Floor wet from A/C - Dodge Cummins Diesel Forum
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post #1 of 16 (permalink) Old 07-13-2016, 09:06 PM Thread Starter
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Floor wet from A/C

Yet another "my floor is wet from the A/C thread." I just had the A/C in my truck recharged. It's been non-functional for 6 years. I've been using it and I have water running out the floor duct on the passenger side. I figured the drain was just plugged up form lack of use. I blew air back through it and attached a piece of rubber hose to it to extend it away from the firewall. I've heard that sometimes the water can run back along the bottom of the factory drain line and drip on the floor. Well, still no change. The factory drain has water dripping from it, but there is still water leaking out the floor duct. What do I do now?


96 3500 Ext Cab dually, flatbed 4x4, NV4500, 4.10s, 262K, BHAF, 17*, 100 plate, AFC mods, 024 DVs, 3K GSK, benched by Farrell, Haley 5x.012s, Hamilton 178/208, 165 Beehives, O-ringed, 62/65/14, Coated pistons, ARP studs, South Bend 13" Con-OFE
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post #2 of 16 (permalink) Old 07-14-2016, 11:07 AM
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Still sounds like a plugged condensate drain to me. You may be seeing drops from the tube, however the blockage may be allowing a small bit by. Evap case may have crack as well?
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post #3 of 16 (permalink) Old 07-14-2016, 12:19 PM
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Dodge Ram A/C Drain Line Installation &raquo Motor Mayhem

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post #4 of 16 (permalink) Old 07-14-2016, 12:22 PM
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For the drain, be certain it's got a 90 degree bend pointing to ground to keep water from following drain hose back to firewall.
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post #5 of 16 (permalink) Old 07-14-2016, 12:43 PM Thread Starter
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Already tried the rubber hose extension, no luck. It doesn't feel like the drain is restricted when I blow air back into it...
Any other thoughts?

96 3500 Ext Cab dually, flatbed 4x4, NV4500, 4.10s, 262K, BHAF, 17*, 100 plate, AFC mods, 024 DVs, 3K GSK, benched by Farrell, Haley 5x.012s, Hamilton 178/208, 165 Beehives, O-ringed, 62/65/14, Coated pistons, ARP studs, South Bend 13" Con-OFE
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post #6 of 16 (permalink) Old 07-14-2016, 04:25 PM
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same issue here....
will keep an eye on this thread and please let us know what do you find out.

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post #7 of 16 (permalink) Old 07-14-2016, 05:25 PM
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If your drain is plugged at All, and your system is freezing, It may overwhelm it's ability to drain fast enough. Be sure system is cycling properly and is full. If the compressor doesn't cycle it could cause iced up evaporator. Does your air flow ever seem to decrease?
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post #8 of 16 (permalink) Old 07-18-2016, 11:19 PM Thread Starter
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Air flow seems constant. I just took the truck on a 4+ hour road trip and had the A/C on the entire time. I blew cold the whole while. At idle, I can hear the compressor cycling. Still have a trickle of water coming out of the floor duct...

96 3500 Ext Cab dually, flatbed 4x4, NV4500, 4.10s, 262K, BHAF, 17*, 100 plate, AFC mods, 024 DVs, 3K GSK, benched by Farrell, Haley 5x.012s, Hamilton 178/208, 165 Beehives, O-ringed, 62/65/14, Coated pistons, ARP studs, South Bend 13" Con-OFE
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post #9 of 16 (permalink) Old 07-18-2016, 11:54 PM
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I wonder if you cleaned the evaporator that the water drip would remedy. Drill a small hole in the case and hit liberally with coil cleaner and rinse with spray bottle. Plug hole with silicone. Perhaps half or more of the coil is plugged with crap and the air flow is too high on remaining surface area blowing condensed water past coil.
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post #10 of 16 (permalink) Old 07-19-2016, 10:43 PM Thread Starter
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Hmmm...that sounds plausible. Where's the best place to drill the hole?

96 3500 Ext Cab dually, flatbed 4x4, NV4500, 4.10s, 262K, BHAF, 17*, 100 plate, AFC mods, 024 DVs, 3K GSK, benched by Farrell, Haley 5x.012s, Hamilton 178/208, 165 Beehives, O-ringed, 62/65/14, Coated pistons, ARP studs, South Bend 13" Con-OFE
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post #11 of 16 (permalink) Old 07-19-2016, 11:26 PM
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In the evap case about center. Either way it's fine to clean the coil, won't hurt.
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post #12 of 16 (permalink) Old 07-21-2016, 10:04 PM Thread Starter
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Ok, this might sound stupid, but where exactly is the evap inside the whole heater/AC box?
The more I think about it, the more I think you're correct about the fan blowing condensation off the evap. When the fan is on high I get a whole lot more water out the floor vents than when it's on a lower setting.

96 3500 Ext Cab dually, flatbed 4x4, NV4500, 4.10s, 262K, BHAF, 17*, 100 plate, AFC mods, 024 DVs, 3K GSK, benched by Farrell, Haley 5x.012s, Hamilton 178/208, 165 Beehives, O-ringed, 62/65/14, Coated pistons, ARP studs, South Bend 13" Con-OFE
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