Question about 2000 Oldsmobile Alero

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My temperature gauge read red... the light came on and I turned the heater on to try to help it cool down,it worked, but there was no heat coming from the vents. when i turn the heat off, temp rises again...(2000 oldsmobile alero GLS, V-6)

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  • Oldsmobile Master
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Have you checked the coolant level? If it is low, what you describe will happen, the engine will run hot, and the heat won't seem to work (coolant level too low to circulate through the heater core). Hope it's that simple, if not, let me know and I'll attempt to help further. Good luck!

Posted on Nov 17, 2009

Testimonial: "Hopefully that is the only problem with the coolant system. thanks for the tip, I appreciate it."

  • Curt Downs Nov 18, 2009

    Thanks for rating my answer, let me know how you make out, I'll help further if needed. curt

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How much does it costs to replace or repair a fan system in my van? My van gets cold when I am driving but the moment I am stopped at a light or in traffic the temperature gauge starts going up closer to...


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It actually sounds to me like you're low on coolant. My Jeep leaks coolant and whenever it gets low the temp gauge will go real high and then drop, and the heater doesn't work well. This is because the cooling system of your car is supposed to be a closed system, full of coolant and no air. When coolant leaks out, the space it used to occupy is now occupied by air, which does not transfer heat well. When 'air' is passing through your cooling system, no heat can be transferred from your engine to the heater and radiator, resulting in a hot engine and no heat at the heater. Then when a pocket of water passes through the system, the temperature gauge quickly falls as the water absorbs the heat from the engine. The hot water that cools the engine is where the heater gets it's heat from as well, so when water passes through the heater core, the heater works, but when it's filled with air, it doesn't.

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As for the water pump. If the water pump was bad, your temp gauge would go into the red and stay there. Water pumps generally don't work intermittently. Either it's good and ot works, or it's bad and it doesn't.

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