Heater

Supposing you're driving along on a cold day and suddenly your heater turns cold.

It doesn't usually happen without warning; you're likely to notice your vehicle gradually putting out less and less heat. What's the problem?

The Car Care Council suggests some common factors to consider. Is the blower working? Maybe the motor and/or switch are not working. Perhaps it's a fuse or circuit breaker. How about: the movement of air through the heater itself? Is it going where it is supposed to go or is it misdirected?

Next, the source of heat, the engine's cooling system. If the engine is running too cool you not only won't get heat, you'll waste gas. Finally, the heater core, through which hot engine coolant flows. Is it obstructed?

Lack of heat not only is uncomfortable for driver and passengers, it's a signal there's something wrong with your vehicle. An engine is designed to operate within a prescribed temperature range, controlled by the thermostat, which directly affects engine performance and wear.

In addition, an inoperative heating system may include the windshield defrosters, affecting your vision. When in doubt, check it out, says the Council.

For more car tips log on www.carcarecouncil.org.