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Water on passenger side on a 94 Pontiac Grand Prix 3.1 litre. Heater core is still Working fine. What is the problem?

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  • Cars & Trucks Master
  • 5,642 Answers

Could be A/C water,drain tub is plug at bottom on this side under wheel.

Posted on Dec 08, 2014

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6ya6ya
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Posted on Jan 02, 2017

johnsmith992
  • 37 Answers

SOURCE: Replace heater core in Pontiac Grand Am GT 3.4l

ram a sharp chissel or pointed head centre punch through the core and prise it out .,than tap the new one in place ,,,there u go bobs ure uncle

Posted on Jan 29, 2009

  • 1118 Answers

SOURCE: 2006 pontiac grand prix vary little or no heat

Are you sure you got all the air out of the cooling system? Air pockets are very common problem when you do any work to the cooling system. An air pocket will do what you discribe.

Posted on Mar 18, 2009

  • 451 Answers

SOURCE: How do replace heater core in 2002 Pontiac Gran Prix

i do believe you have to take the passengers side dash apart behind the glove compartment. go to autozone and get a manual or go to the library and check the chiltons manual. this is not an easy job. how bad is the leak? if its not bad these heater cores are made of all aluminum. i would buy a bottle of that radiator additive and see if that takes care of the problem first. it only cost about 5 bucks a bottle and it may permanantly fix your problem.

Posted on Aug 13, 2009

  • 6982 Answers

SOURCE: Pontiac Grand Prix Drivers side window won't go down

Most often on those the motors are shot. as soon as they are activated they overheat and slow down or stop. Only way I know of to repair is to replace them. You will need a manual to do this or do them one at a time so you can check how it goes back together by looking at other one. Motors are riveted in and need to be drilled to remove...use small bolts to re-attach.
I've seen motors online for about $30-40 each.

Posted on Aug 28, 2009

  • 2 Answers

SOURCE: I have water leaking into the car on the passenger

sounds like your heater core is leaking

Posted on Mar 11, 2010

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1 Answer

How to flush a heater core in a pontiac grand prix 2002


If you have warm air on one side and cool on the other, you've a situation with the vent flaps. But to backflush the core, take both hoses off the core and run a garden hose to the outlet side going towards the water pump. This will flush it.

Aug 31, 2014 | 2002 Pontiac Grand Prix

1 Answer

Heat not working on the drivers side


The heater core may be plugged up so that no coolant flows, thus no heat at all.

Jan 27, 2014 | 1999 Pontiac Grand Prix

1 Answer

I have a 2005 grand prix and my floor on the passenger side is soak with water or coolent. Is my heater core bad or can I just blow it out with a air compressor?


most of the time when you have a blown heater core they are incased and there radiator fluid wont access the car if it dose then you can by pass the heater core by attaching a piece of hose between the two hoses that go the fire wall and just drive with no heat dose not damage the vehicle and will not harm anything you just might get cold if you in cold temps other then that you should be fine. now you said its on the driver floor if you smelt it it could just be water but if it smells like radiator fluid them it could have leaked under your whole dash and onto the driver flool i would be carefull and play it on the safe side and find someone to take a look at it

Feb 16, 2012 | 2005 Pontiac Grand Prix

3 Answers

Water on floor passenger side after it rains and after air has been running 2000 grand prix


Ac hose leak?
leaking heater core?

Hint: it leaks when it RAINS

If it were related to the heater core or the AC drain, it would be leaking when it is not raining also, so those diagnoses are not logical.

The grand prix has a long history of floor leaks from seal failures around the air intake under the windshield cowling, where RAIN water runs in.

May 04, 2011 | 2000 Pontiac Grand Prix

2 Answers

The heat in my 99 Grand Prix GTP only works on the passenger side of the car. The blower works fine but only blows cold air on the driver side. Is this the heater core or possibly a fuse. Any suggestion...


I'm having the same problem with a 2000 GTP. I think the problem is a stuck or malfunctioning heater actuator door (LH). I don't have a error code on the HVAC display (flashing man) so I think its a mechanical failure rather than a sensor / voltage issue. I plan to fix within the next week. I'll post a follow-up response.

Nov 04, 2010 | 1999 Pontiac Grand Prix

1 Answer

Leaking water from heater core 1999 gran prix


If leaking coolant under dash on passenger side floor broad it's your heater core. Call's for 2.8 labor flat time to remove heater core, in some case's you'll have to recover, evacuate and recharge your A/C system to remove your heater core.Sit under dash on passenger side.

Dec 28, 2009 | 1999 Pontiac Grand Prix

1 Answer

Wet floorboard


the water could have just traveled. check the heater core.it might be bad.

Jul 15, 2009 | 2004 Pontiac Grand Prix

1 Answer

1994 pontiac grand prix leaking water


It sounds like either the heater valve which may be located inline with a 5/8" hose or 3/4" hose or the heater core is leaking, a heater core is like a small radiator.

Feb 19, 2009 | 1994 Pontiac Grand Prix

1 Answer

I need to replace my heater core


Bad news. You will have to remove the entire dash board to replace that heater core. Sorry

Jan 12, 2009 | 1994 Pontiac Grand Prix

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