Question about Dodge Durango

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Heater hose broken

Heater hose broke at the "Y" fitting at the passenger side firewall. Can I just bypass the heater core completely. I don't use the heater, temperature in my area in the summer is above 100%.

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  • eric_breitig Jul 07, 2010

    So if I add a valve, were in line with the heater core do I run it?

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  • Dodge Master
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Bypass - no, it would be like a short for the cooling system, a sure way to overheat the engine. But you can just close it completely by adding another valve on the hose and closing it.

Posted on Jul 07, 2010

  • Azrael SRL Jul 07, 2010

    After it so  with the other regular valve closed the heater will be completely cut off the circuit.


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The vehicle data is always helpful, year, model, engine, etc. A picture is also helpful to correctly identify components. Working with what has been provided, consider that the heater core receives a flow of engine coolant from the coolant pump. This flow can be on or off depending on the position of the heater control valve. By-passing the heater core with a hose, or a connector joining the existing hoses together, is essentially the same as the operating mode of heat on, meaning the same as when the valve is open to allow flow through the heater core. Hence, by-passing the heater core is generally safe and could be a useful solution to your problem.

However, capping off a cooling system heater core circuit is identical to the mode of the system with the heater control valve off. This could be an equally effective solution, if performed in a way that will last.

Considering the similarity of either choice, and the execise required, why not consider performing the repair correctly by changing the "Y" fitting.

Point to consider: If you live in 100+ climate, the condition of the cooling system is very important. It is very easy to bring an engine to a temperature that will cause serious damage just trying to make it home or to a vehicle service workshop. Keeping the system clean and full through regular maintenance is the best defense.

Posted on Jul 08, 2010

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Posted on Jan 02, 2017

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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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Sounds like those are the heater core hoses. some cars have the A/C hooked to those hoses also. Trace the hoses and see where they they go on the engine. You might be able to take one hose and bypass the heater core by taking off one hose off the firewall and putting it where the opposite one goes on the moter. If not you can take them off the firewall and get a metal pipe and join them together. Hope this helps.

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How do i bypass the heater core


LOOK at the firewall under windshield engine side ,u will see two hoses coming out of firewall does are the heater core hoses, follow them going to the engine, once u locate where they are connected in the engine just connect does two ends with other hose same type and disconnect, remove or cut the hoses in the firewall side, this is how u bypass the heater core it will be no water going inside the core so the leak will stop

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1 Answer

Is it okay to by-pass just ONE heater hose on my 1994 camaro Z28. The hose broke right at the flow fitting.


No - you must bypass both hoses by joining them together to keep the system closed. If, for example, you have 5/8 inch heater hoses, you can buy an adapter that will fit into both sides of the heater hose to bypass the heater core. It's easiest to pull both hoses off the firewall and then put the adapter there, making sure to tighten the clamps so you don't lose coolant and overheat your vehicle.. I'm not too sure where the break is by your description, but you have to make sure there are no unconnected hoses or you will lose all of your coolant
Hope this helps!

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1 Answer

I need to replace the heat core in my blazer... how do i do this?


Draining the Cooling System
  • Park the vehicle on a level surface. If the engine has been running allow it to cool completely.
  • Drain the cooling system. Remove the radiator cap from the radiator. Locate the petcock valve on the lower corner of the radiator. Place a waste oil collection pan underneath the petcock valve and turn it counterclockwise to open. Allow the cooling system to drain completely.
  • Label and remove the heater hoses from the heater core. The heater hoses will connect to the heater core in the engine bay, on the firewall, on the passenger side of the vehicle. Use either the Phillips or the flat-blade screwdriver to loosen the hose clamps that secure the hoses to the heater core. Then pull the hoses off the heater core.
Removing the Heater Core
  • Remove the heater core cover. Move to inside the passenger compartment. Locate the heater case. It will be bolted to the firewall, below the dash on the passenger side of the vehicle. Use an appropriate sized socket or wrench to remove the five screws that connect the heater core cover to the heater case, and remove the cover.
  • Remove the steel straps that secure the heater core to the heater case. Unscrew the four screws that connect the steel straps to the heater case using a socket or wrench and remove the straps.
  • Remove the heater core by pulling it out of the heater case.
Installing the Heater Core
  • Place the new heater core into position inside the heater case. Be sure to carefully guide the inlet and outlet tubes through the holes in the firewall.
  • Reinstall the heater core retaining straps, by reinstalling the four screws that secure them.
  • Place the heater core cover into position over the heater case and reinstall the five screws that secure it.

Refilling the Cooling System
  • Reconnect the heater hoses to the heater core. Slide the hoses onto the inlet and outlet fittings that extend through the firewall, and tighten the hose clamps.
  • Close the petcock valve on the lower corner of the radiator by turning it clockwise.
  • Refill the radiator with a 50/50 mix of antifreeze and water.
  • Reinstall the radiator cap onto the radiator.
  • Run the engine and visually inspect for leaks.
Good luck and take your time, keep me posted and don't forget to rate please.

Jan 08, 2010 | 1989 Chevrolet S-10 Blazer

1 Answer

What do i have to remove to replace the heater core in my 1991 chevy s10 with a 2.8 v6


Draining the Cooling System
  • Park the vehicle on a level surface. If the engine has been running allow it to cool completely.
  • Drain the cooling system. Remove the radiator cap from the radiator. Locate the petcock valve on the lower corner of the radiator. Place a waste oil collection pan underneath the petcock valve and turn it counterclockwise to open. Allow the cooling system to drain completely.
  • Label and remove the heater hoses from the heater core. The heater hoses will connect to the heater core in the engine bay, on the firewall, on the passenger side of the vehicle. Use either the Phillips or the flat-blade screwdriver to loosen the hose clamps that secure the hoses to the heater core. Then pull the hoses off the heater core.
Removing the Heater Core
  • Remove the heater core cover. Move to inside the passenger compartment. Locate the heater case. It will be bolted to the firewall, below the dash on the passenger side of the vehicle. Use an appropriate sized socket or wrench to remove the five screws that connect the heater core cover to the heater case, and remove the cover.
  • Remove the steel straps that secure the heater core to the heater case. Unscrew the four screws that connect the steel straps to the heater case using a socket or wrench and remove the straps.
  • Remove the heater core by pulling it out of the heater case.
Installing the Heater Core
  • Place the new heater core into position inside the heater case. Be sure to carefully guide the inlet and outlet tubes through the holes in the firewall.
  • Reinstall the heater core retaining straps, by reinstalling the four screws that secure them.
  • Place the heater core cover into position over the heater case and reinstall the five screws that secure it.

Refilling the Cooling System
  • Reconnect the heater hoses to the heater core. Slide the hoses onto the inlet and outlet fittings that extend through the firewall, and tighten the hose clamps.
  • Close the petcock valve on the lower corner of the radiator by turning it clockwise.
  • Refill the radiator with a 50/50 mix of antifreeze and water.
  • Reinstall the radiator cap onto the radiator.
  • Run the engine and visually inspect for leaks.
Good luck and take your time.

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1 Answer

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The heater core is located on the passenger side of the vehicle. If this has been bypass the core is surely leaking. The heater core pipes should be visible from un der the hood, passenger side of vehicle towards the firewall. keep me posted, and keep an eye on that heater core, there is reason for the prior owner not to have heat.

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