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My Heater Mod

Discussion in 'Early CJ5 and CJ6 Tech' started by Jw60, Oct 16, 2018.

  1. Oct 16, 2018
    Jw60

    Jw60 Recovering Jeepaholic

    Sedalia MO.
    Joined:
    Oct 5, 2018
    Messages:
    305
    I have always wondered about the fresh air control knob. The control shuts off the air to the fan when pushed all the way in, at half pull it let's air bypass the heater core, and fully pulled will bringnthe air thru the heater core. The adjacent control will control the fluid flow from the cylinder head for heat and we also have a defrost control. By adding a baffle and cutting a little, I was able to make a cabin air recirculating function instead of allowing air to bypass the heater core. While I had it apart I also replaced the blower motor with a 15amp motor.
    Now be patient, is gonna take a few posts.
    I'm still trying to figure out the forum and pics via a cellphone.
     
  2. Oct 16, 2018
    Jw60

    Jw60 Recovering Jeepaholic

    Sedalia MO.
    Joined:
    Oct 5, 2018
    Messages:
    305
    First step is to remove the housing on the inside of the firewall that the blower motor attaches too. this is the section to the right in this picture.
    [​IMG]

    notice how everything from top and bottom of the heater core enters the same cavity on the cab side.

    Pull the blower motor off and clean the box
    Next we cut 4 holes on the top half of the box. This will take a lot of rigidity away.
    [​IMG]
    I made 4 trim plates to strengthen this area and hold bug netting / foam window ac filter media. I will get the exact hole size asap. There is like 16in2 of area that needs removed to maintain as much airflow as possible thru the system and too big a hole will interfere with the new baffle.
     
    Last edited: Oct 19, 2018
    Hellion likes this.
  3. Oct 17, 2018
    Bowbender

    Bowbender I'm workin' on it! Sponsor

    Northern Minn.
    Joined:
    Nov 14, 2014
    Messages:
    559
    Beaming Pics....;)
     
    Focker likes this.
  4. Oct 17, 2018
    Jw60

    Jw60 Recovering Jeepaholic

    Sedalia MO.
    Joined:
    Oct 5, 2018
    Messages:
    305
    Last edited: Oct 19, 2018
  5. Oct 19, 2018
    Jw60

    Jw60 Recovering Jeepaholic

    Sedalia MO.
    Joined:
    Oct 5, 2018
    Messages:
    305
    this picture is with everything back in place. you can see the recirculating cabin air enters thru the bug screen. then it goes thru the top half of the duct to the air control baffle.
    then thru the heater core and back thru the bottom half of the duct into the blower.
    the blower motor is from a late 80s/ early 90s gm van with the brushes reversed.
    [​IMG]
     
    Bowbender and Hellion like this.

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