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The air conditioning does not cool and irregular operation of air conditioning

Q: How to fix The air conditioning does not cool and irregular operation of air conditioning in Porsche 911 (991.1)?

Diagnosis (e.g. PIWIS) and replacement of the damaged COV valve. Porsche has released updated, improved versions of these valves (new part numbers).

in Porsche 911 (991.1) (2012-2015)

Symptoms

Irregular A/C operation

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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

(997)

Refrigerant: R134a Amount (g): 850g Oil: ND8 PAO 68 lub PAG ISO 46 Oil (ml): 195ml

(996)

Refrigerant: R134a Amount (g): 900g Oil: PAG 46 PAO 68 lub PAG ISO 46 Oil (ml): 180 – 210ml

(993)

Refrigerant: R134a Amount (g): 840g Oil: ND8 PAO 68 lub PAG ISO 46 Oil (ml): 80 – 120ml

See full specification

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The air conditioning does not cool and irregular operation of air conditioning

Symptoms

A/C Technical Specifications

Other problems in 911 (991.1)

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