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Mr. Cool

Mercruiser 864395T 4.3L. 5.0L, 5.7L & 6.2L Heat Exchanger (No Hose) Replacement

Mercruiser 864395T 4.3L. 5.0L, 5.7L & 6.2L  Heat Exchanger (No Hose) Replacement

Replaces Mercruiser part no. 864395T

Used on Mercruiser engine:

Various GM 4.3L, 5.0L, 5.7L & 6.2L engines.

*NOTE: There are two configurations. One with hose (864395T01) and one without (this one). See second photo for comparison. The hose sometimes gets in the way of the belt and pulleys. Click here for the version with hose.

As far as function:

  • WITH HOSE:  the hose drains a full surge tank into the inbound glycol circuit to the recirculating pump.   
    • There was an engineering change at Mercruiser a while back to add a hose that runs from the surge tank to the glycol / Fresh Water return fitting and it works great.  We think the hose may have been removed as part of a cost save.
  • WITHOUT HOSE: the glycol is drained from the surge tank (the upper tank in the pictures) via drains under the surge tank that you can't see

    This is a non OEM part MEC 864395T

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