• Heater didn't kick on Saturday during my 2hr drive in -4deg. That was fun.

    Coolant levels seem fine, everything electronically seems perfect.
    Annoyingly there's no engine temp gauge on the dash, but the car drove great.

    Likely a thermostat fault?

  • Blocked heater matrix? Was it working before? Do the water pipes near the top of the rad feel hot

    What car?

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