Location: Seattle
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Default Re: 1991 A/C Evaporator Tube

The threaded portion of the pipe with the valve in it broke at the base and was inside the switch/sensor. Here is a picture.
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File Type: jpg HVAC Fail.jpg (67.0 KB, 39 views)
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