Question about 2001 Pontiac Montana

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Heateer core leak

I have a leak in the heater core of a 2001 Pontiac Montana.
I live in Florida and don't need heat in a car with 110,000 miles. Can the heater core be By-passed easily and the car still have the cooling effeciency it needs to function properly?

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  • Jay Glendenning
    Jay Glendenning May 11, 2010

    You can disconnect the heater core hoses and get a small piece of pipe to fit them together ... that will bypass and not affect the a/c

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  • 490 Answers

Yes you can take the 2 hoses going to the heater core and join the 2 together under the hood so that coolant flows thru the hoses but not thru the heater core

Posted on Apr 16, 2009

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Posted on Jan 02, 2017

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How to change a bad thermostat on a 2003 3.4L pontiac montana


put in a radiator flush ,run it for 20 miles it can be a blocked core in both the radiator and the heater.that should clean it. then refill with a 50/50 mix anti freeze then bleed it of air. put your heater on full .run the engine on tick over.then push in the radiator hose to push the air out of the expansion bottle cap .it is off . then refit your cap.

Dec 30, 2013 | 2003 Pontiac Montana

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Have a 2001 montana, ENGINE does not overheat, but has no heat out of heater core, replaced the thermostat.


Could be a blend door problem under the dash.
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Jul 01, 2012 | 2001 Pontiac Montana

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Get the radiator and heater core, hoses and thermostat replaced. Also replace the mixing valve if needed. A radiator shop could give you an estimate and diagnose the problem better than I can online. I hope sincerly that this helps.

Mar 16, 2011 | 2003 Pontiac Montana

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My 2001 montana has heat then no heat and heat again it does'nt overheat it reads normal but just wondering how to fix this as we bled out the screws fluids are good too


Usually when that happens the radiator is a little low on coolant. I know on some 2000 models they have an electric pump that will help circulate coolant to the heater cores of the front and rear, this does help some.

Mar 08, 2011 | 2001 Pontiac Montana

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CHECK THE HIGHT OF THE HEATER MATRIX IN THE CAB , IF ITS HIGHER THAN THE FILLER/EXPANSION TANK. THEN ITS AN AIR LOCK, LOOK FOR THE HIGHEST PIPE AND SEE IF THERE IS A BLEED VALVE, IF NOT TAKE BOTH PIPES OFF THE MATRIX FEEDS AND FLUSH OUT TO SEE IF IT IS BLOCKED, AND RECONNECT LOWEST PIPE FIRST AND FILL SYSTYM TILL WATER APPEAR FROM TOP AND RECONNECT RUN MOTOR, AND KEEP TOPIN UP

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There is a flap in the venting itself that can get stuck. Or the actuator that moves it can become faulty. It is located above heater core and it's housing. You will have to remove bottom console to access it.

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Might be a weak or failing water pump... Does it leak antifreeze or do you have to add antifreeze very often? When the engine gets to operating temperature squeeze the top radiator hose and see if you can feel pressure from the water pump forcing water through it.

Feb 21, 2009 | 2001 Pontiac Montana

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