What are the symptoms of Blower vents emit warm air when A/C is turned on in Opel Meriva B?

No blowing from vents. Blower works only on highest speed. Warning light on dashboard

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Blower vents emit warm air when A/C is turned on

Q: How to fix Blower vents emit warm air when A/C is turned on in Opel Meriva B?

Replacing the faulty engine cooling system thermostat and deleting errors in the ECU. If an Opel arrives with a 1.4 Turbo engine, there is no air conditioning and the fan under the hood howls like a vacuum cleaner: check engine errors immediately. Replacing the thermostat solves the problem of the air conditioning not working. This is an officially confirmed repeatable bug.

in Opel Meriva B (2010-2015)

Symptoms

No blowing from vents
Blower works only on highest speed
Warning light on dashboard

DTC error codes

P0128 (Coolant Thermostat - Coolant Temp Below Thermostat Regulating Temperature)

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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

Refrigerant: R134a Amount (g): 580g Oil: PAG PAO 68 lub PAG ISO 46 Oil (ml): 125ml

Z13DT/Z17DT + DTL + DTH/Z14XEP/Z16SE/Z16 + Z18XE/Z16LET

Refrigerant: R134a Amount (g): 690g Oil: ND8 PAO 68 lub PAG ISO 46 Oil (ml): 150ml

B 06.–03.2017

Refrigerant: R1234yf Amount (g): 565g Oil: - Oil (ml): - ml

See full specification

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