Question about 2000 Oldsmobile Silhouette

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My front and rear and overhead heaters will not blow air. fans work pulled them out and tested them also changed control switches and fuses any ideas please help thank you

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  • kroncone Sep 04, 2009

    yes hello its not the heat issue its the blowers are not blowing air its a 3.4 motor and oldsmobile silhouette mini van year 2000 thank you .no air from any

  • kroncone Sep 04, 2009

    what do you mean duct fan is it the blower under the glovebox and how does it control the rear blower and the overhead heat

  • kroncone Sep 04, 2009

    thanks very much for the advice



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Low coolant.

If your coolant is low, the heater core is the last place to get the hot coolant. If so, fill the system and check for leaks. If you have a 3.1 GM motor, check the intake manifold gasket.

Thermostat is stuck.

Heater core is plugged -- when the car is hot, grab the hose going to the heater core and the one coming out, they should both be hot. If one isn't, try back flushing.

Remove the two hoses to the heater core, push water through the outlet hose into the heater core. You can eliminate the heater core however by running the engine until it is up to temperature. Feel the hose going into the heater core- is it hot?-should be. Now feel the outlet hose of the heater core- is it hot? it should feel about the same. If the outlet is cold and inlet is hot, you know the heater core is plugged. you can do the same on a radiator to see if it has good flow.

Hope this helps and have a great day!

Posted on Sep 04, 2009

  • Melvin Ramos
    Melvin Ramos Sep 04, 2009

    I see. Thank you for clarification. Here's what you need to check:

    • The duct fan is bad. Replace it. Beware though: it's a pain the ****.

    • After you replace the blower motor and it still doesn't
      work, take it to a shop for testing if you can't do it. Other
      possiblities are a switch, relay, resistor, fuse, wiring. You can
      eliminate the fuse by swapping it with another of the same. You can try
      the "tap test" by rapping on the dash sometimes over the glove or on
      the blower motor itself, sometimes a weak motor may temporarily start
      working. Oh yeah, all blower motors aren't bad to change.

    Please let me know if you have more questions!

  • Melvin Ramos
    Melvin Ramos Sep 04, 2009

    I mean blower. The blower helps the coolant to rotate properly. If the coolant is not flowing correctly, then the aircon/heater would not work properly. The blower is very important. Check it and if you find its bad, then change the motor. I should not cost you too much.

    Or you may want to contact a repair person for second opinion and for estimation.



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