No, there is only one filter in the NAG1/W5A580 trans. The block in the cooler lines is a thermostat.
[EDIT] Whoops, I re-read your post, I originally thought you were going to do this yourself, I see you are taking it in for service and was just double checking what the dealership told you. (I leave the rest of my post up for those considering doing it themselves).
Make sure the Dealership is just going to drop the pan, change the filter and re-fill, there is a TSB out telling the dealers NOT to flush transmissions, but many dealers are doing it anyway, and it has caused problems.
IMO, the dealer shouldn't be charging more than $150 for this service, if they are charging more than $200, walk away, they are ripping you off big time and should NOT be trusted. Look for an independent shop or Mercedes dealer (since its a Mercedes trans), make sure they have the special tool to measure the fluid level.
[Consider doing it yourself, I did, a lot cheaper than the dealer, even after buying the tools you'll need.]
In my case, only one local store carried the filter, and it was $50 for the filter, even though it looks no better constructed than the $10 filter for any other trans. I suspect the fact its a Mercedes Trans is behind the high filter price. It does come with a new seal for the pan, and that pan seal does look superior to your average trans pan seal, BUT, still NOT enough to command an extra $40 in price.
You can find the filter a lot cheaper at rockauto.com or other online places, but you'll have to wait a couple of days for it to arrive.
You will need the special tool to check the trans fluid level, I got mine off e-bay for $25, and a way to measure the temperature of the trans fluid. This trans is extremely sensitive to being overfilled, you have to be ultra precise with the trans fluid level. Thats why Chrysler seals it up and tells the owner to just bring it to the dealer for service.
I dropped my pan and changed fluid in order to install a trans temp gauge, so I solved the problem of measuring the trans fluid temp at the same time. I would think any accurate temp measuring device pressed up against the trans pan for a few minutes would suffice.
You can find the level to temp chart posted in several places on the internet, just google it.
One more tip, I measured the volume of fluid I drained out of the trans and I added no more than what I drained. Sure enough, after a quick test drive to warm up the trans (and it warms up slow in cold weather, took me about 15 miles of stop and go traffic to get it up to 150°F) the fluid level was dead on center of the range for the chart of level vs. temp.
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Last edited by Mongo; 03-26-2011 at 09:29 AM.