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Discussion in 'Electrical' started by JoeJack88, Feb 7, 2007.

  1. JoeJack88

    JoeJack88 Well-Known Member Super Moderator Donated!

    Originally posted by Rick89GTS from 4gcelica.net

    4th Gen Heater QUICK FIX
    STEP 1:
    For a temporary quick fix: undo the piano-wire loop on the heater inlet located on the firewall. Push the lever all the way to the rear for heat.

    NOTE: Forward means to the front of the car.

    STEP 2:

    Slide down by the passenger side left footwell beside the heater. Unclip the white plastic clip that holds the heater vent control arm. Push the lever all the way forward and that will allow heat to enter the cabin. (If you don't unhook this arm, intermittent contact will cause it to default back to the cold position.)

    This quick fix will get you through winter but the long term fix is the soldering repair.
    I've re-soldered 5 HVAC panels already but it ain't that hard, you just need patience.
  2. Rick89GTS

    Rick89GTS Well-Known Member Moderator Donated!

    Addendum - STEP 2:
    Here's how it looks unclipped. It'll shift every once in a while, so check it.
    *Don't lose that little clip. If it falls out, put it in a safe place.

  3. Rick89GTS

    Rick89GTS Well-Known Member Moderator Donated!

    Re: 4th Gen HEATER QUICK FIX


    Cross referenced to this write-up (a must read!):


    Don't forget to check the 'piggyback' board:


    Edit: the info below refers to the Canada and USA LHD 88-89 HVAC panel only - the 86-87 ones are different and I have not diassembled that one yet.
    This last pic is something that's been plaguing us 4th Gen'ers for a long time.
    I believe I've finally identified which leads go to the heat slider bar - they are the No. 1 and No. 10 Pins. If you resolder all the red circled points, it should fix your heat.

    *Note: these are the most common ones that crack, but if you've come this far, check over everything*

    If you try it and it works for you, post feedback :)

    Last edited: Oct 26, 2013
  4. Stig

    Stig ST162 Guru Donated!


    You need a soldering iron with a fine tip
    Just heat up each solder point to re-melt them as some have cracks in them
  5. Stig

    Stig ST162 Guru Donated!

    Also, don't be alarmed if yours looks different - There are L/hand and R/hand versions.
    Each year (apart from 88-89) got different versions of these
    JDM's are totally different with extra functions and different boards

    Very difficult to say what goes where as there's 9? different types out there
  6. peedie

    peedie Guest

    step 1 and 2 checked out ok. The lever and wire for the heat er works fine. So thats not the problem. Maybe the thermostat could be shot?

    I have an 87 3s-ge, European left hand drive.
  7. Stig

    Stig ST162 Guru Donated!

    If the levers are moving that's a good sign

    When last did you flush the radiator & motor? Have you flushed the heater radiator?
  8. peedie

    peedie Guest

    I have just flushed the radiator two times, and out came a lovely rust-red liquid :) it's better now though. But I haven't checked the heater radiator, where is it located? better check my haynes manual
  9. Rick89GTS

    Rick89GTS Well-Known Member Moderator Donated!

    When you do Step 1 & 2, do you get heat coming into the cabin?
    If yes, then the problem is usually cracked solder connections in your HVAC panel.

    The 87 HVAC panel looks different that the one pictured, but if you look for cracks and resolder them, that should fix your problem.

    Here's more info on the Permanent Resolder Fix:
  10. peedie

    peedie Guest

    the wire and levers move as they are supposed to, but still no heat
  11. Rick89GTS

    Rick89GTS Well-Known Member Moderator Donated!

    Just to clarify:
    You left them in the open positions shown above,
    with the car fully warmed up and blower fan turned ON,
    and still no heat?
  12. peedie

    peedie Guest

    I did, but Im gonna check it again with the engine good and warm
  13. Rick89GTS

    Rick89GTS Well-Known Member Moderator Donated!

    If you do what is described above, you should get heat.
    If not, possible causes could be thermostat stuck closed, a blocked radiator and/or coolant/heater hoses.
    Let us know, I'm curious
  14. peedie

    peedie Guest

    btw.. where is the heater radiator located?
  15. Stig

    Stig ST162 Guru Donated!

    Mines in a big white box under the dash, there's two pipes facing the motor.
    You will need to disconnect them and force water through them each a few times.

    As you can see the design is bad in that there's no way for muck to exit and it acts as a mud trap
    This one was so bad I removed it and had it chemically cleaned

    Yeah all 4 of my cars had blocked heater rads, rads and motors - you gotta disconnect ALL the hoses and blow everything out
    Use anti-freeze, it's the best way to prevent this from happening
  16. peedie

    peedie Guest

    Is it a pain to get out of the dash? Might be easier to change the thermostat first...
  17. Stig

    Stig ST162 Guru Donated!

    You'll have to pull the dash someday to fix the leaking flaps

    for now just follow the pipes to where they enter the firewall, pull them off and flush
    the radiator in the dash, you should be flushing the entire motor and radiator as well
  18. peedie

    peedie Guest

    Nice! I'll find the hoe's (pardon the pun), pull them out, shove the waterhose in there and flush it. Should I be afraid of leaks inside the car?
  19. Stig

    Stig ST162 Guru Donated!

    The pipes are on the firewall behind your motor!
    Just follow them from the heater valve, I'd put pics but my RHD is different and I'd hate
    to confuse you more after showing what's inside the dash and why the problem occurs.
  20. peedie

    peedie Guest

    i took the car out for a spin now. Drove about 15 kilometres. When i stopped the radiator upper and lower hose was warm and white smoke came from the radiator. Might have been cause of external water from a puddle though.. I guess ill change the thermostat and waterpump and see what happens

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