Question about 2001 Pontiac Montana

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2001 pontiac montana heater is now blowing cold

But if I turn off the heater the car overheats.... so I turned it back on and it was sort of warm, I think just engine air, not really the heater working. for the last little while there has been a smell, like burning oil or something like that from the car once driving

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  • Anonymous Jan 26, 2009

    I also have issues with my heater it works fine if the engine is running at 1500 rpms or more if it is at idle it blows cold air even if the engine is at running temp. 
       jnm

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You need to check coolant level in rad, when cooled down, and top up your return bottle to marked level.
Start by having coolant (antifreeze) ready, remove your rad cap, and top up the rad level, then start the vehicle, and turn on your heater (not defrost) . Let it run with cap off for a while, and keep an eye on level of the rad & top up as necessary, but leave an inch or so from top.Let it run & observe your guage while doing so, and when gauge gets to normal operating temperature, your rad fan should come on, run for a while then shut off for a while, then back on again after little while, and off again. Let it do this about 3 times, top off the rad as described above, put cap back on tight, and top up your coolant return bottle to mark on side. If your rad fan doesn't come on around normal operating temperature, and gauge heads too much towards hot reading, shut vehicle off, that's an indication that your rad fan fuse has blown, or relay, or fan itself is defective. If all works well & you now have heat, great, but keep an eye on your coolant return bottle level for next while to see if it keeps going down, and add as needed if it is. If the level in bottle continues to go down, you've got a leak in the system somewhere & need to address it a.s.a. p. to hopefully avoid bigger problems, but we'll get to that only if we need to. Do what's up above and let us know the results.

Posted on Jan 11, 2009

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