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How to repair coolant bypass hose - Cars & Trucks

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On what make and model please

Posted on Dec 02, 2012

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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.

heater-blows-cold-air-heater-control#solution-section-hn15hvgbess52pvw4lrkzak3-4-1.jpg

Dec 21, 2015 | 2001 Ford Taurus

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I just changed the thermostat in my 2000 dodge Durango and its leaking more water now than it did before I replaced. What could be the problem?


Dodge Dakota Coolant Leak Repair - Including Bypass ...

? 24:00
www.youtube.com/watch?v=3lhfurJVzcM
Aug 11, 2012 - Uploaded by mreinsmith Dodge Dakota Coolant Leak Repair - Including Bypass Hose, ....yup my 2000Dakota had I leaking bypass I put in New water pump thinking ..... Dodge Durango 4.7 coolant, thermostat, and auxiliary water pump replacement.

Feb 26, 2015 | 2000 Dodge Durango

2 Answers

How do I bypass the rear auxiliary heater core?


U must connect the coolant in hose to the coolant out hose with a u type metal hose by passing the heater core all together

Sep 13, 2014 | 2003 GMC Envoy

2 Answers

Heater doesnt work but ac does


Assuming the fan blows OK but you have no heat. Go to the firewall and notice where the heater hoses enter and exit the cabin. You'll notice a metal manifold and also a rubber bypass hose that connects the two. This bypass hose is a design problem and causes the coolant to bypass the heater core which is located inside the cabin under the dash. Over time, the heater core gets blocked by gunk and you'll get no heat. All the coolant flows through the bypass hose when this happens. The fix is to flush the heater core itself. It's difficult to access at the firewall, so I disconnect the two hoses at the engine itself and attach a garden hose to flush it. Before doing this you must clamp (vice grips) the bypass hose so that all of the water goes through the heater core.

Jan 24, 2014 | 2001 Ford Taurus

1 Answer

I have no heat on my 93 silverado. i have replaced the heater core,thermostat,and radiator. I checked the blend door while I had the heater core out and it works fine.With the heater hose that goes to the...


LOOKING AT HEATER CORE TOP HOSE COOLANT FLOW IN BACK OUT THROUGH THE BOTTOM HEATER CORE HOSE CHECK WATER PUMP BYPASS HOSE SEE IF IT GETS HOT.IF NOT COULD BE BLOCKAGE AT BYPASS HOSE FROM WATER PUMP OR WATER COULD BE FAULTY GETTING TOO WEAK PUMP COOLANT THROUGH SYSTEM.IF COOLANT GETTING HOT GOING TO HEATER CORE THE HEATER CORE AND COOLANT SYSTEM NEED FLUSHING OUT.

Dec 05, 2010 | 1993 Chevrolet Suburban

1 Answer

Coolant leak coming from the center of the car, under the engine


Looks like bypass hose or engine coolant plug just got leak! look at ur coolant reservoir, it might overflowing when ur engine heats up and its dripping towards the engine! Look and search all the hoses in the side of the engine and reservoir! If its the bypass hose, there will be a difficulty in removing and replacing it, but u could fix it! taah!

Nov 12, 2010 | 2000 Mitsubishi Eclipse

1 Answer

How to replace a fuel pump on a 1994 jeep grand cherokee?


I'm assuming that your Jeep have a 5.2L V8 engine (as mine), then check this procedure...

Grand Cherokee 5.2L Engines
(see Figure 6)
  1. Disconnect the negative battery cable.
  2. Open the radiator valve and drain the cooling system.
  3. Remove the cooling fan and shroud as an assembly.
  4. Remove the accessory drive belt.
  5. Remove the water pump pulley from the hub.
  6. Disconnect the hoses from the water pump.
  7. Loosen the heater hose coolant return tube mounting bolt and nut and remove the tube. Discard the O-ring.
25b04d0.jpg

Fig. 6: Water pump mounting bolt locations
  1. Remove the water pump mounting bolts.
  2. Loosen the clamp at the water pump end of the bypass hose. Slip the bypass hose from the water pump while removing the pump from the engine. Discard the gasket.
To install:
  1. Clean all gasket mating surfaces.
  2. Guide the water pump and new gasket into position while connecting the bypass hose to the pump. Tighten the water pump bolts to 30 ft. lbs. (40 Nm).
  3. Install the bypass hose clamp.
  4. Spin the water pump to ensure the pump impeller does not rub against the timing chain cover.
  5. Coat a new O-ring with coolant and install it to the heater hose coolant return tube.
  6. Install the coolant return tube to the engine. Ensure the slot in the tube bracket is bottomed to the mounting bolt. This will properly position the return tube.
  7. Connect the radiator hose to the water pump.
  8. Connect the heater hose and clamp to the return tube.
  9. Install the water pump pulley and tighten the bolts to 20 ft. lbs. (27 Nm).
  10. Install the accessory drive belt.
  11. Install the cooling fan and shroud.
  12. Fill the cooling system.
  13. Connect the negative battery cable.
  14. Start the engine and check for leaks.

Other details can find in your repair manual ZJ-Secc-7-Cooling-System

Hope thats help.

May 04, 2010 | 1994 Jeep Grand Cherokee

1 Answer

How to install a water pump on 99 durango


  1. Clean gasket mating surfaces.
  2. Using a new gasket, install water pump to engine as follows: Guide water pump nipple into bypass hose as pump is being installed. Install water pump bolts Tighten water pump mounting bolts to 40 N·m (30 ft. lbs.) torque.
  3. Position bypass hose clamp to bypass hose.
  4. Spin water pump to be sure that pump impeller does not rub against timing chain case/cover.
  5. Install a new O-ring to the heater hose coolant return tube Coat the new O-ring with antifreeze before installation.
  6. Install coolant return tube and its mounting bolt to engine Be sure the slot in tube bracket is bottomed to mounting bolt. This will properly position return tube.
  7. Connect radiator lower hose to water pump.
  8. Connect heater hose and hose clamp to coolant return tube.

Jan 11, 2009 | Dodge Durango Cars & Trucks

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