Question about 2001 Subaru Forester

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Temperature gauge past "H", air from heater comes out cold.

Once the engine warms up, then the TG needle goes past H, it can be after 15 minutes or 45 minutes running. Heater air cools from very warm. Sometimes it is running normal, you stop at an intersection and the needle begins to inch to H. After take off, it may go back to normal or not. Once is on H, it is unlikely to come down. I have notice that by stepping on the gas on neutral, heater air warm up for a few seconds and then cools down. I open the hood and you can "feel" the engine is very hot, and the water/antifreeze reservoir is full. Can not see any leaking.

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  • Charles Scheiner May 11, 2010

    You did not say whether or not you have white smoke from the tailpipe, or if the car is pushing coolant out of the reservior. It sounds to me that the car is heating up when stopped at a light or stopped in traffic. Is this correct? If this is so, and the car is not heating up when you drive at a speed over 30 mph, then the problem may be that your cooling fan switch is bad. The fan (on the radiator) should kick on after a minute or so when the car is idling at a stop. The fan does not need to run when the car is moving because the natural flow or air moves through the radiator as the car goes forward. But when stopped, the engine is still making heat, and the fan needs to run to cool the radiator. If the fan does not come on, the engine begins to overheat, and forces coolant into the reservoir, and will overflow onto the ground...which you will not see as you are driving. But now the coolant is too low to flow through the heater core, so you have little or no heat. When you rev the motor, the water pump will pull extra coolant and give you a short burst of heat. But if you have been running low on coolant for very long, you may have cracked a head or blown a head gasket. This will also cause the engine to push coolant out, and can also split a radiator...I happened to me...on my Subaru. I hope this is not your problem since it is a costly fix. Any more info you have will help me figure this out. Chip

  • Charles Scheiner May 11, 2010

    Have you had to add coolant on a regular basis? Is the car pushing coolant out of the reservoir? Do you have white smoke coming from the tailpipe? Chip

  • Lisa Billiot
    Lisa Billiot May 05, 2014

    The car ran hot on the highway and no smoke was coming out but you could smell a burn smell I just tried to cool the engin down with the heater on and the heater blew hot air



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Open thermostat or instrument voltage stabilizer.

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