Question about 2000 Mercury Grand Marquis

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Water collection in the air conditioner. Drain is

Water collection in the air conditioner. Drain is plugged. (Evaporation Pan)

The Evaporator Pan in the Air Conditioner collects water and does not drain out, or evaporate. When you are driving you hear water scholshing around on the front right of the car.

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  • Anonymous Mar 17, 2010

    Thanks, but we tried the obvious; the coat hanger, Also, the service stations tried blowing any debris out of the drain line w/ their compressor hose; no luck. Can we drill a small hole in the "overflow pan" (?) under and behind the glove box?

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You need to clean the drain out as your first step. This is accessed by raising the vehicle on a lift then using something like a coat hanger pressed into the drain hole at the base of the firewall next to the transmission bellhousing on the passenger half of the vehicle.

Posted on Mar 17, 2010

  •  Chris Weber
    Chris Weber Mar 17, 2010

    Yes you can drill a hole in the Evaporator case but this will not accomplish much since you will now have a floorboard full of water and a hole for it to always escape from. You may want to double check with a helpers ear that this is the origin and its not water trapped in the door or under the door scuff plate on the body.

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1 Answer

My cabin air filter was wet and frozen, I had no air flow to defrost or heater what would cause the water?


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2002 Tribute water collecting on floor of cabin passenger side


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1 Answer

Where is the evaporator hose


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1 Answer

Air conditioner draining in floor board


It sounds like the evaporator pan drain is plugged or worst case the evaporator is rutptured.Try clearing the drain,open hood and look on lower rightside of firewall for a very short rubber hose.Use small screwdriver and clean out hole.Hope it's just plugged.

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1 Answer

Is it normal for a car to drip water on the ground after running the air conditioner?


Yes, The air conditioner evaporator core inside the vehicle is very cold when the a/c is operating and moisture will condense on the outside of it, especially on a humid day. This moisture then trickles down the sides of the core and collects in the plastic housing beneath the core where it then escapes through the evaporator housing drain tube and drips on the ground beneath the passenger side of the chassis. The more humidity in the air the more moisture you will see dripping onto the ground. If the little drip hose should ever get plugged up this water then will overflow the housing and drip on the passenger side carpet so if you ever have that problem you'll know what the cause is.

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2 Answers

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Like a house window air conditioner, the water collects on a pan and drips out a tube.

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1 Answer

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There is condensation that occurs when the warm, humid air passes over the evaporator in the system. This is the part that produces the cold air inside by removing the heat through a process of evaporation. The water collected is allowed to run out of the assembly through a drain that protrudes through the firewall of the vehicle. I believe this is plugged. Look for hole on the firewall insulating material that has a small, black tube coming out of it. It won't be real long, just enough to stick out past the firewall. Use a short piece of coat hanger, drill bit, etc... to clean it out. DO NOT push anything in there more that 2-3 inches to avoid damage to the heater core or evaporator. If it's too plugged, the dash will have to come apart. I hope this works for you.

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1 Answer

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Richard you have to check if your car uses to filter the air-conditioning closed the lid of the engine and where the breeze is a clean-clean grill before you turn off your air off the compressor and that was only working to remove the blower evaporator at all moisture-check that you have good drainage evaporator vote you all that water. Thanks and good luck

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