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Old 01-13-2020, 07:38 PM
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andrewwynn andrewwynn is offline
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"warm" or operating temp? If the heater core hose is cold implies the heater valves are shut but can mean other things. Example: wife's car output cold air at idle but warm air at 2000+ RPM because the aux water pump was shot.

Get the core temp reading using a scanner or the OBC hidden menu and confirm the engine is getting to 90C. The coolant can be quite warm to touch yet pointless to heat a car and the heater valves won't open until the coolant temp reaches a minimum.

If the coolant temp sensor is broken it can report a much colder temp than actual and never open the valves.
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