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On my 1986 Toyota Pickup, I purchased a new evaporator unit (GPD) and a new expansion valve (Denso) but I couldn't find a new low pressure switch and the aluminum tube its installed on. So I tried to reuse the old one but the fitting on the new expansion valve is different, then I tried to use the old expansion valve but the fitting on the new evaporator unit is also different. The new evaporator and new expansion valve match though, so there must be a new line with w low pressure switch that also matches but I can't find it. Has anyone else run into this?
Here's a picture of the switch and the line it's attached to.
This is where the issue is, the new expansion value on the left has a smaller opening with an internal collar while the old one on the right has a larger opening and no collar. I can't use the old valve because the threads on the other side are different from the new evaporator. It's like all the new r134a ac parts have different sized connections than the original r12 parts.
I have a Denso 475-0101 expansion valve still in the box. I’ll get it tomorrow and see what the threads look like.
my only other thought is tracking down a metric adapter for a flare fitting.
that's what my new stuff looked like as well .. there like a brake line dbbl flare , no O-rings .. shouldn't be hard to have them custom made .
one of my alum. lines , the fitting twisted off , I bought an extra flaring tool , so now I have 2 . i'm going to try make my own "original" type o-ring flare using these tools in my press .. as NO ONE can make these flares here where I live .
I have a Denso 475-0101 expansion valve still in the box. I’ll get it tomorrow and see what the threads look like.
my only other thought is tracking down a metric adapter for a flare fitting.
Hmm, if the Denso 475-0101 expansion valve fits the original pressure switch line, it may be easier then to use that valve and a reducer to connect it to the evaporator unit rather than try to find a metric adapter for a flare fitting to connect to the new valve.
I looked at my 475-0101 expansion valve. it looks pretty similar to the one you bought, 475-2086. One threaded end is M14, the other is M19.
My only suggestion is try and find a adapter, but being metric will make it tough. The other is make your own pipe.
I looked at my 475-0101 expansion valve. it looks pretty similar to the one you bought, 475-2086. One threaded end is M14, the other is M19.
My only suggestion is try and find a adapter, but being metric will make it tough. The other is make your own pipe.
So yours has the inner collar too instead of the original smooth bore?
Btw, I went to Toyota and found the part number of that line, it's 88716-89146. No surprise it's discontinued and I've searched everywhere for an aftermarket manufacturer and not a single result. I'll probably have to go Slacker's route and flare the end to fit.
Yes, same inner design as the one you received. Even if available I doubt getting a new Toyota pipe would have worked, it most likely would have matched the one you already have.
I managed a fix to combine the parts. I found a Four Seasons expansion valve which had the correct threads to match both the new evaporator unit and the old line with the pressure switch however it also had the internal collar like the Denso has, so I carefully drilled out the collar, keeping the shaving from falling inwards, and it fit just fine. However the old low pressure line from the evaporator to the compressor also didn't fit. The new evaporator is a 7/8's inch fine thread and the old low pressure hose was an M24 extra fine thread and no one makes that kind of adapter. So I took the low pressure hose to a local auto repair shop that specializes in AC repair and had them fabricate a new hose with a new 7/8's thread on one end and the original compressor fitting on the other. Added 2 oz of ester oil for the new evaporator and vacuum tested it. It held -24psi for an hour so it works, even if it is a frankenstein amalgamation of parts, I'm just glad to have AC again.
Grego92 -
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You were able to get a replacement oem pipe for the pressure switch to the expansion valve? The Toyota dealership I went to back in January said there were none available anywhere in California. I had to reuse the old pipe and had a custom line made for the other side.
Grego92 -
If a user has "infinite scroll" enabled, no more page numbers. You can just link to the post number in the upper right. (in this thread, mine is #16).
I am having the same problem. My truck was a plain jane with no P/S or anything and I seen on Rock Auto they had a low pressure line for a Dealer installed AC and I searched on the internet and I did find a complete AC kit that is no longer made. I think my truck has a dealer installed AC and not a factory AC and the parts are just a little different and when we purchase a new expansion valve for a factory AC it does not fit the dealer installed evaporator or the aluminum tube that the low pressure switch is fitted too. If I can find a used (not available new) aluminum tube for a factory AC I will purchase a new Denso evaporator and get a new low pressure hose for factory AC and see if I can make that work, if not just keep buying parts for factory AC until I do or I replace them all LOL. I can not find a new low pressure switch anywhere so if that does not work I will jumper wire / bypass it
02-17-2020, 06:47 PM
