Originally Posted by Montoya1
Hey everyone, i installed a new VPP-655 6 months ago. Its time for maintenance as the reservoir has gotten a bit low. Should I just top it off or is a full drain reccomended? Also since the reservoir is not full could this cause the pump to make a louder than normal hum and vibration?
The rule of thumb is to drain, clean and refill a loop every 6 months or so. I usually just keep an eye on the res and fluid. If everything looks clean enough and I don't have any cooling performance degradation, I usually wait for a cleaning at the 1 year mark.
If you have fluid levels dropping in your system, fluid could be leaking somewhere. You should do a thorough check of your system. If you are using clean coolant, try wrapping each fitting in a piece of paper towel or toilet paper, running the system for a while and looking for wet pieces. Evaporation could
cause fluid levels to drop, but the most common reason is leakage.
Generally speaking, slightly reduced levels in the res shouldn't cause hum in pump, but it really depends on your setup. If you have a small res that feeds directly into your pump, and the low levels are feeding air from the res to the pump or creating a vortex inside the res, this could cause noise from the pump.