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2013 Mazda CX-5 - Cold light stays on

2013 mazda cx5 cold light not going off and poor heat

Offhand it sounds like a bad thermostat.

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Get it diagnosed quickly. It is not a good idea to ignore this one.

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Check coolant level in cold radiator and if full, replace thermostat,.

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A concern here is that there’s coolant leak. That can cause severe engine damage. Early signs are consistent with low level of coolant: it’s too low to reach one or more temperature sensors, or the place on the engine where a hose connects to the heater core.