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A/C works intermittently or cuts out during driving

Q: What are the symptoms of A/C works intermittently or cuts out during driving in Toyota Corolla E15/E18?

Weak cabin cooling. Air conditioning works intermittently

Q: How to fix A/C works intermittently or cuts out during driving in Toyota Corolla E15/E18?

Replacing the control valve (solenoid) in the compressor body. This does not require replacing the entire compressor as long as the system is clean. Toyota often suggests replacing the entire compressor (PLN 3,500). The valve itself costs PLN 150-250 and is replaceable from the bottom of the car after removing the cover. Always check that the valve resistance is approximately 11-13 Ohm.

in Toyota Corolla E15/E18 (2009-2018)

Symptoms

Weak cabin cooling
Air conditioning works intermittently

DTC error codes

B1421 (Solar sensor - often false error)

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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

(E21)

Refrigerant: R1234yf Amount (g): 475g Oil: PAG YF PAO 68 AA1 lub PAG ISO 46 YF Oil (ml): 80ml

(E21) Hybrid

Refrigerant: R1234yf Amount (g): 475g Oil: ND11 POE 120 GT Oil (ml): 86ml

XII - (E210)

Refrigerant: R1234yf Amount (g): 400-450g Oil: PAG YF ISO 46 Oil (ml): 100 - 130ml

See full specification

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