2001 honda civic lx 4dr. Heater takes 10 minutes to blow out heat. What is the problem?

Just last week the car heater worked fine and would produce heat after a couple of minutes. Now it takes more than 10 minutes to produce heat.

Did you look at the temperature gauge? If it is hanging out on the cold side that means your thermostat has failed. If not why not check the coolant level?

Heater core, or thermostat is not functioning correctly. Start with thermostat

Thermostat is stuck open or partially open.

Check the coolant. Check the temp gauge if it is slow to go to operating temp. If it does, the thermostat is stuck open.

These are the 3 most likely possibilities
1. Thermostat could be stuck partially open
2. You might be low on coolant
3. Maybe nothing is wrong and its simply taking longer because it is much colder outside(and therefore the engine is colder).

If it is significantly colder this week than last week, don't even worry. My car takes only a few minutes on normal days but when the temperature is like 20 or lower it can take up to 10 mins. But if the temperature is about the same this week then check the first 2 things i said.

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