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A/C cooling is weak and gradually loses performance

Q: What are the symptoms of A/C cooling is weak and gradually loses performance in Ford MONDEO IV (BA7)?

No cold air from vents. Problem visible at standstill or in traffic. Problem appears while driving. Different temperature on both sides of the cabin

Q: How to fix A/C cooling is weak and gradually loses performance in Ford MONDEO IV (BA7)?

No cooling and no actuation of the air conditioning compressor clutch with a mechanically functional compressor and a full gas system. In the Mondeo model, the problem manifested itself, among others, in: cooling that only operates at speeds above 40 miles per hour. Solution: The problem was with the power circuits in the fuse box under the hood (the so-called Battery Junction Box). After diagnosis (often burned contacts), the repair consisted of replacing the blown compressor clutch fuse (e.g. F27 for Focus, F30 for Fiesta) and the stuck or burnt relay (e.g. R11 for Focus). Replacing these components restores full cooling power.

in Ford MONDEO IV (BA7) (2012-2018)

Symptoms

No cold air from vents
Problem visible at standstill or in traffic
Problem appears while driving
Different temperature on both sides of the cabin

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Technical diagnosis (Premium)

Recognized technical fault:

Auxiliary controller voltage instability detected

Technical analysis

Detailed analysis of HVAC controller operation parameters, CAN bus data readings, and diagnostic signal waveforms. Purchase PRO access or log in to read the full fault analysis.

Confirmed solution

Complete step-by-step repair procedure including module non-volatile memory reset, sensor calibration, and correct wiring routing. Unlock the full report to see the instruction.

Parts needed

Filters ferrite anti-interference / noise suppressor
Auxiliary starting battery (depending on cell status)

Workshop hacks

Important workshop tips for mechanics regarding bypasses without expensive control module replacement and manufacturer software service bulletins.

TSB / TPI service bulletins

TSB-24-HVAC-01TPI-2068943/2

A/C Technical Specifications

Refrigerant: R1234yf Amount (g): 570g Oil: WSS-M2C300-A2 PAO 68 AA1 lub PAG ISO 46 YF Oil (ml): 150ml

V - (CNG)

Refrigerant: R134a Amount (g): 550-600g Oil: PAG 46 Oil (ml): 130 - 160ml

V 1,0 i EcoBoost

Refrigerant: R134a Amount (g): 530g Oil: WSH-M1C231-B PAO 68 lub PAG ISO 46 Oil (ml): 145ml

See full specification

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A/C cooling is weak and gradually loses performance

Symptoms

A/C Technical Specifications

Other problems in MONDEO IV (BA7)

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