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How To Install Fox Body Heater Hose & Fitting Kit | 79-85 Mustang

Last Updated 6/29/2020 by Taylor Ward

Check out LMR's article on how to install your 1979-85 Fox Body Mustang Heater Hose & Fitting Kit from 5.0 Resto! Replace your dry rotted heater hose today!

Viewing this install and using the information shared is subject to the terms set forth here - View the LMR Install Instructions Disclaimer.

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How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang

Before getting started with the install we wanted to point out that Ford did a lot of changing during this time. Early cars had an adapter to adapt the smaller heater return hose to a larger hose on the factory water pump. If you have installed an aftermarket water pump you will not see this larger hose. Also, cars that are equipped with CFI (central fuel injection) utilize a 90-degree fitting that has a temp sensor located at the top. This fitting can either be removed, cleaned, then reinstalled or simply leave it as is.



Install


  1. Disconnect the negative battery cable.
  2. How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang


  3. Support the vehicle on a lift or jack stands.
  4. How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang


  5. Place a drain pan or bucket underneath the fitting on the radiator.
  6. How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang


  7. Open the fitting and drain some of the coolant from the system. (Since we are only replacing heater hoses, you don’t have to drain all of the coolant)
  8. How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang


  9. Remove the air cleaner, vacuum lines, and any other related part to these particular components.
  10. How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang


  11. Remove the distributor cap and unplug the coil. Position the cap out of the way.
  12. How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang


  13. Remove the vacuum hose that connects to the distributor if applicable.
  14. How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang


  15. Unscrew the hose clamp at the 90-degree fitting at the lower intake and then remove the hose from the fitting.
  16. How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang


  17. Position the upper radiator hose out of the way and remove the 90-degree fitting using a 7/8 open end wrench.
  18. How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang


  19. Depending on your vehicle you may need to remove or reposition your ignition coil to install the new 90-degree fitting.
  20. How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang


  21. You can do this by disconnecting the electrical connections to the coil and then a 9/16 socket to remove the hold down bolt.
  22. How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang


  23. Apply some teflon tape or high temp thread sealer with PTFE to the threads on the new fitting.
  24. How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang


  25. Inspect and clean the threads on the lower intake.
  26. How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang


  27. Then you can reinstall the fitting into the lower intake using a 5/16 open end wrench.
  28. How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang


  29. For better access to the return hose remove the serpentine belt and the upper radiator hose.
  30. How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang

    How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang

    How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang


  31. Disconnect the electrical connections to the alternator. The connections could differ depending on the year of the vehicle.
  32. How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang

    How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang


  33. Loosen and remove the (2) bolts that secure the alternator to the bracket. The upper bolt is 9/16 and lower is 5/8.
  34. How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang


  35. Loosen the hose clamp and remove the heater hose going to the water pump return.
  36. How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang


  37. Loosen the hose clamps with the heater core and remove the (2) hoses from the heater core. As remove these hoses be careful not to spill any fluid that could still be inside any of the hoses.
  38. How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang


  39. Preinstall one of the hose clamps onto the ¾ supply hose to make installation a little easier.
  40. How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang


  41. Install the flow restrictor into this hose with the tapered end facing toward the front of the car.
  42. How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang


  43. When you install this hose onto the heater core it will push the flow restrictor the rest of the way in. Go ahead and snug down the clamp.
  44. How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang


  45. Depending on your application you can determine how you would route the hose to the 90 degree fitting in the lower intake. For our application, we routed the hose the same way as the one we removed. Whenever this is determined you can cut the hose to length.
  46. How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang


  47. Install a hose clamp and slide the hose onto the 90 degree fitting and tighten down the clamp. Depending on the orientation of the fitting it may need to be clocked to make it face in the right direction.
  48. How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang


  49. For the 5/8 return hose, we decided to run it alongside our supply hose. This hose runs underneath our alternator to the water pump return.
  50. How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang


  51. Connect one end of the hose to the heater core with the hose clamp preinstalled.
  52. How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang


  53. At the water pump, determine the desired length making sure there are no kinks in the hose and cut.
  54. How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang


  55. Install a hose clamp and slide the hose onto the water pump and snug down the clamp.
  56. How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang


  57. Double check all of your work.
  58. How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang


  59. Reinstall the alternator and reconnect the electrical connections.
  60. How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang


  61. Reinstall the serpentine belt.
  62. How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang


  63. Reinstall the coil and distributor cap along with the coil wire.
  64. How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang


  65. Reinstall your air cleaner and its associated components.
  66. How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang


  67. Top off the coolant.
  68. How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang


  69. Reconnect the negative battery cable.
  70. How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang


  71. Get the car on the ground and you’re good to go!
  72. How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang - How To Install Fox Body Heater Hose & Fitting Kit | 1979-85 Mustang

Heater Hose & Fitting Kit


About the Video

How To Install Fox Body Mustang Heater Hose & Fitting Kit (79-85)

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Published on 2020-06-17
5.0 Resto Heater Hose and Fitting Kit: https://latemodelres.to/18472B-K

Mustang 5.0L Heater Hose and Fitting Kit
Replace the dry rotted heater hoses on your Fox Body with this 1979-1985 Mustang heater hose kit from 5.0 Resto! One of the most common sources of coolant leaks is your Mustang's heater hoses and heater hose fitting. These hoses allow coolant to enter and leave the heater core to heat the interior of your Fox Body. Over time these hoses and fitting can get hard, brittle, rust and can crack or break. Included in this kit are two 4-foot cut-to-fit replacement heater supply and heater return hoses, 4 hose clamps, heater core flow restrictor, and the 90° fitting that screws into your intake manifold just behind the thermostat housing.

Installation Note
Hoses must be cut to the correct length for your application.
Heater core flow restrictor is to be installed in the 3/4" hose end closest to the intake manifold fitting. This is to prevent over-pressurization in the hose and heater core.

Application
Fits 1979-1985 Mustang 5.0

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