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Jeremy, Certified Truck/Bus Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 3382
Experience:  ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, EPA 608/609 HVAC Certified, Steering/Suspension and ABS/Brakes Technician
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I have a question about the Volvo Coolant Level Sensor. Why

Customer Question

I have a question about the Volvo Coolant Level Sensor. Why was the design changed from Part No. 22229750 to Part No. 22564822? It appears that the Probe was made shorter. Can you explain why this was done?
Submitted: 1 year ago.
Category: Medium and Heavy Trucks
Expert:  Jeremy replied 1 year ago.

My name is ***** ***** I will assist you.

The reason is because the sensor kept pushing coolant through it, which got to the ECM and caused the ECM to be replaced.

Volvo engineers thought that the longer stem was getting moved easier from the coolant sloshing around when the vehicle was going down the road and causing it to loosen aroumd the probe giving coolant the accessbit needs to get in the wire sheeth.

Problem is, it still does it. Volvo never went back to the old omene for obviois reasons at that point for they spent thousands on the slight design changes to the sensor.

The old design was worse, but the issue still happens.

This is why on the 2015 and 2016 models, sensors are double sealed and there are now jumper harnesses on them imstead of plugging to the main harness.

Customer: replied 1 year ago.
Dear Sir:I am having a lot of trouble understanding your reply. There are so many spelling errors that I am having difficulty understanding what you are saying. For instance, what is:1. omene (why is it obvious - I do not understand)
2. accessbitAlso, what does ECM mean?Does Part No.###-##-####have the double seals that you mention?Lastly, I still do not understand why the new Probe is shorter.Thank you for your additional assistance.Stephen Boyd
Expert:  Jeremy replied 1 year ago.

I responded with my phone. Not sure why there were spelling errors. Auto correct must have messed it up.

The ECM is the Engine Control Module on the truck.

The reason for the shorter probe is because the coolant will slosh around when it is going down the road. The Volvo engineers thought a shorter probe would keep the sensor from cracking on the inside and allowing coolant into the harness, which would work its way to the engine computer and burn out the computer.

Picture a bolt, say a 5/8" head. Now you havea long breaker bar and a short ratchet. You try the short ratchet and you have to use a lot of force to move it. Now you use a long breaker bar and you use little force, right?

The probe is the same way with the water splashing in the tank. It's simple physics. Longer probe, easier for water to cause the probe to crack inside. Shorter probe harder for the water to cause the probe to crack. This is why the probe is shorter.

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