High Priority 99% confidence

Unstable A/C operation in AUTO mode / incorrect cabin temperature

in Honda Civic (2000-2024)

Symptoms

  • Unusual noises when A/C is turned on
  • Warning light on dashboard

DTC error codes

DTC 21

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A/C Technical Specifications

1,0 VTEC / 1,5 VTEC / 2,0 typ R

Refrigerant: R1234yf Amount (g): 430g Oil: POE PAO 68 AA1 Oil (ml): 100ml

1,6 iDTEC

Refrigerant: R1234yf Amount (g): 420g Oil: POE PAO 68 AA1 Oil (ml): 100ml

1,0 VTEC / 1,5 VTEC / 2,0 typ R

Refrigerant: R134a Amount (g): 430g Oil: ND8 PAO 68 AA1 lub PAG ISO 46 Oil (ml): 100ml
See full specification

Other problems in Civic

Weak cabin cooling / Loss of performance and unpleasant odor (musty/mold)

High Priority

Air conditioning stopped cooling / no response to AC button

High Priority

A/C cooling is weak and gradually loses performance

High Priority

Unusual noise and metallic grinding when A/C is on

High Priority

Air conditioning stopped cooling / no response to AC button

High Priority

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