F355 Thermostat Replacement | FerrariChat
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F355 Thermostat Replacement

Discussion in '348/355' started by dwbic, Oct 11, 2015.

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  1. dwbic

    dwbic Rookie

    Jun 19, 2013
    16
    Peru, IL
    Full Name:
    Don
    #1 dwbic, Oct 11, 2015
    Looking for the easiest way to remove the thermostat housing and replace the thermostat - what is the best way, what other components need to be removed, is it easier from above or below? (I have access to a 2post car lift).
     
  2. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    13,586
    San Carlos, CA
    Full Name:
    Mitchell Le
    #2 yelcab, Oct 11, 2015
    Do it from above. It cannot be done from below.

    It much easier with the lid removed (5 mins)

    1. lid
    2. coolant tank shroud
    3. top coolant hose from thermostat housing to radiator cross pipe
    4. T-stat housing

    Reverse process, fill up with new coolant.
     
  3. dwbic

    dwbic Rookie

    Jun 19, 2013
    16
    Peru, IL
    Full Name:
    Don
    #3 dwbic, Oct 11, 2015
    Thanks - I wondered about removing the lid - seems that is what will make the task much easier.
     
  4. taz355

    taz355 F1 Veteran
    Owner Silver Subscribed

    Feb 18, 2008
    6,016
    Indio Ca/ Alberta
    Full Name:
    Grant
    #4 taz355, Oct 12, 2015
    You do. Not need to remove rhe housing to replace the t stat.
     
  5. Gialllo uno

    Gialllo uno Formula Junior

    Jul 5, 2014
    346
    Reisterstown, Maryland
    Full Name:
    Mark
    #5 Gialllo uno, Oct 27, 2015
    I was just about to replace mine also and also wondered about the lid. seemed like it, but wanted to check. Mine definetly seems to run cool after warm up and a constant speed. I just replaced both pre cat O2 sensors, which was a bit of work, not terribly hard with alift, but with big hands.............

    Thanks for all the help, always top notch suggestions from all.
     
  6. dwbic

    dwbic Rookie

    Jun 19, 2013
    16
    Peru, IL
    Full Name:
    Don
    #6 dwbic, Oct 29, 2015
    Based on my 1st go around with replacing the thermostat, I wouldn't do it without removing the lid. I had a bit of a battle removing the old hose - it was stuck on pretty well and stiff - likely the original hose. Then I couldn't get it back on - bought a new hose which was much more flexible and went right on - so you may want to consider a new hose at the same time.

    Also, I didn't realize the throttle cable bracket was anchored with one of the thermostat studs, so the car had too much slack in the cable and lousy throttle response.

    Definitely a learning experience, but the new thermostat is working great, the throttle is adjusted better and all is well.
     

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