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Thread: Coolant CEL lights up at highway speeds

  1. #1
    Join Date
    Oct 2016
    Location
    NYC
    Posts
    60
    My Cars
    E83 LCI 3.0si

    Coolant CEL lights up at highway speeds

    Hey all!

    There's been a strange issue lately. At highway speeds (excess of 50mph, more often at 70+) When going uphill, the coolant CEL comes on. It seems to go away when going downhill. I opened the cap, both warm and cold, coolant is at the right level. It doesn't smell funny. Some vapor exists when opening the cap when warm, which I theorize is normal. I am unsure what's going on here.

    I switch gears between 2,500 and 3,250 rpm and almost never redline her. That is, of course, unless some prick in a Subaru tries to cut me off, that's when the throttle hits the floor. Those are rare instances, though.

    I am at 136k and have pampered her accordingly. Nothing else is coming up via OBDII. I went through the triangle of death, replaced the servo gear, and came away unscathed a few weeks ago. New manifold cover w/ gasket, new oil cooler gasket, new oil filter housing gasket.

    Is it time for a flush?

  2. #2
    Join Date
    Oct 2016
    Location
    NYC
    Posts
    60
    My Cars
    E83 LCI 3.0si
    If anyone is having the same issue, replace your expansion tank. Problem solved. The coolant level sensor gets sticky after 11 yrs of operation.

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