Question about 1997 Pontiac Grand Am

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Leaking coolant water

Smalll hose underneath the engine towards the firewall is leaking as it looks like a possible drain outlet. Shaped like a number 7. Currently just water coolant water running right through it. Would like to know if this is a drain plug and what I need to get it repaired.

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  • matthewmil_1 Feb 08, 2009

    I have a 97 grand am with a similar leak. It comes out of a black l shaped hose that come of the firewall by the heater core. This Hose has no damage and swivels back and forth by hand. When water is put in the radiator it runs out this hose instantly almost. this all happens while the engine is off. I need to know what goes to that hose if anything and if the repair is a major one.

  • Spuddlz Mar 22, 2009

    I am trying to fix this exact problem. I can see where the heater core hoses connect. This L shaped hose that was described by Oceanfront is further toward the passenger side than the heater core hoses. I wonder if it is an overflow from the heater core compartment? I would think that moisture would be showing up inside the vehicle if this were the case. An added note, once the vehicle has warmed up, steam is seen coming from the defrost.



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This L shaped hose is a drainage for the heater core compartment. Once we removed the panel to the heater core it was obvious the heater core was leaking into this compartment. We changed the heater core out and the problem has been solved :)

Posted on Mar 24, 2009

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Hi Oceanfront 98!

The small hose goes to the heater core inside the car. Not being able to see the the piece you describe, I can't tell for certain... it might be a drain, but is more likely a control valve, regulating the amount of coolant directed to the heater.... But whatever it is, the leak needs to be fixed.

The most common problem is a loosened hose clamp --- make sure the clamps are secure, The next most common problem is a crack in the heater hose --- if this is the problem, there is usually enough hose that it can be trimmed back an inch or two (after loosening clamp and removing the hose from its fitting) and reattached and clamped, providing the crack is at the fitting. If there is not enough slack, or if the hose is cracked further downstream, then the hose needs to be replaced. The third possibility is that the drain / valve is leaking itself --- and this would also require replacement.of the faulty part.

A temporary fix can be done by bypassing the heater core and valve --- this is done by connecting a hose directly to the two fittings on the engine where the two hoses from the firewall were connected. This will stop the leak, but you will not have interior heating.

Hope this gets you going, AND PLEASE don't forget to rate my assistance!!! Your rating is my ONLY compensation for answering your problem... and all too often my good advice goes unrated and forgotten!!! Good luck, don't hesitate to ask if you need further help or have a comment, and God bless!


Posted on Jul 02, 2008

  • Bill Bellomy
    Bill Bellomy Jul 09, 2008

    Hello Oceanfront 98!

    This problem and solution still shows up in my unsolved problems folder, and I was curious if you have been notified or have read this. Just post a short comment if you have, and I should be notified...





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