The sensor is indeed bad, new one coming. But now, I have a lot of air in system. Can I run the bad tank with sensor disconnected to add badly needed coolant as the engine idles to bleed the system?

Asked by Dec 31, 2016 at 10:27 PM about the 2004 Cadillac DeVille Sedan FWD

Question type: Maintenance & Repair

I had removed the recovery tank to wash it out as recommended on a
Youtube video. I also tested the sensor and found it to be defective. I've
ordered a new tank and sensor.  While doing so I noticed that with the
sensor no longer connected to its cable, water flowed out of the tank easily.  
At this time, there is so little coolant in the engine that the heater provides no
heat and the engine overheats if I run it too long.

While waiting for the new tank, I am tempted to hook up the defective tank
and use it while disconnected from the sensor cable to add badly needed
coolant to the system. There is so little coolant in the engine that the heater
no longer provides heat, and the engine overheats when I run it for 5 to 10
minutes.

The system has a lot of air in it now, all of which will have to be bled out.
Should I hook up the defective tank, leaving the sensor cable disconnected
and the pressure cap off to enable me to add coolant to the system while the
engine idles? It would be very encouraging that I'm getting somewhere if I
can run the engine for longer than 5 minutes and had heat in the cabin while
doing so.

1 Answer

263,975

You should't be running/driving the vehicle till you get the new reservoir as it is under pressure with the rest of the cooling system. Once you have the new reservoir, you can properly fill the system and bleed the air.

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