If it doesn't function as intended, it should release the pressure sooner, not later. Ive never touched my coolant, however, I believe they did it when the water pump needed to be replaced and Im currently at about 135K miles. I suppose it's possible a cap could "stick" with corrosion or whatever, but I've never heard of such, nor do I find that possibility at all likely. In cold temperatures, my engine coolant light turns on at engine start up and then turns off relatively quickly after that. The cooling system on our E46s are a closed, pressurized system. While youre at it, you might want to diagnose where the coolant went. We are talking about maybe a pint or two of coolant being pushed out, if that? What exactly am I missing the cap should always function as intened, because springs don't increase in pressure as they age. 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. So I kept driving the car and thinking about it. I heard a small gurgle and hiss and noticed that the tank was full. I think I had waited about an hour before opening the tank. P1290 Low Coolant Light On P2185 Engine Coolant Temperature Sensor 2 Circuit High Input Basic troubleshooting: If you’re experiencing issues with your BMW heater, there are some basic troubleshooting steps that you can try before bringing your vehicle to a technician. If the level is below the minimum mark, you need to top it off. There are usually markings indicating the minimum and maximum levels. Look at the side of the reservoir to see the current coolant level. Without coolant flow to the heater core, the heater will not be able to produce warm air. If the heater control valve breaks or gets stuck, the coolant flow to the heater core may be restricted or stopped completely. Install the cap and drive the car, with the heat on but only fan speed 1. Only run for about 1 min so the level stabilizes. Remember less is more, so the float bobber should be at the top-near the neck. So I decided to check my coolant expansion tank. For coolant transparent reservoirs, you can check without opening the cap. One of the first symptoms of a faulty heater control valve is a heater that fails to produce warm air. Bring the engine to 1,500-2,000 rpm with the heat full hot and full fan. There is no thermal runaway, no unlimited expansion-as you imply with "nothing will stay in the way of expansion." No, of course not. I recently had my coolant light come on intermittantly on my 2006 BMW X3. If you overfill, no explosion, just a release of pressure until it returns to equilibrium. You have the force of the spring on one side, which is equivalent to 2 bar (given the area of the plunger), acting against the pressure from thermal expansion within the system. I haven't dissected a BMW radiator cap, but afaik all radiator caps are basically a plunger with a spring.
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