Question about 1999 Dodge Durango

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Air is not blowing cold

I bypassed the smal heater core inside the vehicle by disconnecting the heater hoses Air conditioner shows to be working good good hig and low pressure the compressor cycles like it should but still blows like it is the outside air. Help I now have the vehicle in Costa Rica Thanks

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All blend air doors moving as they should?

Posted on Nov 06, 2008

  • Mike Butler
    Mike Butler Nov 06, 2008

    Can you hear things moving when you switch from heast to cool under dash?

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Air is not blowing fast

Posted on Jul 15, 2010

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1 Answer

Heater in 1995 Bronco is blowing cold air....What could be causing this?


If the heater is blowing cold air and the car is overheating, it is likely that the problem is related to the engine cooling system as well. The following are some issues that may be causing the heater to blow cold air:
  • Low coolant levels
  • A plugged/clogged heater core
  • A faulty thermostat (thermostat that is stuck)
  • Broken blower and/or blower motor
  • Heater core bypass hoses that have leaks
  • Heater core bypass hoses that are worn
If your car is overheating and/or your heater is not working, it should be inspected and diagnosed as soon as possible.

Nov 15, 2016 | Cars & Trucks

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Heater blows cold air--where is heater control flap or switch?


These cars are notorious for having blocked heater cores, causing the heater to blow cold air. That's because there is a heater core bypass hose near the firewall that allows the coolant to bypass the heater core. Eventually the heater core fills with gunk and no coolant passes through it. You'll need to disconnect the hoses from the heater core at the firewall and flush the core using a garden hose. Flush both ways till water runs clear. If you can't access the heater core fittings at the firewall, then follow the hoses from these fittings back to the engine and disconnect them at that point and flush from there. If you flush from the hoses in this manner, it is important that you clamp off the bypass hose at the firewall with a vice grip pliers.
Otherwise the flushing water will go through the bypass hose and not the heater core.

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Dec 21, 2015 | 2001 Ford Taurus

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2003 mercury sable blows cool air when heater is turned on.


Most likely it is a clogged heater core. Have your heater core reverse flushed or your blend door is stuck open.

Oct 10, 2014 | 2003 Mercury Sable

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No heat in 1996 grand cherokee


you could be low on antifreeze/water fluid or you have a blockage on your heater core.. I have a problem with my heater core being plugged.. Try disconnect the hoses to the heater core and see if water will flow through it or you can use air to blow through it.. Good luck

Dec 19, 2013 | 1996 Jeep Grand Cherokee

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Heater blowing only cold air


you may have a clogged heater core or heater core bypass valve may be stuck closed. bypass valve is usually on the firewall on one of the heater core hoses. if valve seems to be operating properly. you will need to let the vehicle cool down. disconnect both heater hoses. connect garden hose to one side of heater core let water run through one side and then the other side. if the heater core is too clogged it may need to be replaced.

Jan 17, 2013 | 1993 GMC Sierra

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1998 windstar heater blows cold air


I used to have this vehicle. There are a couple of things that can cause this. In my case there was a disconnected vacuum line that caused the air to only blow through the defrost vents. The vacuum hose beneath the passenger side cowl is probably disconnected. It is behind the engine just below the passenger side windsheild wiper.

The other possibility if all of your vents are working and the air is just cold, could be because the heater core bypass valve vacuum hose came off. Check to make sure the heater core hoses have hot coolant flowing through them when the engine is at operating temp and while running.


The last possibility for this vehicle is the actual HVAC panel with your controls on it. This panel has colored vacuumn lines connected to it that like to break off over time. The switches themselves will sometimes leak air preventing it from functioning correctly.


Hopefully this gives you some clues on where to look.

Nov 24, 2012 | 1998 Ford Windstar

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Vehicle won't blow hot air. The fan works, but only cool air regardless of the temperature setting


IF YOU HAD A BAD HEATER CORE OR WATER LEAKING INSIDE THE CAR THEY PROBABLY BYPASS YOUR HEATER CORE. THE HEATER CORE IS WHAT CAUSE THE INSIDE THE CAR TO WARM UP

Nov 17, 2012 | 2005 Chevrolet Blazer

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The heater is blowing cold air


heater control valve not allowing radiator water to flow through the heater core where the heater blower motor blows the heat that radiates off the heater core into the vehicle cheap fix or you can bypass yourself by replacing valve with piece of 3/4 copper pipe and 2 hose clamps

Jan 03, 2011 | 1998 Dodge Caravan

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We just bought a 1999 GMC Jimmy and the heater doesn't work. The fan blows but there is no heat. The air conditioner works fine.


Could be that the heater core is disconnected, there are two hoses that attach to the heather core that come out of the engine, this provides hot water to the core thus making the heater work, when the heater core starts leaking water the quick and fast fix would be to bypass the heater core and connect the two hoses together, check under the hood on the left passenger side there should be two hoses about 1" thick see if there are connected together or of they seem to be connected to 2 outlets that come out of the inside of the vehicle. people do that specially if selling vehicle.

Sep 06, 2010 | 1999 GMC Jimmy

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When I turn on the air conditioner it is blowing hot air as if the heater were on. Could it be a fuse? It was working fine yesterday.


heater core is going bad my dodge ram truck did the same thing for about three months then steam startedcoming out of the vents it was antifreeze i have not fixed it yet i just bypassed it for now cause its hot and i have to take the dash completly out to get to it, and yes my airconditioner was blowing out hot now immediatly after i bypassed it blows cold again.you have to find where it goes into the motor on both sides so follow the hoses from firewall then buy a 3ft hose to go from one side of motor to the other problem fixed! well that is you wont have a heater until you change the heater core

Jul 07, 2009 | 1999 Mercury Sable

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