Question about 2005 Chevrolet TrailBlazer

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I smell antifreeze when i turn the air or heat on in my 2005 trailblazer but the radiator is never low on coolant. What could it be?

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Sounds like a small hole in the heater core. have the cooling system pressure tested and have the heater core checked. (don't know where you are but I'd do it before the snow flys)

Posted on Oct 03, 2009

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Very possible heater core could have a very slight leak in the containment box which hold it and evaporator for ac. you should check the floor on passenger side at the top of the carpet pull it back and look for dampness.

Posted on Oct 03, 2009

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How do you bleed air out of a 2005 ford explorer


Good job of tying the heater to the antifreeze overflow.

This is a guess. Replace the radiator cap and the hose connecting the radiator to the coolant reservoir. Then fill the radiator, engine, and heater hoses completely with antifreeze solution.

When the engine heats up, the coolant expands. Excess coolant is directed to the reservoir. When the engine cools, coolant is supposed to be sucked back into the coolant system. If either the radiator cap or the overflow hose has a tiny leak, air will be sucked in instead of the antifreeze returning

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the main problem would be your radiator fans don't turn on. This would cause pressure to build in your radiator causing coolant to flow over into the coolant reservoir. sometimes you might see coolant on the floor your temp gauge should also read much higher than normal. you can connect your fans directly to your battery and drive the vehicle and see if problem still exists. if not then thermo switch etc would need to be checked.

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2005 3.3 caravan heater only provides heat off idle. Fan sometimes does not come on as well. thermostat was replaced twice in summer for O/H.


You probably have air pockets in your cooling system. I have fixed a few of them by removing the Coolant Temperature Sensor just behind the Thermostat Housing. They can be kind of hard to get to on 3.3L Engines. Anyway, remove the sensor and pour antifreeze into the radiator until antifreeze pours freely out of the sensor hole. Then re-install the sensor. You may have to top-off the radiator after the sensor is re-installed.

If this does not fix the problem the you could have a bad water pump. Sometimes the stamped-steel impeller on the water pump gets corroded to the point where it cannot circulate the coolant properly.

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sounds to be a faulty thermostat did your car over heat my vehicle does the same thing its the thermostat when its cold out your vehicle loses all its engine temperature and blows cold air make sure you use 50/50 antifreeze

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Water dripping right front underneath


Is what the liquid plain water or coolant (water mixed with antifreeze). touch and smell the liquid, no smell = water, antifreeze smell and oily feel = coolant.
If plain water, could be Air Condition condensation dripping from condensation drain which is normal. (this drain is usually located near the center of the vehicle).
If coolant, could be leak(s) from: radiator, radiator hose, heater hose, water pump, engine freeze plug. A coolant system pressure test should show what is leaking.

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Antifreeze smell


If u smell the antifreeze inside the car, the heater core needs to be replaced most likely. It is leaking inside, and will get worse, to the point of 'fogging up' the windows inside.

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