328 AC troubleshooting? | FerrariChat

328 AC troubleshooting?

Discussion in '308/328' started by Fiat4Fun, Jun 14, 2010.

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  1. Fiat4Fun

    Fiat4Fun Formula Junior

    Jul 1, 2008
    317
    Sunriver OR
    Full Name:
    Bob
    Howdy,
    Had a great time with my 328 on Sunday, drove it up to the lakes and it was about 80 outside, just a perfect day, and the weather here in the Northwest has been bad, so I was need for a drive ( or the car was in need....). The car ran PERFECT..

    So a bit of history, last year when I had my belts done at the dealer, I had them check the charge on the ac and look for leaks, and they said it was fine, recharged it with R12, but the AC still did not work.... They said it was electrical.

    Last November, I contact Steve Magnusson via this web site, as he gave some other FC member some assistance, so I ask him for some input on my car. Of course the weather went bad, and AC was low on the priority list!

    Steve, and all you other Ferrari mechanics that help us out ..... Boy you are the best, your experience and your kindness to share with us is greatly appreciated.......

    Now the weather is nice, so I am going through the steps that Steve pointed out, and thought it might help others, and maybe get to the bottom of my problem with my AC.

    Here is where I am at:
    The steps that Steve gave me:


    1. Try a different ...113 relay for relay P.
    - Switch it, and still nothing-

    2. Remove the "w" connector (on the LH side of the fuse-relay panel) and inspect the second connector down from the top for thermal damage (it should have a large MN brown/black wire attached). If OK, plug it back in for the next tests (and, if fried -- repair it ). Turn the key "on", and measure the voltage on the MN wire relative to ground = should be +12V

    - OK, I may of done this wrong, I found a W type connector that feeds the blower, and had a brown/blackwire attached, and the voltage was 12V between ground and the wire. Not sure if I had the right connector.....-

    3. If you pass test #2, remove relay 75c and measure the voltage from the female terminal 30 in the socket (it should have two VR green/red wires attached) to ground with the key "on" = should be +12V. This tests all of the upstream power components (fuse #17, relay P, connections) and the continuity of the blower motor itself (brushes, commutator, winding).

    - OK, checked it out and voltage is 12V at terminal 30-

    4. If you pass test #3 (and with relay 75c still removed), measure the voltage from the female terminal 30 in the socket (should have two VR green/red wires attached) to female terminal 87 with the key "on" = should also be +12V. (There are two terminal 87 positions in the socket, but use the one that has a metal terminal in it.) This tests if terminal 87 has a good ground connection.

    -OK, checked it out and voltage is 12V at between terminal 30 and 87-

    5. If you pass tests 3 and 4, touch a jumper wire from female terminal 30 in the socket to female terminal 87 in the socket = the AC blower fan should run full speed.

    - OK, put a jumper wire in between terminal 30 and 87, and fans run-

    So, I either missed the 'W' connector or need to move onto the next step.

    Let's see where we go from here......

    Thanks so much.
    Bob
     

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