2005-2008 Ford Escape and 2006-2008 Mercury Mariner, Hybrid Electric Water Pump Diagnostic Procedure and Replacement

2005-2008 Ford Escape Hybrid and 2006-2008 Mercury Mariner

Overheating condition for Hybrid vehicles. This condition may exhibit a Red Triangle Light (“Stop Safely Light” or “High Motor Temperature“) and/or codes indicating a transaxle over-temperature. Result in reduced power, as the system activates fail safe operation.

Today’s vehicle manufacturers rely more on hybrid technology to meet federal emission standards but this sophisticated technology creates new challenges. Something as elementary as a water pump that once simply cooled the engine, is now also responsible for cooling the massive batteries used in today’s hybrid vehicles. A TechSmart™ hybrid electric water pump offers today’s technician a complete solution for replacing the failed OE water pump that can cause a hybrid vehicle’s battery to overheat.

Hybrid Electric Water Pump Assembly
r19001s Hybrid Electric water pump

Ford has issued a few Technical Service Bulletin, the lastest being 08-24-5, issued on December 8, 2008.
Superseding Bulletin 08-15-1, date of issue August 4, 2008.
Other related reference numbers: 05-23-6, 06-1-1, 06-11-10, 06-13-1, 06-26-11, 07-13-8, 07-23-2, 07-2-8, 08-24-5, 08-3-8, 08-4-16

The codes that may be set P1A0E, P1A0F, POA3C, POPA3E, POA7A, POA7C, and P1A0D.

Before condemning the Motor Electronics Cooling System (“MECS”). Check for engine coolant system loss or base engine overheating concerns, follow normal diagnosis in cases of engine overheating. Once you verify engine cooling systems are correct (fluid levels and no leaks), you are ready to move on to the MECS pump diagnostic procedure.

Is the electric pump running?

If so, verify coolant flow into the MECS reservoir. If there is no flow check to see that you don’t have any hoses that are pinched or twisted.

If pump is not running, tap on housing and listen for pump to turn on. If pump turns on, replace pump.

If tapping on the pump does not turn the pump on, verify the connector has voltage.
If voltage is present double check that the connector is fully seats in pump, before replacing pump.
Connector view of MECS Harness side

The MECS can only be accessed from under the vehicle. The electric pump is located on the core support, below the radiator, near the oil filter.

Hybrid Electric Water Pump

Replacing the electric water pump only requires removing the Splash shield, two hose clamps, two 10mm bolts and one electrical connector.

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About Josh

I help manage the site here at Auto Repair Instructions. If you are having problems, then I am the one to contact.

Posted on July 12, 2011, in Ford, Mercury, Uncategorized, Water Pump. Bookmark the permalink. Leave a comment.

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