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64 cj5 heat issues

Discussion in 'Early CJ5 and CJ6 Tech' started by monster, Nov 18, 2014.

  1. Nov 18, 2014
    monster

    monster New Member

    Joined:
    Nov 2, 2014
    Messages:
    9
    You all have been very helpful, i hope you are able to help once again.
    my blower is working both speeds,I have had it apart and it is clean inside.
    the damper valve is fully closed(freshair is blocked).
    the selector for the heat appear to be vacuum operated, not sure though.
    the engine temp is running at 180 degrees
    i have been told that jeeps are known for poor heat ,is this true?
    thanks
     
    monster, Nov 18, 2014
    #1
  2. Nov 18, 2014
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
    Joined:
    Sep 23, 2002
    Messages:
    12,530
    If this is the stock firewall mounted heater, yes, they are less than stellar in stock form. They are commonly referred to "placebo heaters". It's very common for them to be replaced with aftermarket units. Most commonly the "Summit" or "Mojave" heater. I can attest to the effectiveness to the "Summit" heater (so-called because it's sold through Summit Racing).
    Having said all that, I would make sure what you have is working correctly first. Are the mode doors working correctly? Not rusted in place or the vacuum motors inoperative? Check and make sure the controls are operating correctly. They are vacuum operated and commonly a source of problems.
     
    nickmil, Nov 18, 2014
    #2
  3. Nov 18, 2014
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Bozeman, MT
    Joined:
    Jul 18, 2013
    Messages:
    5,714
    I may be mis-interpreting or you may have a different heater (and I could be just plain wrong): what are you calling the 'damper valve'? If its the stock heater on the driver's side firewall (engine compartment side), then the flapper valve in front of the core doesn't really block fresh air intake, it controls the temp adjustment (connected to the temp slider control) by either routing the fresh air through the heater core (hotter) or around the core (cooler). One of the challenges with the stock heater is that it is always taking in fresh air and thus doesn't have a chance to repeatedly heat the same air.

    if I am wrong someone can chime in and correct...

    as Nick said - check the vacuum lines and make sure the controls are working.
     
    FinoCJ, Nov 18, 2014
    #3
  4. Nov 19, 2014
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
    Joined:
    Sep 21, 2002
    Messages:
    12,390
    Without air flow or with limited air flow your heater isn't going to work correctly. I don't have the original heater in my CJ5 so I don't really know how well they work but the original heater in my wagon with the fresh air intake will keep it quite toasty even at 30 degrees outside. The biggest challenge is getting the 6 cyl. flathead engine to warm up to operating temperature.
     
    Glenn, Nov 19, 2014
    #4
  5. Nov 19, 2014
    colojeepguy

    colojeepguy Colorado Springs

    At the foot of...
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    Apr 4, 2010
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    7,209
    I upgraded my stock blower motor to a Chevrolet unit and it made a big improvement. When I get home I can post up the instructions on how to do it.
     
    colojeepguy, Nov 19, 2014
    #5
  6. Nov 19, 2014
    monster

    monster New Member

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    Nov 2, 2014
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    colojeepguy, yes this sounds good, i assume the chevy blower moves more air.?
    I await your details
    thank you
     
    monster, Nov 19, 2014
    #6
  7. Nov 19, 2014
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
    Joined:
    Sep 21, 2002
    Messages:
    12,390
    I assume you have tried it with the fresh air flow open? I didn't really see mention of the results you are having. Do you have a picture of the heater controls?
     
    Glenn, Nov 19, 2014
    #7
  8. Nov 20, 2014
    colojeepguy

    colojeepguy Colorado Springs

    At the foot of...
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    Here's the instructions I followed on the blower motor upgrade. It moves a lot more air, but it is considerably noisier.
    http://home.comcast.net/~sday77/binky/index.htm

    One other thing I've noticed is that you need at least 180 degrees of engine temp to get a decent amount of heat.
     
    colojeepguy, Nov 20, 2014
    #8
  9. Nov 21, 2014
    army grunt

    army grunt Member

    Georga USA
    Joined:
    Feb 21, 2012
    Messages:
    269
    aFTER CHECKING EVERYTHING OUT TO BE SURE ITS LETTING AIR IN AN OUT OK. If its not better , You may be ahead if you pull the heator core an have it "flow" tested..its easy to pull out. Mine heats ok.I had mine boiled out an tested ....
     
    army grunt, Nov 21, 2014
    #9
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