Question about 1994 Pontiac Grand Am

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Heater core if the heater core is bad will it drain from a drain tube beside the ac lines on a 94 grand am

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  • hwbiv Jul 11, 2010

    it may can you send a picture

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If anti-freeze is actually coming out of the drain tube then yes, you could very well have a bad heater core. You may also be able to smell antifreeze while inside the vehicle if it is leaking. [Its a kind of sickly sweet smell] If just clear water is dripping out then this is most likely from normal condensation that is collecting and dripping off of the air conditioning evaporator core as the air conditioner runs. This condensation collects in the heater, a/c housing then drips out of the same little drain. Water from normal condensation will evaporate off of cement or pavement pretty quickly but antifreeze takes quite a while to evaporate away and feels slimy to the touch. It doesn't take much of an antifreeze leak before the cooling system gets low on so make sure you don't run low on coolant which can cause the engine to overheat.

Posted on Jul 11, 2010

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1 Answer

Heater core


Sounds like a bad heater core. You will get steam/vapor out of vents from this. If you are referring to the over flow tube being the evaporator drain tube at the firewall its because the heater core shares the same case with the A/C and its filling up with anti-freeze.

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Ac hose leak?
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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.

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1 Answer

My ac is causing moist air to blow from the vents making the windows fog up. It also drips water from the pasenger side under the dashboard, what needs replaced


check for a heater core leak, and also the ac drain may be plugged from the condensor. if lines are ok , then its the heater core. it will cause window to fog up if bad. more so in winter, it will put a film of anti-freeze all over window on inside!

Aug 20, 2010 | 1994 Pontiac Grand Prix

1 Answer

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sounds like a heater hose or heater core has gone bad.

Jul 11, 2010 | 1994 Pontiac Grand Am

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If you are getting clear liquid, with the A/C on, then you have a clogged drain tube. If it is green or reddish, you have a bad heater core. Should be able to have someone blow out the drain tube to clear it out.

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If you have a new heater core inside, some of the probable causes of your lack of hot air include the two heater hoses, heater control cable, water pump, and damper/vacuum door. A handy diagnostic article that explains this will is the following:
http://yourhandymanzone.com/Your_Handyman_Zone_How_To_Pages_Vehicle_Car_Zone_Cars_Trucks_Vans_Heating_System_Heater_Blowing_Little_No_Hot_Air.htm

Hope this helps!
Brad

May 27, 2009 | 1996 Pontiac Grand Am

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