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Bad threads on Evaporator


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polaraman
New User

Jun 20, 2016, 11:21 AM

Post #1 of 9 (364 views)
Bad threads on Evaporator Sign In

I have an 1989 Mustang GT and I've been having some AC issues. I could charge it up and the next day it would be empty. My mechanic advised me to change out my receiver/dryer first as I have already replaced my compressor last year and it does engage.

However, in removing my drier, a previous mechanic/owner crossthreaded the drier nut onto the evaporator. While removing my drier, it stripped off every thread on the evaporator.

Someone told me that I could cut the nut off of the bad line on the evaporator and use a compression fitting... but how would I cut off that bad part of the flare with the busted threats?


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jun 20, 2016, 11:30 AM

Post #2 of 9 (361 views)
Re: Bad threads on Evaporator Sign In

I think you are talking about an accumulator drier but isn't the point - some are like welded with less time than this. Not necessarily cross threaded (I'm not looking at it) but could drag off threads just doing some normally. Fixes? Evaps if the threaded part I though was a spring lock on these but whatever you say. I part of the evaporator you may be out of realistic options except to replace both items with damage.


IDK - Compression fittings on A/C tubing (metal) isn't really that cooperative just by looks to me for that. Copper tube or some other it can work. Not legal BTW for brake or fuel line repairs just FYI to use compression fittings,


T



Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 20, 2016, 11:51 AM

Post #3 of 9 (355 views)
Re: Bad threads on Evaporator Sign In

No, you're pretty much screwed now. There are no compression fittings that can be used on an evaporator.

You should have found your leak before you even started anything. Now you can't even test it until you replace the evaporator and accumulator. That was never your problem in the first place.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



polaraman
New User

Jun 20, 2016, 12:28 PM

Post #4 of 9 (352 views)
Re: Bad threads on Evaporator Sign In

It was definitely cross threaded because it was extremely hard to take off. The threads on the line coming out of the evaporator (the thing inside the car on the firewall) are completely screwed. I was going to put on a new drier and while the threads start... it never tightens because it gets to a bad spot in the threads and won't allow it to fully tighten against the O ring.


polaraman
New User

Jun 20, 2016, 12:31 PM

Post #5 of 9 (350 views)
Re: Bad threads on Evaporator Sign In

I'm asking the question based on what someone else told me. Several people have told me that I could use a compression fitting if i could get the nut off of the evaporator. I'm just trying to check their validity.

I'm scheduled to take it to a shop next week but i'm checking my options until then.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 20, 2016, 12:43 PM

Post #6 of 9 (347 views)
Re: Bad threads on Evaporator Sign In

It wasn't cross threaded. It was corrosion on the threads. I see it all the time and I replace the evaporator every time. I do a lot of AC work as I am in south florida and I have never seen a compression fitting that can be used on an odd size aluminum pipe. You need an evaporator.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



polaraman
New User

Jun 20, 2016, 12:52 PM

Post #7 of 9 (345 views)
Re: Bad threads on Evaporator Sign In

Thanks...I appreciate your opinion.

How much should labor be to pull the dash on my 1989 Mustang GT and install the evaporator? I suppose I should replace the heater cor he's there right?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 20, 2016, 1:26 PM

Post #8 of 9 (341 views)
Re: Bad threads on Evaporator Sign In

It's 5.4 flat rate hours so multiply that by the shop's labor rate.

The evaporator is probably around $150 list.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jun 20, 2016, 1:48 PM

Post #9 of 9 (335 views)
Re: Bad threads on Evaporator Sign In

Bummer and IDK how to stop that problem. It's some strange "galvanic/electro" action on these things. They just behave like they are crossed or welded. Not so sure location like road salts even matter they just do that.
I don't think you have reasonable options now for the fix. Replace what threaded things are no good,


T







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