Generac — Draining and Flushing Coolant System
Maintenance · Cooling system
From a Generac owner's manual covering: XG03245, XG04045, XG04845. Check it applies to your exact model before use.
Applies to: Generac Model, Generac Number, Generac XG03245, Generac XG04045, Generac XG04845
Before you start
- Risk of burns. Allow engine to cool before draining oil or coolant. Failure to do so could result in death or serious injury. (W000139)
Procedure
- Disconnect and empty coolant overflow reservoir.
- Rotate and remove plastic cover at top of enclosure.
- Slowly unscrew radiator cap.
- Locate drain screw at bottom left of radiator; open drain.
- Remove coolant drain hose from clamp; remove plug; drain coolant.
- Install drain plug and hose; close radiator drain screw.
- Fill radiator with de-ionized or distilled water and flushing product; use 2.9 US gal (11 L).
- Install radiator cap.
- Press MANUAL to start engine; run until thermostat opens.
- Inspect hoses for leaks; press OFF; allow engine to cool.
- Repeat steps 4-19 to drain.
- Add recommended coolant; top off radiator and overflow bottle.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 2.9 US gal (11 L) coolant
Full service-parts list: Generac Model →, Generac Number →, Generac XG03245 →, Generac XG04045 →, Generac XG04845 →
Source: Generac owner's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.