Question about 1997 Dodge Caravan

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Water leak From Heater Inside Passenger Compartment

I have water leaking from the heater inside the passenger compartment. When I turn the vehicle on, water gushes out from underneath the dashboard. From researching, I assume the problem to be either the heater core or a vavle? Or could it possible be a relay problem preventing a valve from opening or closing? This vehicle also has an elcetrical problem with the interior lights coming on / off and door locks clicking with door ajar message on dash. I am trying to solve this problem also but living with it for the time being but the water problem is primary. Any help would be appreciated.

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  • Dodge Master
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Your coolant level should be going down too, so to confirm leak at core, check that. Just in case it's water leaking in elsewhere. Can you smell the antifreeze inside? Does it do it even on dry days, no rain?
Double check hose connections are good & tight where they connect to heater core at firewall. Have seen a couple of bad connections allow coolant to leak inward to vehicle. System pressure test will confirm also.

Posted on Dec 28, 2008

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Posted on Jan 02, 2017

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1 Answer

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Most likely problem is a leaking heater core. This is what usually causes water leaking into the passenger compartment. Quick fix on many vehicles is to get a hose adapter the same internal diameter as the heater hoses, remove the heater hoses from the firewall connection to the heater core, and install the adapter, making a bypass loop. This will allow operation of the vehicle without coolant loss until you can replace the heater core. Of course you will have no heat in the passenger compartment during this time.

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Bulletin No.: 03-01-39-011B
Date: November 22, 2005
TECHNICAL
Subject:
Water Leaks Into Passenger Compartment Through HVAC Module Condensate Drain Tube When Parked on Incline/Uphill Position (Install Auxiliary Drain Tube Extension)
Models:
2003-2006 Saturn ION Sedans and Coupes
Supercede:
This bulletin is being revised to include the 2005 and 2006 model years. Please discard Corporate Bulletin Number 03-01-39-011A (Section 01 - HVAC).
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When vehicle is parked on an incline with the front end up during a rainstorm or when driving uphill during a rainstorm, water may leak into the passenger compartment through the condensate drain tube opening of the HVAC module.
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Correction 1. Open the hood and locate the HVAC module condensate drain tube in the engine compartment on the right side of the dash panel.
Important: During installation of the auxiliary drain tube, do not make contact with the HVAC module foam gasket located at the base of the HVAC module condensate drain tube. If the auxiliary drain tube is pushed on too far and makes contact with the foam gasket, water may leak into the passenger compartment.
2. Slide the auxiliary drain tube onto the HVAC module condensate drain tube and make sure that the auxiliary drain tube is angled downwards after installation.cansmo_121.gifcansmo_122.gif

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Water or coolant? inside the driver compartment or under the hood? if it is inside it sounds like a leaking heater core

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There is a water leak on the passenger side just in front of the firewall. It is a steady stream when I fill the radiator even when the engine is off. No water in the passenger compartment.


The heater core may be leaking or a coolant line near the firewall. The fact that the inside isn't wet doesn't mean it is not a heater core problem, as the plastic catch pan may redirect fluid to the firewall 'weep' hole.

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That depends on whether or not you also notice some leakage into the passenger compartment footwells. If the heater core has failed, the coolant tends to fill the front footwells, particularly on the passenger side.

One thing that I have seen multiple times, though, is the water pump tends to leak, particularly if it is the original pump. They have a high pattern failure rate.

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remove both hose's that go to heater core and connect hoses with a piece of tubing, or make a loop with on hose to connect both water outlets .

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