High Priority 95% confidence

Air conditioning stopped cooling / no response to AC button

Q: How to fix Air conditioning stopped cooling / no response to AC button in Ford S-MAX (WA6)?

The air conditioning compressor did not start, and error P0645 (clutch control circuit) was stored in the controller memory (PCM). Instead of routinely replenishing the refrigerant and replacing the clutch, after in-depth diagnostics, two related failures were detected: a broken cable responsible for the clutch activation signal and a leaking condenser (capacitor). The repair consisted of locating and repairing the broken electrical harness, replacing the leaky condenser and refilling the system with refrigerant, which permanently restored cooling.

in Ford S-MAX (WA6) (2009-2009)

Symptoms

Different temperature on both sides of the cabin

Verifying license...

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

1,5 i + 2,0 i EcoBoost

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

2,0 TDCi

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

1,5 i + 2,0 i EcoBoost

Refrigerant: R134a Amount (g): 570g Oil: WSH-M1C231-B PAO 68 lub PAG ISO 46 Oil (ml): 150ml

See full specification

Have this problem?

Generate a personalized AI report for your Ford S-MAX (WA6) or book a workshop visit.

Generate AI report Schedule visit

Air conditioning stopped cooling / no response to AC button

Symptoms

A/C Technical Specifications

Other problems in S-MAX (WA6)

Have this problem?