After much shopping for the past month or so my wife and I found a 01 GMC Serria with a DMAX/ALLI and purchased it this past Sat (The 31st), Sunday night on our way home from dinner we dropped of our Nebighors at thier barn and I noticed what looked to be condensation from the AC unit pooling on the ground and thought that it was no problem. However, yesterday morning I moved it before I left for work and noticed that there was the same looking puddle upon start up. As I'm new to Diesel and DMAX's, is this typically or is there something going on? Your able to see it from the passenger side wheel well and I did check and smell it, it is water...


Thanks in advance,


Kelly Campbell





P.S. It so nice to be rid of my wife's dodge....:)

Try this link. I would start with the filters, cheapest and probably need it anyway http://dieselplace.com/forum/forum_posts.asp?TID=11387&PN=1


Sorry, wrong link. Anyway if your cab air filters are clogged it will result in lower air flow volume and the evaporator will ice up thereby causing an excess amount of water to drain out after shutdown. 01's and 02's have filters and the newer ones don't, I believe. An easy way to check if your evaporator is icing is to turn the fan on full and see if there is a decreased amount of air flow after the AC has been on for an extended period. Turn the compresssor off with outside air selected as the air source, if it still blows cool air and the amount of air flow gradually increases as the temp of the air increases then your evaporator is probably icing up. One thing that can cause icing is decreased air flow over the evaporator due to clogged filters. I'll bet they need changing anyway.Edited by: a64pilot

Normal condensation drain from Evaporator.


Congrats on the new truck.

If it's just plain water and no anitfreeze, what else could it be?


Congrats on the new purchase.

When I drove it last it had no problems gettting cold at all however, it is possible that it could be the in-cab air filter, where are they to check?





Kelly


P.S. Thanks for the Help!

They are on the passenger side, inside the cab of the truck. Down where the toes of your passenger would be. There is an L shaped door. The short part of the L faces towards the seat (runs vertically). The long part of the L faces the floor. On the bottom is a self tapping screw (use a nut driver, forget which size, or a flathead screwdriver) Remove the screw, and the door (towards front of truck) will drop down. The back part of the door snaps into place. The filters just pull out. There are two.

Hope you can make sense of my explanation. Good luck with the truck, and welcome to the site. Don't be afraid to ask questions. At the top of the pages is a search feature. Good chance any questions you have, have already been answered.http://www.dieselplace.com/forum/smileys/Big Smile.gif

I believe. An easy way to check if your evaporator is icing is to turn the fan on full and see if there is a decreased amount of air flow after the AC has been on for an extended period. Turn the compresssor off with outside air selected as the air source, if it still blows cool air and the amount of air flow gradually increases as the temp of the air increases then your evaporator is probably icing up. One thing that can cause icing is decreased air flow over the evaporator due to clogged filters.

How long after shutoff are you talking about??? Ive noticed when i switch mine over that it still blows cold for 10 secs or so.i just figured it was the unit expelling the already produced air...Also whats the deal for 03 and 04 pickups...if they only used cab filters on 01-02 what did they do w/the others???

blanked the hole where the cab filters were and didn't put anything in...http://www.dieselplace.com/forum/smileys/Disapprove.gif

Why? I wonder what the reason is/was?

I'll amost guarantee you its the Cabin filters. I had the same problem a while back. Here's the thread on it...


http://dieselplace.com/forum/forum_posts.asp?TID=11177&KW=excessive+h2o


Mine still leaves a little puddle, but not near as much as it did before.


Jason

I believe. An easy way to check if your evaporator is icing is to turn the fan on full and see if there is a decreased amount of air flow after the AC has been on for an extended period. Turn the compresssor off with outside air selected as the air source, if it still blows cool air and the amount of air flow gradually increases as the temp of the air increases then your evaporator is probably icing up. One thing that can cause icing is decreased air flow over the evaporator due to clogged filters.




How long after shutoff are you talking about??? Ive noticed when i switch mine over that it still blows cold for 10 secs or so.i just figured it was the unit expelling the already produced air...Also whats the deal for 03 and 04 pickups...if they only used cab filters on 01-02 what did they do w/the others???


A couple of minutes or so seems to depend on how much ice and how long it takes to melt. I believe the filters were removed because like all filters if they are run until they clog they will adversly affect the system they protect. I theorize that not many people are aware of these filters and GM was getting more complaints caused from clogged filters than they will from having no filters. Just My theory you understand.

I believe the filters were removed because like all filters if they are run until they clog they will adversly affect the system they protect. I theorize that not many people are aware of these filters and GM was getting more complaints caused from clogged filters than they will from having no filters. Just My theory you understand.


Good one! Me thinks your theory is right on.


You also want to throw in the $$ savings by not doing them!

I work for Delphi Thermal /Harrison Radiator who produced these units. I inquired as to why they no longer include them and was told that it was that as they clog up they put more stress on the blower motor. People weren't changing them and blower motors can be pricy to replace.

Makes sense. I really wasn't aware I had them. Replaced them after two years. Never had a problem though.