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Thread: A/C died on me

  1. #1
    I post a lot... porschpow's Avatar
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    Default A/C died on me

    I was on the way home in my '97 Lincoln Town Car and of course with a load or refrigerated groceries and a hot day, my A/C (which worked halfway home) crapped out.

    The Cold air that came out phased out and cool/warm air phased in. I tried to do the EATC test and no codes came up, but I still reset it. And when turned the AC on, the clutch did not kick in. And I switched relays for the A/C cutoff and still no dice.

    Two things I would like to bring up here (whether it may contribute to the problem:

    1) For the longest time every time I turned on the HVAC (whether it be auto, A/C, heat) I would hear a sound that sounded like a clicking grinding sound that would go away in a second or two. I would assume that is the compressor (which I kind of new perhaps the compressor was on its way out)

    2) The day or two before the A/C crapped out every time the A/C was on (or auto setting) I smelled a weird chemical smell. As best I can put it, it smells like new car smell and burning electronic. I thought it was the smells outside.

    Anybody has any ideas, sure would appreciate it.
    "To Find yourself, you must first lose yourself"

    -1973 Volkswagen Bus Westy
    -1986 Honda Magna 700cc
    -1989 Lincoln Town car Signature Series
    -2011 Subaru Outback

  2. #2
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    Bypass the low pressure cutoff switch. Can't leave it that way.

    If the compressor runs it narrows down the issues.
    "X" car 89 Colony Park LS Mods>Engine delete, SS duals magnaflow hflow cats, 2010 Must GT mufflers, auto air shocks, Posi, Tran cooler, big front brakes, 03+ rear disks, Large 3g alt, Tripminder, GS grill, 86 seats, 16" HPP wheels, winter boots=96 Cartier wheels, 215-65/16 Goodyear ULTRA GW3 snows, pi rear sway, alum driveshaft.
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  3. #3
    Road Warrior Kodachrome Wolf's Avatar
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    I remember when my Ď97 went out, I got a refrigerant smell and then I had fast cycling of the clutch. Figured the system was low and added some of that A/C Pro, then realized the clutch wasnít cycling normally after that, it stayed on and sounded freaky at 2K. Air still got cold, but the compressor sounded like crap.

    Had it checked, compressor internals decided to let go. Replaced compressor, orifice tube, and accumulator. Flushed evaporator and condenser. Then had the system vacuumed down and itís been good since.

    Iíd verify line pressure and see if the system didnít decide to vent itself.

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  4. #4
    I post a lot... porschpow's Avatar
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    Quote Originally Posted by jaywish View Post
    Bypass the low pressure cutoff switch. Can't leave it that way.

    If the compressor runs it narrows down the issues.
    How would you bypass the low cutoff switch?
    And obviously it the compressor runs with that done, than its not the compressor
    "To Find yourself, you must first lose yourself"

    -1973 Volkswagen Bus Westy
    -1986 Honda Magna 700cc
    -1989 Lincoln Town car Signature Series
    -2011 Subaru Outback

  5. #5
    The Brown Blob 87gtVIC's Avatar
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    You pull it’s plug and short the wires with a paper clip.
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  6. #6
    Beater gonna beat sly's Avatar
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    But only for a quick check. Watch the compressor while you do this and just let it spin for a second.

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  7. #7
    I'm an air-conditioned gypsy gadget73's Avatar
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    If the compressor runs with the pressure switch bypassed, it only means the pressure switch is making it not run. It does not mean that the switch is bad, it could mean you have no refrigerant. Do not do this without making sure there is a charge in the system.

    I said this elsewhere, but verify you have power to that switch first. Losing voltage into the switch might mean the EATC unit is the problem. It happens on this era. Usually can be fixed by re-soldering some connections but diagnose it first. A test light is more useful here than a voltmeter.

    86 Lincoln Town Car (Galactica).
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  8. #8
    I post a lot... porschpow's Avatar
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    Do you just put the metal probes into the harness contacts?
    "To Find yourself, you must first lose yourself"

    -1973 Volkswagen Bus Westy
    -1986 Honda Magna 700cc
    -1989 Lincoln Town car Signature Series
    -2011 Subaru Outback

  9. #9
    I'm an air-conditioned gypsy gadget73's Avatar
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    unplug the connector and probe into that. If your probes are larger than the contacts in the connector, use some smaller gauge wire or paperclips to poke in there. Don't pierce the wires.

    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    91 Lincoln Mark VII LSC SE, triple black (Timewarp) - poly front bushings, KYB struts and shocks, Holley SystemMax1 lower intake, SilverFox AOD valve body,

    1984 Lincoln Continental TurboDiesel - rolls coal

    Quote Originally Posted by phayzer5 View Post
    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

  10. #10
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    Just some amplification to Gadget. If you are checking for voltage and using a meter the hot probe goes into harness contacts neg probe to battery terminal or other known good ground. If using a test light doesn't matter which wire goes where. One contact should be hot with car on and ac switched on.

    Also iirc engine does not need to be running to bypass switch. Just ignition in on position with AC on. The clutch should engage.
    "X" car 89 Colony Park LS Mods>Engine delete, SS duals magnaflow hflow cats, 2010 Must GT mufflers, auto air shocks, Posi, Tran cooler, big front brakes, 03+ rear disks, Large 3g alt, Tripminder, GS grill, 86 seats, 16" HPP wheels, winter boots=96 Cartier wheels, 215-65/16 Goodyear ULTRA GW3 snows, pi rear sway, alum driveshaft.
    03 Marauder DBP, HS, 6disk, Organizer, Silver Stars, M&Z rear control arms, Oil deflector.
    02 SL500 Silver Arrow
    08 TC Signature Limited, HID's Mods>235/55-17 Z rated Cooper Zeon RS3-A, Addco 1" rear Sway, Posi, Compustar Remote Start, floor liners, trunk organizer, Winter=05 Mustang GT rims, Nokian Hakkapeliitta R-2 235/55-17

  11. #11
    I'm an air-conditioned gypsy gadget73's Avatar
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    Engine not running might have the WOT relay engaged so the compressor isn't spinning on the starter. Not honestly sure there. A test light is probably the better tool for this. You need to verify the circuit can handle some current, and meters just don't put enough load on to always tell the tale. Mine is a lamp socket with one of those wedge base bulbs in it. Nothing fancy, just some junk I had laying around.

    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    91 Lincoln Mark VII LSC SE, triple black (Timewarp) - poly front bushings, KYB struts and shocks, Holley SystemMax1 lower intake, SilverFox AOD valve body,

    1984 Lincoln Continental TurboDiesel - rolls coal

    Quote Originally Posted by phayzer5 View Post
    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

  12. #12
    Fastest Box In South Jersey 86VickyLX's Avatar
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    Bring it to me for diag. Before you burn the car down

  13. #13
    I'm an air-conditioned gypsy gadget73's Avatar
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    I can bring some dirty diesel fuel to help with that. I'm sure I have some from the last fuel filter change I did.

    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    91 Lincoln Mark VII LSC SE, triple black (Timewarp) - poly front bushings, KYB struts and shocks, Holley SystemMax1 lower intake, SilverFox AOD valve body,

    1984 Lincoln Continental TurboDiesel - rolls coal

    Quote Originally Posted by phayzer5 View Post
    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

  14. #14
    I post a lot... porschpow's Avatar
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    Gadget,

    with the key turned onto the accessory position (car not running), i unplugged the wire harness on top of the compressor to test for voltage, but realized the probes might be too big. Like you said, I will have to use smaller gauge wiring to get in there
    "To Find yourself, you must first lose yourself"

    -1973 Volkswagen Bus Westy
    -1986 Honda Magna 700cc
    -1989 Lincoln Town car Signature Series
    -2011 Subaru Outback

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