1993 940 AC receiver dryer-hose connection issue

[eurobikenut]

I replaced the receiver dryer on my 940 T and there is a connection problem with the large steel nut on the AC hose threading onto the aluminum threads on the forward facing part of the dryer. The 4 seasons dryer has about 4 more threads on it than the one I removed. It won't allow the hose nut to tighten all the way up without pulling the threads. I thought about hacking off the excess threads but, then that would cut off the o-ring groove and it may not seal. I just looked at the one FCP sells and it also has 8 threads. Have any of you guys ran into this issue? Thanks.

EUROBIKENUT

 

[nickyy]

Don't try to hack the threads. I would return the dryer as defective and order one from a different vendor . Seems strange to me.

 

[apachechef]

Check for notches on the fittings, you might have a metric standard issue error. I don't know if 7 and nines switched between 92 and 93 like 240s did. I do know a mismatched connection there will go partially together, and forcing it will bugger up threads.
.

 

[DET17]

Check for notches on the fittings, you might have a metric standard issue error. I don't know if 7 and nines switched between 92 and 93 like 240s did. I do know a mismatched connection there will go partially together, and forcing it will bugger up threads.
.

For certain, things were changed on the 9 series from 92 and then 93/94ish..... the early systems R12 like I had on my sedan. The Factory R134a systems came along perhaps mid year 93? For sure, 94-95 in my experience looked identical. The resident expert on this question is 2ManyTurbos.... shoot him a PM and he should set you straight. The late systems (94-95) have a unique looking low side charging port, complete with yellow tag labeled R134a. Last time I looked, all the variants were still listed at the Volvo Web Store system. Given the 34 years of age on those machines, I'm betting there won't be any NOS parts left in the supply chain. I've never wrenched on any 93's, but I'm sure that Roy has.

 

[2manyturbos]

For certain, things were changed on the 9 series from 92 and then 93/94ish..... the early systems R12 like I had on my sedan. The Factory R134a systems came along perhaps mid year 93? For sure, 94-95 in my experience looked identical. The resident expert on this question is 2ManyTurbos.... shoot him a PM and he should set you straight. The late systems (94-95) have a unique looking low side charging port, complete with yellow tag labeled R134a. Last time I looked, all the variants were still listed at the Volvo Web Store system. Given the 34 years of age on those machines, I'm betting there won't be any NOS parts left in the supply chain. I've never wrenched on any 93's, but I'm sure that Roy has.

Yes, the threads changed. They are close enough in diameter and thread pitch you can get about 2 turns of the nut before it stops. Go any further and you have ruined both the hose and the dryer. You were sold the incorrect dryer for your particular car. The change happened somewhere between the 92 and 93 models. It is not a hard cut off. 15A had a 1993 that had some of the earlier components on it from the factory.

 

[bobxyz]

I don't know about the 740s/940s, but the '93-only R134a setup on the 240s uses one metric fitting on the accumulator/dryer. There are little notches on the metric hose fitting:

 

[2manyturbos]

I don't know about the 740s/940s, but the '93-only R134a setup on the 240s uses one metric fitting on the accumulator/dryer. There are little notches on the metric hose fitting:
View attachment 37730

I checked a 1993-95 940 AC line I have here and Volvo did not give the line the same treatment. No notches on the nut. What is the obvious difference is the diameter change on the aluminum line. It is much larger on the R-134 system. The 93-95 line is right next to the line on my R-12 1992 940. Those systems are almost identical with the exception of the suction line, compressor and compressor high pressure line. The bends on those lines are different to mate up to the V port configuration of the R-134 rotary compressor.

 

[eurobikenut]

Thanks for the replies everyone! This car is the gift that keeps on (not) giving! I could write a book on the problems/repairs I have had with this thing! ANYWAY, at least now, thanks to you guys, I know that I am no losing my s--t, and there were some different receiver/ dryers for this car. I looked on ebay and every one has the longer 8 thread flange on the forward facing part of the dryer. I now wish that I would have just re-charged the damn thing and went on down the road. I stopped short of forcing the hose onto the dryer, and cleaned up the threads with a 3 sided file and hope that I can return it. I guess it's going to take the vin#to straighten this out. I can't remember where I got the correct dryer/receiver that is on the car now.

Plot twist! I bought a re-routed hose years ago (can't remember why I had to re-route it) from Voulparts that runs the hose from the dryer up along the firewall, and down to the compressor on the drivers side. They are pretty knowledgeable guys and they may have the correct dryer. This kind of crap is the story of my life with this money pit POS lemon! Never have had this kind of bizarre crazy problems with my 240's! Thanks guys!

EUROBIKENUT

 

[eurobikenut]

From Bill at voluparts:

"fine threads were used on earlier than 93 driers [ like 9144328 - and low pressure hoses - seen at the front of the drier .
course threads were used on all 93 and newer year low pressure hose ends and 93 Driers
a new 93 drier 3539935 [ most have 90 degree fittings ] is 27.50 there is also an obscure 93 drier with 65 degree fittings - that i hardly ever see . . ]"

 

[2manyturbos]

Post a picture of your drier and hose just like the picture I posted.

 

[eurobikenut]

Note: this isn't the stock, original hose... sorry, pics aren't showing up. I'm working on it.

 

[2manyturbos]

Note: this isn't the stock, original hose... sorry, pics aren't showing up. I'm working on it.

Does the drier on your 940 have the same inlet/outlet configuration? IOW, parallel. Straight through the canister? If so, all you need to do is order a drier for a 1992 940. It will have the same threads as the hose you have.

 

[eurobikenut]

Does the drier on your 940 have the same inlet/outlet configuration? IOW, parallel. Straight through the canister? If so, all you need to do is order a drier for a 1992 940. It will have the same threads as the hose you have.

2many,
Sorry for the miscommunication on my part. Yes, inlet/outlet configuration straight through. Checked parts geek for a 1992 rec./dryer and their pics don't show enough detail to be sure they have the correct part. At this point, wishing I had just vacuumed it down and recharged with the original rec/ dryer. Thanks.

EUROBIKENUT

 

[2manyturbos]

2many,
Sorry for the miscommunication on my part. Yes, inlet/outlet configuration straight through. Checked parts geek for a 1992 rec./dryer and their pics don't show enough detail to be sure they have the correct part. At this point, wishing I had just vacuumed it down and recharged with the original rec/ dryer. Thanks.

EUROBIKENUT

The picture on Parts Geek shows all the detail you need. It is a straight through configuration just like the drier on your 940 with the ports for the low pressure switch. The difference is going to be the thread pitch on the outlet port. That will match the line you are using. Order it, install it and have your AC working again. Make sure to add a small amount of compressor oil in it first to make up for what is left in the dryer you removed. I would buy oil with the leak detection dye in it if you don't have any oil on hand. Or, buy a small bottle of the dye.

Certified A/C Pro PAG 46 Refrigerant Oil with UV Dye 8oz | AutoZone

Low viscosity PAG oil for R-134a auto A/C systems

www.autozone.com

 

[eurobikenut]

Thanks everyone. I finally got the right receiver/dryer and vacuumed it down. We could see it wasn't holding pressure. I fixed the leak at the passenger side condenser hose connection at the bottom when this adventure started. So, I either still have a leak there, or a new leak. Also, jumpered out the low pressure switch and the compressor clutch didn't engage, applied 12vdc directly to the green wire and the compressor clutch engaged. Thanks.

EUROBIKENUT

 

[2manyturbos]

That’s why I suggested putting in some of the PAG oil with the dye in it. With a UV light it’s easy to detect the leaks

 

[eurobikenut]

I finally got back to working on this project. I did find the leak, of all places at the aluminum block that the hoses connect to has a pin hole leak. Tried to epoxy the leak and long, short, I need a condenser. My 1993 940 is a mid to late 93 model. It has the two post that set in rubber grommets under the condenser. From what I can figure from doing searches, a 94-95 condenser will work? I also looked at the 94-95 condenser in pictures and I think that it is the same as my 1993. Ant suggestions on where to get one? Thanks.

EUROBIKENUT