SalzundPfeffer

I recently purchased a NAPA filter/drier for my A/C resurrection. PN TEM 208486.

https://www.napaonline.com/Catalog/C...+50062+2062033

I was surprised to find a low pressure switch included with the filter/drier. Is this normal, or did someone accidentally return this part to NAPA with a pressure switch included. I should also add that I found it odd that my local NAPA had this part in stock, so I'm wondering if it was a customer return.

Also. I noticed the NAPA part does not have a sight glass. Are these really necessary? The price was right at ~$19

John_AZ

The NAPA link does not show the pressure switch on the receiver/drier.
The picture is the same type I get from Pelican

With R134a systems, a sight glass is not used on the R/D

The low pressure switch is a bonus !

Does it look like this one?
https://www.napaonline.com/Catalog/C...140470729&An=0

GL
John

SalzundPfeffer

No, its exactly like the one pictured in my original link where both threads are male. The pressure switch in your link looks like the one included, however, it does not mount directly to the filter/drier. The switch I got in my box was loose; not attached to the filter/drier.

I suppose I should double check the PN on the switch to make sure it's the right one before I install it

944Ross

I think mine also included the switch (have bought two there), and there seemed to be a good reason for it; but it's been while. Seems like it was specifically a retrofit drier (R-134a)

m73m95

On some of them, there is just a round sticker over the sight glass. They cover it so it doesn't get painted black, like the rest of the drier. Since the unit was painted after the sticker was applied, they really blend in, and might even be completely hidden because of the thick paint (Mine was like this. It took me a while to notice the sticker)...... but it might not have the glass.

And, there is no difference between an r-12 or r-134 receiver/drier....other than the sight glass. They can all be used for whatever refrigerant you want to use.

944Ross

There is a difference between the desiccant material used in the original R-12 driers and the new ones;

http://www.epa.gov/ozone/title6/609/.../retrguid.html

"Desiccants, Accumulators, Receiver/Driers
R-12 systems use an XH-5 desiccant, while R-134a systems use either XH-7 or XH-9 desiccant. Some manufacturers recommend routine replacement of the accumulator or receiver-drier to one containing XH-7 or XH-9 during the retrofit procedure. (Any systems with silica gel should also be switched to XH-7 or -9 desiccant.) Others recommend leaving it alone. Manufacturers generally agree, however, that the accumulator or receiver-drier should be replaced if the vehicle has over 70,000 miles or is older than five years, and is opened up for major repair. In that case, the only recommendation is to use the R-134a-compatible desiccants."

m73m95

Hmm... Well, I learned something already today, and I just woke up.

I've replaced quite a few of them, and used both r-12 and r-134, and always had success with both. The desiccant material might be different, but it doesn't seem to matter which refrigerant you use. (The EPA will ALWAYS recommend 134, for obvious reasons)