Results 1 to 4 of 4
  1. #1

    Polaris MSX 150 Overheats

    I just picked up a 2004 MSX 150 with only 20hrs on the clock. When idling for 3 to 5 minutes the internal cooling circuit overheats to 200 + degrees (using a thermo reader) I replaced the thermostat; no help. The freshwater circuit works fine; exhaust cools great, lots of water flow. The internal cooling circuit acts like it might be airlocked but anti-freeze flows to the ET tank from the return hose when light pressure is applied at the tank. Runs fine except of course it goes into limp mode when the overheat icon appears and the red light blinks. Any suggestions would be most appreciated.

  2. #2
    Kosh's Avatar
    Join Date
    Sep 2007

    Are we talking when you are on the water or trailer?

    If on water problem;
    Iidle (and above) take the cap of the coolant bottle and check you have a nice strong flow coming back into the bottle from the bleed line. If not suspect water pump impeller failure.
    Do this when cool, dont want to unscrew the lid when hot.

  3. #3
    Take the cap off the coolant closed system bottle and check for flow into bottle from the line coming from the pump at idel. If starting out of water make sure you have it in reverse or engine will rev up on its own. If no water the pump gears may be broken.

  4. #4
    It does not have a good flow running into the bottle; just sputs in when hot. And, it happens with the fush attached or in the water. It does act like no coolant flowing thru the water pump or an airlock.... Can't seem to pin it down, I was just assuming with such low hours that the water pump was fine but maybe not.
    Thanks for the input.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. polaris msx 150 burning oil limeted rpm help plz
    By ln69bt in forum MSX/Matrix
    Replies: 22
    Last Post: 04-09-2008, 10:54 AM
  2. 2004 Polaris msx 150 plugs turned silver after ten minutes help
    By Joe dana in forum Polaris Open Discussion
    Replies: 2
    Last Post: 07-16-2007, 11:51 PM
  3. Polaris MSX 150 oil
    By Cobralyn in forum Polaris Open Discussion
    Replies: 1
    Last Post: 05-03-2007, 11:24 AM
  4. polaris msx 150 overboost prob
    By ln69bt in forum Polaris Open Discussion
    Replies: 19
    Last Post: 04-24-2007, 03:19 AM
  5. MSX 150 Overheat alarm ??
    By canuck in forum Polaris PWC Performance
    Replies: 4
    Last Post: 09-30-2006, 07:26 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts