Hello, I am posting on this forum for very first time.

My car is 1999 Volvo S80 T-6

I am considering a full radiator hose replacement (upper and lower), in addition with new coolant liquid (50/50) using Antifreeze Pentosin or Volvo Antifreeze/Coolant 1 3.78 liter with other 3.78 liter deionized water. But considering my car at 130k mileage right now, should I consider replacing water pump also to help car run longer?

First thing there's video that shows how to replace whole radiator hose and draining old antifreeze liquid out, and putting a new antifreeze in:
Sorry for long youtube link. This procedure looks very easy. Although a stupid question is: where to find and replace water pump?

The reason I planning to replace liquid coolant was because the display shows up stating that the liquid coolant is low right now.

Parts to get from: RockAuto Parts Catalog

Liquid Antifreeze / Coolant: Pentosin or Volvo Brand with Deionized Water. (Might need help finding which good site to buy from).

Any answers would be much appreciated!

 

Have you had the Timing Belt replaced yet? Mechanics usually replace water pump with serpentine belt, since the belt is off. You are about due for replacement if not done yet. Have mechanic replace pump and idler pulley at same time.

 

If there is a message saying low coolant then just top it off with volvo coolant, and the message will go away. A radiator flush is not hard at all. And twoarcadians is correct, you should worry about your belt if it hasn't been replaced already and a mechanic normally gets the belt and waterpump in a kit. Depending on how much he charges your looking at a grand for the Timing belt change.