Question about 1995 Isuzu Trooper

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Heater core leak ??

1995 trooper - passanger carpet is damp and i believe its the heater core leaking. i havent pulled the carpet back but the upper area of the carpet around the transmission area and directly beneath the dash doesent appear to be wet, but the faint smell of antifreeze leads me to believe that it is the core leaking. how much of a pain is it to change this part and what should it cost. what appeares to be the heater hoses in the engine bay seem to go toward the back center of the firewall and cannot see the core stubs coming out of the firewall. it just looks like the core is more under the cnter of the dash rather than to the side like most cars....

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  • rcmartin9 Feb 05, 2009

    I have the same problem with a 1994 Trooper. Possibly because of the plastic fittings on the heater core.

    When you say "remove the upper dash pad" - is access to these bolts through the passenger cabin or from the engine compartment?


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Yes it is a heater core leak, here is how to change it.

Remove battery cables. you have to remove the upper dash pad on this paticular year model. with a 10 mm socket and a 1/2 inch extension remove the 5 retaining bolts. remove the blower assembly under the passenger side of dash. remove passenger side seat and center counsole. drain radiator. disconnect hoses from now exposed heater core. turn it 180 degrees and slide out. Replace in reverse order.

Posted on Dec 11, 2008

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If my heater core was leaking,why wouldnt i have water on my cabin floorboard? how do i tell if heater core is leaking?


Scott, do you see external leaks on the ground? Where? if so, that's not a leaky core, but something else,
When you turn on your defrosters the anti freeze may vaporize and cause a film to form on the inside of the windshield. Take a cloth and wipe the inside of the windshield to see if it smudges. If it does, it IS leaky core inside the box. If not, it still could be a leaky core, but it is not enough to get blown around yet. The heater core box is acting like a bucket. Pull the carpet back by the passenger's feet at the firewall. look to see if it is soaked under the carpet. Pull back the Driver's carpet. Antifreeze travels. Do you see external leaks on the ground? Where? if so, that's not a leaky core, but something else, Lastly, does it smell like antifreeze inside the car? Check all this out and let us know your outcome, Scott. (A heater core in a modern care is not for the faint of heart or limited skill levels.)

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1 Answer

Heater core


if it looks like coolant, and your carpet on the passenger side is damp then yes your heater core is leaking, the best solution for repair is go to parts store near you, pick up a manual for your car, most parts stores carry them, as well as the parts you need for the repair

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Water is dripping from outer heater unit and soaking passanger side of front carpet.


There are two causes of fluid dripping from the heater core/ac evaporator housing. First, if it is running inside the vehicle and getting the carpet wet as described then it is most likely a bad heater core leaking antifreeze into the cab. Secondly, if it is dripping outside only when the a/c or defroster is running then it is the normal expulsion of condensation and is harmless.

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1 Answer

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You have a bad heater hose and it's being pulled in the cab, if your ucky. Otherwise you will have to pull out the heater core and replace it. A new one runs about $75.00 and can be bought at any auto parts store if you wan to try this on your own post here and I will give you the proceedure.

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1 Answer

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1 Answer

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