U3574

Coolant Mixing Valve

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$28–89 (est.)

Symptoms

Uneven interior heating
Engine overheating or insufficient warming up
Hot air on one side only
Flashing temperature indicator

Causes

Mix valve malfunction
Open or short circuit in the circuit
Poor contact in the connector
Control module malfunction
Mechanical valve jamming

How to Fix

Check valve circuit fuse
Check valve resistance
Inspect connectors and wiring
Check valve operation when voltage is applied
If necessary, replace the mixing valve

Related codes

U3573 U3575 B3574