Jim's MK2 Air Conditioning FAQ - Page 4

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  1. #31
    CelicaSupra.com Member
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    Great write up that will be helping people for years to come.

    I was wondering if you could go into more detail about o ring replacements. Maybe as far as where and how many of each size is required? AZ sells a small assortment for about 5 bucks.
    Demoted to rank of Driveway Grass Killer First Class:
    1985 Toyota Celica/Supra 5M-GE 5spd 270,000 miles and ticking( no really the engine is ticking)

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  3. #32
    CelicaSupra.com Member ddd228's Avatar
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    Quote Originally Posted by jdk_ii View Post
    The MK2 is an R12 system.

    Standard issue AC system with a few perks.

    The AC system is automatic. Using a few temp sensors (one inside the center console),
    the AC system auto-magically tries to adjust it self to the selected temperature.
    It's terribly complicated by looking at the electrical schematic. Well, it was the 80's....

    It does have one nice mechanial benefit. It's externally regulated, and adjustable. This by the EPR valve.
    The thing on the passenger's strut tower with a thin hard line connected to it.

    This external regulation actually prevent evaporator freezing via pressure sensing.
    Many newer cars have themal sensor on the evaporator to shut off the compressor when evaporator freezing is detected.

    It does have some extra adjustment features, which use are in the TSRM.

    The compressor is a 10P15C, which is designed for R12. Very common, even on non-Toyotas.
    The important note is that it's the model. They came in different configurations (like ear mount, etc).
    So any 10P15C is not interchangeable with the MK2.

    And lastly, the vent CFM is average. One reason is the opening at the blower case for recirculate is rather small.
    That's why when you turn it to "fresh" you get a bit more CFM.

    The blower motor could use some more RPM, to make it more American car wind tunnel like.
    What about a BETTER blower motor? Why can't i use an R/C brushless motor designed for 12 volts(3S LIPO) and REALLY make some good CFM? What size is the shaft and the length of the motor? I guess I'll need a used blower motor to see if I can make it work.The Chinese brushless motors are CHEAP! 6-8 mm shaft? I wonder what the RPM limit of the cage is.6,000 RPM?
    I may have to find a metal cage to reduce the chance of explosion.I don't have to by pass the resistor block, but I need to wire in a brushless speed control to the motor,indeed. What do you think,during this A/C season?
    Last edited by ddd228; 08-12-2011 at 02:07 AM. Reason: TYPO.

  4. #33
    CelicaSupra.com Member
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    This makes me mad I disconnected my OEM system when I swapped out my 5M.

    It was R12 and still blew cold air.

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  6. #34
    CelicaSupra.com Member ddd228's Avatar
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    Quote Originally Posted by Master_Spazez View Post
    This makes me mad I disconnected my OEM system when I swapped out my 5M.

    It was R12 and still blew cold air.
    Well you HAD to or you forgot how hot summer time can be.I made a large sun shade for the hatch on my '84 -Big difference and I still use my A/C in Seattle,sometimes.Mid August? You bet.

  7. #35
    CelicaSupra.com Member Tire Shredder's Avatar
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    Quote Originally Posted by Master_Spazez View Post
    This makes me mad I disconnected my OEM system when I swapped out my 5M.

    It was R12 and still blew cold air.
    so get this kit! it replaces almost everything
    Black 7M-GE 84 P-type Hardtop
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  8. #36
    CelicaSupra.com Member ddd228's Avatar
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    This thread is gonna get "HOT",soon.
    I think I need a compressor clutch for my '84.
    i really don't want to pull it out to replace it.$200 for evacuation and re charge.
    Maybe possible to change clutch while still in the car?
    i can pull the radiator.
    Dave in Seattle. I keep LATE hours.Hidden Content
    '84 type "L" ,Auto ,daily driver. Dk blue.

  9. #37
    CelicaSupra.com Member ddd228's Avatar
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    My clutch does engage. The A/C light does not go on when button is pushed.
    Is the A/C relay on the passenger kick panel accessed through the glove box? There is a re set hole in it.
    Maybe a bad switch at the on off button...

    Dave in Seattle. I keep LATE hours.Hidden Content
    '84 type "L" ,Auto ,daily driver. Dk blue.

  10. #38
    CelicaSupra.com Member ddd228's Avatar
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    Quote Originally Posted by ddd228 View Post
    My clutch does engage. The A/C light does not go on when button is pushed.
    Is the A/C relay on the passenger kick panel accessed through the glove box? There is a re set hole in it.
    Maybe a bad switch at the on off button...

    NOPE! There is a 10 A. fuse(inside a tiny blue box) on passenger kick panel on my '84.
    Easier to get to if glove box is removed.
    The "condenser fan relay" was not at fault.
    Dave in Seattle. I keep LATE hours.Hidden Content
    '84 type "L" ,Auto ,daily driver. Dk blue.

  11. #39
    CelicaSupra.com Member ddd228's Avatar
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    SEE THIS?http://i514.photobucket.com/albums/t...DSCF0007-3.jpg
    On my '84 the blue box has a fuse that runs the A/C.
    See the square thing with the hole in the top?To the left of the black square one.
    That is a C/B that controls the heater fan.A tooth pick slid into that small hole re sets the heater fan.Goes in 1/4 " and it will click.There is no fuse for the blower motor on an '84.
    I overcharged the R-12 and it caused the compressor to overload the electrics system.the clutch was SMOKING!
    The high side was about 200 PSI,then.
    I will still see where I can rig up a 12 V. blower motor to the existing system of ducts to increase AIR out put.
    The stock duct system is too restrictive/small.
    The right side dash is already apart.Glove box,lower panel and right kick panel is out of the way.

    Try this: http://i514.photobucket.com/albums/t...DSCF0007-3.jpg
    If link is toast see Post # 1744 in WHAT did you do to your Supra today for photo.
    (Jack ass fuse).
    Dave in Seattle. I keep LATE hours.Hidden Content
    '84 type "L" ,Auto ,daily driver. Dk blue.

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