Question about 1994 Pontiac Grand Am

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Pontiac grand am 1994 water comes out overflow

This problem started after a mechanic replaced the heater core and the associated hoses. When the car was started for the first time after the work was finished it sounded great, but within five minutes the overflow tube popped off and the contents of the radiator shot out through it. The water was not hot. We ensured there was no problems with the connection to the fill bottle spout and the hose. Tightening the hose to it's limits will not hold it. The water will shoot out every time after about five minutes. Is it possible a hose is on the heater core so that pressure is going against itself?

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It almost sounds like the water pump isnt working right

Posted on Feb 12, 2009

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First question: why was the heater core replaced. Was it leaking water inside the car? Or was it replaced due to no heat inside the car. If it was replaced due to no heat inside the car, the shop you had taken it to shouldn't have replaced the heater core until they conducted tests of why there was no heat even if the customer insists on replacing the heater core. The reason why I'm asking is there's a possibility of the head gasket was leaking causing the poor circulation of the water to the heater core. If so, you may have replaced the heater core for no reason and most likely cost you a bunch of money. I live by this rule in our shop: DON'T JUST THROW PARTS AT THE CAR! You 'll end up spending way more money than you needed to.

Posted on Feb 12, 2009

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1 Answer

Replace heater core in pontiac grand am


Depends on your mechanic. I can tell you how its done: Replacing the heater core in a Pontiac Grand Am is simple enough. But reaching the core is another matter. It is positioned behind the instrument panel, which must be removed. Confirm etc---------------------------------------------------------------------------------------
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Heater core plugged how do you flush it.


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Dec 10, 2011 | 1991 Pontiac Grand Am

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Heater blows air on low u can feel some warmth (barley) when i feel my hoses coming off my water pump to the heater core ones hot and one is cool.


sounds like there is a blockage in the heater core. I would sugest taking the hoses loose and using a garden hose see if water can flow thur the core. If it dont flow thru the core you might have to replace the core.

Mar 01, 2011 | 2006 Pontiac Grand Prix

1 Answer

Heater core leak on a 1994 pontiac grand am se


first check to make sure that the hose,s back there didn't crack / of there fine then the heater core has blowen open and is know leaking / if you are in an aera that diesn't get real cold take the hoses off and route one to the other till you can get it fixed

Feb 25, 2010 | 1994 Pontiac Grand Am

1 Answer

Replace heater core in 1994 pontiac grand am


Removal & Installation


  1. Disconnect the negative battery cable.
  2. Drain and recycle the engine coolant.
  3. Raise and safely support the front of the vehicle.
  4. If necessary, remove the rear lateral transaxle strut mount.
  5. Detach the drain tube, then disconnect the heater hoses from the core tubes.
  6. Carefully lower the vehicle.
  7. Remove the console if equipped.
  8. Unfasten and remove the sound insulators, console extensions and/or steering column filler, as required.
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Unfasten the sound insulator retaining bolts ...

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... then remove the sound insulator

  1. On some models it may be necessary to remove the steering column opening filler.
  2. Remove the floor or console outlet ductwork and hoses.
  3. Remove the heater core access cover.
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Remove the heater core access cover

Unfasten the heater core mounting clamps/bolts, then extract the heater core from the vehicle.

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Unfasten the heater core retaining bolts; most later models are secured with clamps.

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Remove the heater core from the vehicle

To install:
  1. Install the heater core, then secure using the clamps/bolts.
  2. Fasten the heater core cover.
  3. Connect the outlet hoses and ducts.
  4. Install the sound insulators, console extensions and/or steering column filler.
  5. Raise and safely support the vehicle.
  6. Install the drain tube and connect the heater hoses to the core tubes.
  7. If removed, install the rear lateral transaxle strut mount, if removed.
  8. Carefully lower the vehicle.
  9. Connect the negative battery cable.
  10. Fill cooling system and check for leaks. Start the engine and allow to come to normal operating temperature. Recheck for leaks and check coolant level. Add if necessary.

Nov 13, 2009 | 1994 Pontiac Grand Am

1 Answer

Water leak overflow hose......


The hose you are referring to is the drain from the heater box...gets rid of condensation from the a.c. don't connect it to anything. But, If any antifreeze (not plain water) is coming out of there, then you likely have a heater core leak. That said, if the engine is not running hot and you aren't loosing antifreeze, the level sensor in the tank is bad.

Jun 15, 2009 | 1994 Pontiac Grand Am

2 Answers

Pontiac Grand Am cooling system


A rubber elbow coming out of the firewall is probably the a/c evaporator drain. However, the heater core could be leaking and entering the evaporator case and coming out of that drain. Are you sure coolant is coming out of that elbow and not plain water?

May 09, 2009 | 1994 Pontiac Grand Am

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 want to flush the heater core


Take off the hoses at the bulkhead/firewall that go to te heater core, use a garden hose and back flush the core by forcing water through the smaller of the 2 hose nipples, if the water runs right through then you have a heater air temp control door actuator problem

Dec 24, 2008 | 2005 Pontiac Grand Prix

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