Help needed - SW20 Turbo - A/C TX Expansion Valve part number

Re: Help needed - SW20 Turbo - A/C TX Expansion Valve part number (TomsMR2)

Thu, 03 Mar 2016 11:46:18 GMT

Please pm me his details, I am also looking to see if it is an option to cut the evaporator inlet and flip it 180 degrees and get it welded back
Might work out a lot cheaper than buying another one

Re: Help needed - SW20 Turbo - A/C TX Expansion Valve part number (mr2y)

Mon, 29 Feb 2016 19:35:01 GMT

I can PM you the name of the guy who ordered me a genuine evaporator for $220, but he said it was the last in the country. I have my American one sitting here, I'm considering putting it in the recycle bin...

Re: Help needed - SW20 Turbo - A/C TX Expansion Valve part number (TomsMR2)

Mon, 29 Feb 2016 19:18:36 GMT

mr2y
I am presently eating my own words. When I tried to bolt everything together with the 47500-1730 it is backwards. I'm guessing Taragos have the TX valve on the other side of the evaporator. Spoke to my local air conditioning guy he said the R12 ones work fine. So I think I'll go with Tony's solution, cause this valve isn't going to work.

Edit: ok it turns out it WAS the right one, but I had purchased the wrong evaporator, which seems to be backwards so I'm assuming because I bought it from the USA it's for US cars, not JDM.

Wish had seen this before I ordered my evaporator from the states
I have exactly the same issue :(
Any chance there will be a Tx valve available that can be installed the other way?

Re: Help needed - SW20 Turbo - A/C TX Expansion Valve part number (mr2y)

Fri, 12 Feb 2016 11:09:03 GMT

I am presently eating my own words. When I tried to bolt everything together with the 47500-1730 it is backwards. I'm guessing Taragos have the TX valve on the other side of the evaporator. Spoke to my local air conditioning guy he said the R12 ones work fine. So I think I'll go with Tony's solution, cause this valve isn't going to work.

Edit: ok it turns out it WAS the right one, but I had purchased the wrong evaporator, which seems to be backwards so I'm assuming because I bought it from the USA it's for US cars, not JDM.

Re: Help needed - SW20 Turbo - A/C TX Expansion Valve part number (mr2y)

Wed, 13 Jan 2016 08:31:59 GMT

Denso 047500-1730 fits my 1990 R12 evaporator
Purchased from Autofrost.com.au
Update 12/02/2016: it's not the right one, it's backwards. See my posts below
Update 13/02/2016: ok it is the right one, I had accidentally purchased the wrong evaporator which is why it was backwards (I think the US ones are backwards maybe?)

Re: Help needed - SW20 Turbo - A/C TX Expansion Valve part number (Guest)

Wed, 23 Dec 2015 23:47:50 GMT

Definitely agree with Peters comments regarding the drier done by a/c mechanic - at time of regassing and important to cleaning thoroughly.
Anyone attempting anything said here, please note, it is critical the a/c system is degassed by an a/c mechanic prior to doing anything on this post.

Re: Help needed - SW20 Turbo - A/C TX Expansion Valve part number (Peter)

Wed, 23 Dec 2015 20:53:11 GMT

Hi Tony,
That is interesting about molecule size & leakage. I hadn't heard that before. I would expect that an R12 TX Valve should work o.k. on R134a, because the pressure/temperature relationship is quite similar.
Just a point on your advice about changing out the components & then having a licensed Technician do evacuation & charging. That is good advice. It is only mechanical work.
My point is to suggest that you don't fit the new filter drier. Leave the old one in, & for the technician to fit the new one. The "drier" part is a dessicant, which will absorb moisture from the air, which will be in the tubing.
Another point is to be scrupulously clean. Dirt & moisture are killers for refrigeration systems.

Re: Help needed - SW20 Turbo - A/C TX Expansion Valve part number (Guest)

Wed, 23 Dec 2015 17:28:21 GMT

Solution- early 1993 mr2 turbo sw20 air condoning replacement Tx expansion valve for leaking air conditioning. This is for Tx a/c expansion valves with a recessed lip and 6mm bolts as per previous pictures. There are different Tx valves for mr2 sw20s.

The 1993 car was designed for the old gas. Toyota recalled the mr2 of 1993 because of faulty Tx expansion valves in high heat / high humidity, so the part was listed as discontinued.

The new a/c gas molucules are smaller, so Tx expansion valve internal seals were redesigned, however unknown part number for the mr2 to this point. Apparently you can still use the old Tx valve designs, there is a possibility the gas at an incredibly small amount can leak past the internal seal. Apparently it's a molucules amount and the gas stays within the system, just that it can go past the internal Tx valve (stressed that it's a molucule amount) and doesn't effect the heating/normal air running past the evaporator.

Supercheap auto assisted me with their supplier of jayair products. The supplier has the original part design (old gas design) denso 047500-9071 aka TX9070. Supercheap auto can order it from the supplier. Cost was $55.

That was my experience in trying to get a fitting part. Should anyone come across the part number of the new gas style valve Tx expansion a/c valve that has a recessed lip, please post up for future readers.

Re: Help needed - SW20 Turbo - A/C TX Expansion Valve part number (mr2y)

Tue, 22 Dec 2015 16:07:50 GMT

Your sacrifice will help many. I'm betting on Denso 047500-1730 for SW20 manufactured before 8/1993 and including the Japanese ones before 12/1991. If I wasn't so broke I'd click buy now, but I'll have to wait a few weeks.

Re: Help needed - SW20 Turbo - A/C TX Expansion Valve part number (Guest)

Tue, 22 Dec 2015 14:21:23 GMT

Yep have read the Internet, all the listings and unfortunately I have purchased multiple parts that list as a mr2 however they are not - see the pics. My misfortune from buying eBay where it costs more to return than your money back - hence why I am posting my experience so others don't waste money.
The picture attached shows the ugly looking one on the front right (dead out of my car), the front left one out of another club members car who's tried to help, then the other parts purchased in the background, with the left one wrong ridge/lip size, and the right one wrong bolt hole size.
The denso 447500-9052 has the incorrect size ridge / edge for forming a seal / sitting against the evaporator plate/joiner.
Yes you need the Tx expansion valve for the type of gas you are running cause the gas behaves differently. Some of the part numbers are discontinued/superseded because of the change in Australia to only the new gas being sold (legally).
I will upload when I have found the correct replacement part.

Re: Help needed - SW20 Turbo - A/C TX Expansion Valve part number (mr2y)

Tue, 22 Dec 2015 12:26:49 GMT

Peter
On mr2y's Evaporator Assembly the green dye appears to be from the joint between the TX Valve & the flange on the Evaporator.

I'm putting two and two together, I believe I have the recalled R12 TX valve, which I assume jammed and would not return to the open position (I bet the spring corroded and broke inside it, I'll be doing an autopsy soon). With a closed high pressure opening, every time the compressor engages it will get an over pressure condition tripping the pressure switch. But in the meantime that pressure has gone beyond the specifications of the o-rings and sprayed out from the TX valve and at the high pressure end of the compressor. Basically thousands of dollars have been spent because of a broken thermal expansion valve failing to return to the open state. Autopsy will be coming soon ...

Edit: I should mention the R134a version of the valve will work at a slightly higher pressure so it's important to get all the seals replaced and working. I don't believe there's a different pressure switch (the one located inside the evaporator box) I think it should work just fine for R134a.

Edit2: I just realised the spring in the TX valve pushes it closed (not open), so it's more likely the gas in the pressure bulb has leaked out, so an autopsy wont reveal anything.

Re: Help needed - SW20 Turbo - A/C TX Expansion Valve part number (mr2y)

Tue, 22 Dec 2015 12:10:24 GMT

Ok found this information from searching the internet and various catalogues:

SW20 12/1991 - 8/1993 - R12 evaporator 210x245x90 - Denso 047500-1730
SW20 9/1993 - 11/1999 - R134a evaporator 207X242X92 - Denso 447500-9052

It seems you and I both might have the R12 core (I know I definitely do because I measured it)
So far it looks like autofrost.com.au has been the most helpful:-

R12 core TX valve - http://www.autofrost.com.au/store/index.php?route=product/product&product_id=753
R134a core TX valve - http://www.autofrost.com.au/store/index.php?route=product/product&product_id=819

Please don't take this as gospel just yet, I'm just reporting my findings...

Edit: here are the dimensions of my R12 evaporator core (approximate): 210x245x90
The R134a core is roughly: 207X242X92
(added to the part list above)

Re: Help needed - SW20 Turbo - A/C TX Expansion Valve part number (mr2y)

Tue, 22 Dec 2015 11:53:46 GMT

TonyMR2
I can confirm that the following part numbers do NOT fit a 1993 mr2 turbo....
88515-60210 (Toyota part)
447500-2370 (denso - equivalent to above) - the 6mm bolt holes on one side taper to 5mm so you can't put the holding bolts through.
447500-9052 (denso) - the recess lip for fitting against the plates/orings on the evaporator is not deep enough to form a seal.

Thanks for your findings Tony. Just to be clear, did your 1993 SW20 come factory with R134a gas? My 1990 GT had R12 and the evaporator is slightly different to the R134a version. I was under the impression that the ~~447500-9052 is the replacement for the R12 TX valve which converts the R12 system to R134a~~ (see my post further down)

Re: Help needed - SW20 Turbo - A/C TX Expansion Valve part number (Guest)

Tue, 22 Dec 2015 11:33:22 GMT

Ashdown-Ingram seem to have all the components and parts of an a/c system. Never heard of them before but will remember now.
I am awaiting a part from super cheap as they didn't want to refund the wrong part that was ordered, wanting to replace with another part. See what happens when I get this next part.
I also found a a/c specialist who has the superseded part but wouldn't give me the part number.
With the link to ashdown-Ingram I am confident this will soon be solved.

Re: Help needed - SW20 Turbo - A/C TX Expansion Valve part number (Peter)

Tue, 22 Dec 2015 10:58:27 GMT

Hi Tony,
If Ashdown-Ingram is nearby, I would suggest that you go there with a TX Valve that you know is the correct shape/size.
While the counter person may not know much technically, they should have stock of valves with which you can compare.