Car won't heat up?

Question:
When it's cold, I will start up the car to try to warm it up. But it'll never blow out warm air until I actually start driving the car, even if I let it sit for a half hour! I notice that the temperature gauge is always on the cold side. What could be the problem?

Answers:

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First check the coolant - pop the radiator cap off, and make sure it is full to the top with 50/50 mixed coolant and water.

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Top off the overflow while you are at it.

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Some cars don't heat up very well when they are sitting - especially older ones with belt driven fans. You can replace the belt driven fan with an electric one, which will come on with a relay only when the car actually gets hot.

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If you already have an electric fan - and it comes on immediately even when the car is cold, you might have a stuck relay.

I forgot about the thermostat--most people went with that, but if that doesn't fix it, then go down my list.

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most likely, your thermostat is stuck in the open position
replace thermostat, usually less than 5 dollars, and should be fine

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probably a stuck thermostat...does your car overheat when it is hot out?

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replace the thermostat

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assuming that there are no driveability concerns, it sounds as though your heater core is plugged up. as far as the temp guage, that is probably the sending unit. both of these problems are easily (and cheaply) fixed

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Car won't heat up?

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