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YOUR RESEARCHHow can I test my coolant level sensor?/AOS Breather hose issue
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Replace aos without dropping engine
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We have an '02 Tip and replaced AOS without dropping engine.
How can I test my coolant level sensor?/AOS Breather hose issue
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Suggestion · Original poster
Is there a way to test the sensor before installing the new tank.
How can I test my coolant level sensor?/AOS Breather hose issue
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I'm replacing my coolant expansion tank and the sensor got a little bent upon removal. I ordered a new sensor but it won't be here for a couple of days and I was hoping to button up everything today. Is there a way to test the sensor before installing the new tank. I would like to avoid doing this job twice again like I did a few years ago for that reason.
Place your Ohm meter across the two terminals, it should read "open / infinite OHMs" , then place a magnet in close proximity of the stem, the reed switch should then (close ~0 Ohm's)..
The way the low coolant system works is there is a float with an internal magnet in it that floast above the sensor when coolant is full, when coolant becomes low the float drops and the magnet becomes close to the reed switch closing the contacts..
Now I have another issue. This piece came off in my hand when I was reaching in to connect the coolant line to the bottom rear of the tank. Where does it go?
That is the hard pipe portion of the breather pipe from the AOS to the Accumulator on the UAOS system, It press fit into the Nylon section and normally doesn't come out easily since it is heated and press fit, but just put some Gorilla Snot on it and push it back on if possible.
You may have to remove the airbox, throttle body and front and rear plenums in order to get it re-attached.
That's not too difficult.
Much easier than installing the entire UAOS!
If you lower the engine slightly, you might be able to re-attach it without AB/TB/Plenums removal.
I can't locate the breather pipe from the AOS. At best, I'm going to have to remove the coolant tank again. At worst I'll need to have the car towed to my mechanic. My car is a Tip, which requires engine-out to access the AOS. I'm hoping that's not necessary.
Right now, the engine is lowered, the airbox and air pump are out, as are the UAOS accumulator and regulator. I'm looking in the general area where the UAOS accumulator would be but I'm not seeing it. I'm done for the day. If weather permits tomorrow, I'll pull the coolant tank again and see if I can reach the hose. I ordered an endoscope in case that doesn't work.
The black Nylon portion of the breather pipe is located six inches back from where the Accumulator sits, on top on the intake. The shop that did the install may have wrapped some insulation around it and other hoses together.
No need to remove the coolant tank, it is no where around there.
I'll look again but I could not find it yesterday. I don't understand how the aluminum part could have wound up under the coolant tank. After removing the accumulator, I didn't touch anything in that area.
