Question about 2004 Dodge Ram 1500

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Repair heater coil leak without replacement. - 2004 Dodge Ram 1500

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Over the counter stuff will not work and repairs are not that easy. A certified mechanic is needed for this type of repair and you'll be better off by having the coil replaced.

Posted on Jun 30, 2009

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98 caddy deville nothstar v8 how to replace heater coil have no heat and I'm loosing water somewhere


the heater core in a 1998 Cadillac is very tricky to replace.
start with getting a pressure test to determine where the exact location of the leak is, it may not be the heater core.
if you do decide to pull the dash apart to change the core make sure the battery is disconnected for at least an hour to allow the airbag system to discharge.

Oct 11, 2012 | 1998 Cadillac DeVille

1 Answer

My radiator started leaking and my mechanic said that he replaced the heater coil. What is a heater coil and would it cause my radiator to leak?


Your heater coil is most often located in your vehicle's firewall. To find it, locate your water pump on your engine block and follow the water hoses back to the firewall. Where these hoses end you will find your heater core. To answer your question, no, your heater coil will not cause your radiator to leak. They are two separate units.

Aug 31, 2011 | 1994 Buick Skylark

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Heater coil on a 1999 ford expedition how hard is it to change out?


Inspect/Replace If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
When a heater core leaks, a new heater core is installed or the old one repaired.
Heater Housing
  • The heater housing is usually under the dash and must be removed to gain access to the heater core.
  • Procedures for replacing the heater core vary with the year, make, and model of car. It threfore necessary to consult the manufacturer's repair manuals for the proper procedure for replacement.
f74-01.gif The heater housing is disassembled to get to the heater core. Heater Core
  • Remove the access panels(s) or the split heater/air conditioning case to gain acess to the heater core.
  • Remove the heater coolant hoses.
  • Remove the cable and/or vacuum control lines (if equipped).
  • Remove the heater core securing brackets and/or clamps.
  • Lift the core from the case. Do not use force. Take care not to damage the fins of the heater core when removing.
  • To reinstall the heater core, reverse the removal steps.
When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.

Dec 03, 2010 | 1999 Ford Expedition

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Can I get to the Heater Core without going through the engine. (Maybe the side wall?)


Inspect/Replace If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
When a heater core leaks, a new heater core is installed or the old one repaired.
Heater Housing
  • The heater housing is usually under the dash and must be removed to gain access to the heater core.
  • Procedures for replacing the heater core vary with the year, make, and model of car. It threfore necessary to consult the manufacturer's repair manuals for the proper procedure for replacement.
f74-01.gif The heater housing is disassembled to get to the heater core. Heater Core
  • Remove the access panels(s) or the split heater/air conditioning case to gain acess to the heater core.
  • Remove the heater coolant hoses.
  • Remove the cable and/or vacuum control lines (if equipped).
  • Remove the heater core securing brackets and/or clamps.
  • Lift the core from the case. Do not use force. Take care not to damage the fins of the heater core when removing.
  • To reinstall the heater core, reverse the removal steps.
When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.

Nov 18, 2010 | 1983 Buick LeSabre

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Leaking anti freeze on passenger side floor board. Possible leaking heater coil but do not know how to change it. Thanks


YES ITS A HEATER CORE LEAKING BEST TO TAKE IT TO A REPAIR SHOP WITH A/C IS ABOUT 4 HOURS WITHOUT A/C ABOUT 3 HOURS

Oct 13, 2010 | 1980 Chevrolet Corvette

1 Answer

Need to replace heater raidator under dash.anyone done one


The heater "coil" almost always requires removal of the entire dashboard and it's not much fun. You shouldn't even think about it without at least a Chilton's (or other) manual unless you're pretty used to disassembling and reassembling complex components. If it's leaking antifreeze, you can bypass the heater for now (brrrr) by splicing the heater coil's inlet and outlet hoses together. In the engine compartment look for two hoses, same sized, that are leading into your firewall. They'll be right next to each other, usually one above, rather than beside the other. They'll be the only hoses with anti freeze that attach to the firewall. Pull both hoses from the firewall and insert a splice, connecting these hoses. Secure with hose clamps. This will seal the coolant system and bypass the heater. The car will be perfectly safe to drive now until you replace the heater coil.

Nov 26, 2009 | 1999 Daewoo Lanos

3 Answers

1990 Pontiac Grand Am 2.5 L engine. Leaking Coolant from fire wall below blower unit from a rubber elbow below a Air conditioner line. Coolant tank had hard crystalized coolant in it. Washed out...


That drain line is for the box that holds the air conditioner evaporator and the heater coil. It seems that your heater coil has sprung a leak and the leaked fluid is coming out the drain. You have to replace the heater coil, which on most cars involves removing a lot of the interior equipment, including the dash board on many cars. A job best left for the repair shop unless you're very adventurous and patient. Even then you will have to take it to a shop to have the air conditioning system recharged.

Jul 06, 2009 | Pontiac Grand Am Cars & Trucks

2 Answers

2003 Dodge 1500 with 4.7L V8 has slight heater coil leak. Is there something I can do to fix without replacing the heater coil that will not hurt the engine?


No you cant.......you have to replace it because the oils in the heater coil will not allow a weld to seal properly......the same thing that happens if you try to weld a condensor unit......if you repair the hole it might hold for a month or so but it always re-opens.....I used industro weld made by JB weld and it held for about 3 months and then the leak came back....after two times of re doing it i finally just replaced it......it just not worth taking it out every three months and re-repairing it.

Jun 13, 2009 | 2004 Dodge Ram 1500

1 Answer

Heater Coil Location


If you have coolant in the passenger compartment the heater core is definitely leaking. Replacement usually requires removal of the entire dash board and gets pretty involved. You might want to have this performed at a repair shop.

Mar 13, 2009 | 1999 GMC Sonoma

4 Answers

Leaking antifreeze from the bottom of car


This is most likely the heater core. You'll see the anti-freeze leak sometimes outside the truck because some heater boxes have a drain tube for this reason. Of course, it could possibly be a loose heater hose connection or a leaking 'diverter or bypass valve'. Most often it is the heater core though. Pay extra attention to your coolant level until it's repaired, so as not to run low on coolant and overheat your engine.

Most heater cores can be replaced with just basic mechanical knowledge and tools. Click here for a step-by-step video of how to go about it. Good luck!

Dec 14, 2008 | 2000 Ford Expedition

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