No need to torque it tight as this can weaken or break it. Hint: to close the bleeder, just turn the screw until the O-ring is below the top of the hole. Close the tank cap.ħ) Test drive and check for having heated air in cabin. Keep engine idling for next steps.Ħ) Crack open the bleeder again to let air out and close it when no more air bubbles. Place the funnel in the mouth of the coolant expansion tank, and start to slowly add coolant. Place towels under the car under the expansion tank. Step 3: Undo the bleed screw at the top just a bit. Step 2: Fill till the leveler in the expansion bottle pops up. Hey Guys, whenever I turn on the heater in my car the coolant light comes on within 30 seconds and goes out within a few minutes after I turn it off. Turn on heater, set to highest temp and lowest fan speed. Step1: Make sure the fluid is a 50/50 mix of coolant and filtered water. The cooling system on our E46s are a closed, pressurized system. While youre at it, you might want to diagnose where the coolant went. Close the bleeder and screw the tank cap by one turn to avoid coolant shooting out for the next step when rev-ing up the engine.ĥ) Rev it up to about 2500 - 3000 RPM a few times to push out any air pockets (in the head and the heater core) into the upper hose/tank. Turn ignition to position 2, do not start engine. The heater core is tied to the cooling system, and an improperly bled cooling system (or having low coolant) will trigger that light and your expansion tank will be empty. Important: Do not let engine running more than 7 minutes total while the tank cap is not closed, to avoid damaging the cylinder head.Ĥ) Crack open the bleeder to let air out and close it when no more air bubbles. Do not overfill to top of tank.ģ) close the bleeder, set heater to hot and fan low, run engine at idle. Either way, the car will not run long during any of these three conditions. They must have bled it well, otherwise it would have overheated over 1000 miles. Look for white residue, that gives the leak away. Jack up the front of the car and look up toward the water pump and thermostat. Try to bleed the air out using this method:ġ) engine cold, car on flat ground level is preferred, or car parked with front on higher ground than rear.Ģ) remove bleeder and tank cap, fill coolant to the MAX marker on the tank using the red rod as indicator. When an E46 overheats, the result is usually a blown headgasket causing coolant consumption, coolant/oil mixing, or an overpressure situation in the cooling system. If its a slow leak, you wont see any coolant underneath. This means there is tons of air in the system. Click to expand.Hissing, coolant leaking, but the tank is still full with coolant.
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