What are the symptoms of Unusual noise and metallic grinding when A/C is on in Ford Mustang 4.6L?

Unusual noises when A/C is turned on. Frost or ice on pipes under the hood. Slow loss of refrigerant

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Unusual noise and metallic grinding when A/C is on

Q: How to fix Unusual noise and metallic grinding when A/C is on in Ford Mustang 4.6L?

Systemic compressor fault. The manufacturer requires repairs based on TSB bulletin 06-14-3. The front clutch disc (with a redesigned version), pulley, coil and valve/orifice tube should be replaced. An extremely important additional step is to drop in less (reduced) refrigerant weight (26 ounces of R134a to be exact) and stick new specs under the hood.

in Ford Mustang 4.6L (2005-2006)

Symptoms

Unusual noises when A/C is turned on
Frost or ice on pipes under the hood
Slow loss of refrigerant

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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

Standard

Refrigerant: R1234yf Amount (g): 600g Oil: WSS-M2C300-A2 PAO 68 AA1 lub PAG ISO 46 YF Oil (ml): 100ml

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