Been trying to figure this one out...during the winter while using the heater I get a blast of cold air when I make a sharp right turn...it seems to come from under the dash. I haven't found anything loose or disconnected. A couple of other H3 owners have had the same thing happen. Anyone have this happen to them?
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blast of cold air
- Thread starter Odimus
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Worn out blender door? I believe there are two under the dash in the driver footwell. Run the HVAC calibration procedure and watch the two doors to see if they both move. Or just see if one doesn't seem to move properly when changing vent locations and temps
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Pappibri
Well-Known Member
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I have had that happen as well. Thought it odd as well
That IS weird. Right turn only? Would have to be an electrical issue, since both blend door actuators (motors) are gear driven and are oriented with a front/rear axis. In other words, the doors don't rotate sideways, but rather front/back, so a turn couldn't physically open or close them. But I can't think of anything electrical that would be tied to a hard right turn.
I agree with alrock; run the calibration procedure and see if both blend doors rotate fully during that process. You can look up under the dash on the driver side and see both of them (there's also a third actuator, higher up near the top, that controls the output direction (dash, floor, defrost), but the two lower ones are the temp control.
I agree with alrock; run the calibration procedure and see if both blend doors rotate fully during that process. You can look up under the dash on the driver side and see both of them (there's also a third actuator, higher up near the top, that controls the output direction (dash, floor, defrost), but the two lower ones are the temp control.
4speedfunk
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That's an air pocket in the cooling system. Air migrates to the highest point (heater hoses) and this will cause the water pump to cavitate. When this happens...flow of coolant stops. Sudden braking, acceleration, or turning will temporarily slosh the air pocket into the pump....but as soon as you level out, the fluid continues on its normal path.
You need to purge the air with a vacuum pump connected to the radiator...or sometimes you can do this by parking on a steep hill. When I say steep...I mean straight up! Park the truck nose up in a ravine....remove the radiator cap...let it sit overnight. The next morning, fill it completely up (including the reservoir) and back it down to level ground. Let it idle for a half hour. This works most of the time but, not always.
You can also bleed the air by loosening the heater hose clamp at the firewall and revving the motor. This is very messy however and you can get burnt.
To do it right and safely...use the vacuum pump.
You need to purge the air with a vacuum pump connected to the radiator...or sometimes you can do this by parking on a steep hill. When I say steep...I mean straight up! Park the truck nose up in a ravine....remove the radiator cap...let it sit overnight. The next morning, fill it completely up (including the reservoir) and back it down to level ground. Let it idle for a half hour. This works most of the time but, not always.
You can also bleed the air by loosening the heater hose clamp at the firewall and revving the motor. This is very messy however and you can get burnt.
To do it right and safely...use the vacuum pump.
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