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"Placebo" heater upgrade

Discussion in 'Early CJ-5 and CJ-6 Tech' started by colojeepguy, Dec 27, 2011.

  1. Jan 15, 2012
    MitsJ54

    MitsJ54 New Member

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    Have you checked to see if your original core is plugged up? This is a common issue and will result in only limited warm air. Remove the hoses and hold a garden hose by hand over one hose. There should be a full flow with very little restriction coming through the other hose.
     
  2. Jan 16, 2012
    colojeepguy

    colojeepguy Colorado Springs Sponsor 2019 Sponsor

    At the foot of...
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    UPDATE-
    Last weekend I did the Chevy blower motor upgrade, this weekend I put a 195 thermostat in it. I would say results are mixed. The blower motor works great-much more airflow than the stock unit. However, even with the hotter thermostat, the air temp is just not that hot (both heater hoses are hot so I think the flow is OK). But, I have achieved what I was looking for-it's a noticable improvement for little investment.
     
  3. Jan 16, 2012
    MitsJ54

    MitsJ54 New Member

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    It is very difficult to Identify a plugged core by feeling hose temp.
     
  4. Jan 16, 2012
    aallison

    aallison 74 cj6, 76 cj5. Has anyone seen my screwdriver?

    Green Cove...
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    For the amount of time it takes to pull a couple hoses, I'll pull both and back flush the core....
     
  5. Jan 16, 2012
    chuck123wapati

    chuck123wapati Member

    wyoming
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    dirty fins will effect the output also they are essential for good heat transfer
     
  6. Jan 17, 2012
    colojeepguy

    colojeepguy Colorado Springs Sponsor 2019 Sponsor

    At the foot of...
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    UPDATE (again)
    I think the 195 t-stat I got is defective-I drove the Jeep to work yesterday, and the engine temp was all over the place. I have an Auto Meter temp gauge, and I could watch the temp swinging between 180 and 210. Looks like I'll have to re-do that job :mad:
    Oh, well-if I have to drain the cooling system again, I'll flush the heater core just to be sure.
     
  7. Jan 17, 2012
    PeteL

    PeteL Member Sponsor 2019 Sponsor

    Hills of NH
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    "I think the 195 t-stat I got is defective-I drove the Jeep to work yesterday, and the engine temp was all over the place."


    From page one of this thread...

    ["I might throw a 195 stat in it & see what happens"]

    "Your milage may vary, but the 195 thermostat didn't work when I tried it for the same reason,years ago.
    Here in NH, the engine would boil over in severe cold weather, oddly enough.
    I believe the thermostat was not opening, since it was relatively exposed to the cold air stream and never got up to temp."
     
  8. Jan 17, 2012
    Vanguard

    Vanguard Chief Cook and Bottlewasher Staff Member Sponsor

    Brighton, MI USA
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    Just an FYI. You can use some Ford Blower motors in place of the Blazer motor and can skip having to cut the spacer.
     
  9. Jan 17, 2012
    Smokeater

    Smokeater Sponsor Sponsor

    Browns Summit, NC
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    Joel, Joel, Joel...just when this thread was going so good, you had to use the 4 letter word! J/k! It would be nice to know how to do this mod with even less trouble.
     
  10. Jan 18, 2012
    jburson

    jburson New Member

    Lufkin
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    Oct 5, 2010
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    Which application would this ford blower motor be?

    I bought both PM102 and PM105 for the blazer application (part's house was closing and I had shop time for the night from the very pregnant wife), built a spacer, ran upgraded power for 20 amp, re-clocked and installed PM102, but the fan cage rubs on the motor case at times... my next step will be to pull it back apart and tack weld a small bead on the motor shaft to keep the cage off of the motor's case.

    Also my toes hang up on the spacer at times when I press the clutch, so I would like to get rid of the spacer and get back to the stock look.
     
  11. Jan 23, 2012
    colojeepguy

    colojeepguy Colorado Springs Sponsor 2019 Sponsor

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    Update (again)
    I took out the 195 stat yesterday, and tested it in a pot of boiling water. Now, water boils at around 200 degrees at my elevation, but I had it at a rolling boil for 3 minutes and it had barely cracked open-seems like a defective tstat (sigh). I'm tired of messing with it, so I just stuck the 180 back in & I'll run the "farmer thermostat" (cardboard in front of radiator).
    While I had the system drained I flushed out the core-it has good flow so no worries there.
     
  12. Jan 23, 2012
    jwjeep60

    jwjeep60 in process

    Sedalia Mo.
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    when looking for fuel economy it was suggested to use the HD style thermostat, used in heavy trucks. i wish i had the PN but it was much better than the stock at controlling temp, I had a temp gauge just below the t-stat on the head, it would fluctuate +/- 5* on the highway each time it opened but the stock gauge on the rear of the block would not fluctuate.
     
  13. Jun 12, 2019
    Rick Whitson

    Rick Whitson Detroit Area Sponsor 2019 Sponsor

    I live South of...
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    Honestly, the best bet is to make it air tight, my jeep is comfortable with the stock heater. I don't need a lot of heat, I have winter cloths on to start with, so if you keep the heat you have inside it is not that bad. I built a CJ 5 because it is the first one with heater and defrosters. Just my two cents.
     
  14. Jun 12, 2019
    70cj5134f

    70cj5134f Member

    East Tn
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    Getting rid of the cold air suction side, and somehow route it to pickup air inside the jeep.
     
  15. Jun 12, 2019
    45es

    45es Member Sponsor 2019 Sponsor

    Naches, WA
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    Look at what jeep2003 did to his heater. His modification does reroute the airflow to pickup air inside the jeep.

    Make Your Stock Heater Work
     
  16. Jun 12, 2019
    Jw60

    Jw60 Recovering Jeepaholic

    Sedalia MO.
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    Here is my write up to make the fresh air door recirculate.

    My Heater Mod
     
  17. Oct 9, 2019
    65CJ5 SRD

    65CJ5 SRD Member

    NM
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    Aug 12, 2019
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    Yes, it's MUCH better! Link has changed though: Heater Motor
     
    colojeepguy likes this.

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