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FEH, A/C based battery cooling system to Cabin air based sys

4581 Views 8 Replies 4 Participants Last post by  jgenb
My FEH 2006 has rear a/c problem and doesn't cool down battery. I thought that problem with belnd door. But when I turned off front a/c, rear a/c works well and cooled down battery. I has 3 options to fix
1. Change Compressor because of luck of pressure.
2. Change expantion valve.
3. Change a/c and heater switch.

Which one should i do first to solve issue?

Last night I removed blend door motor, inside panel driver back side and Hose. I also kept belnd doors open. Battery cooled by air form cabin now. It works but i have service light and message. anyone has idea how to convert cooling system from A?C based to Cabin air based?
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"rear a/c works well and cooled down battery"

The first generation Escape Hybrid does not have a dual cabin (front-back) A/C system. I'm not sure what you mean by rear a/c system works well: are you referring to the outside air brought into the hybrid battery thru the split rear driver's side window (blend door opening)?-are you referring to the air conditioning brought into the hybrid battery via the coolant lines you can see on the underside of your vehicle especially near the rear driver's side wheel?- or?

Since your dash is displaying a warning message have you tried to read the "code" via code readers that can be found cheap at Walmart for around $25.00 or so? A scanguage can also read codes and one "X-code" can be inputted to display whether you have a blend door issue.

If I am correct :worry: , the 2010 Escape/Mariner now feature internal cabin cooling to the hybrid battery. There is software involved in this process and it is extremely unlikely you can covert your 2006 to this feature.
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Your description indicates something is not letting the air flow rearward along the coolant lines into the hybrid battery. I don't have enough mechanical knowledge to pinpoint the exact issue but I can share information from my 2005 Helms manual.

This is from section 412-00B-20
When the high voltage battery approaches it upper temperature limite, the Traction Battery Control Module (TBCM) requests batttery cooling from the PCM. The PCM returns a sgnal to the TBCM allowing battery cooling under the proper conditons. The TBCM then monitor the the auxiliary evaporator for a temperature drop. The TBCM sends avoltage signal thru circuit 3703 to the auxiliary evaporator thermistor. The signal is returned thru circuit 3704 to the TCBM. A DTC (code) B2590 would indicate a rear air conditoning system fault. A DTC P0535 would indicate AC evaporator temperature sensor circuit failure. A DTC 2612 would indicate AC refrigerant distribution valve control circuit low. While DTC 2613 would indicate an issue with circuit high.

Somehow you got to get the codes read off of your vehicle.
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The scanguage II can read codes but..some (silent) codes need the Ford equipment to been seen. Can you take you vehicle to an autoparts store and have them use a code reader in an attempt to see what codes exist?
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