HDF - Heavy Duty Flush
Heavy Duty Flush Lab Analysis Worksheet Download
Heavy Duty Flush Procedures
STEP 1.
- Record water pump pressure and all temps.
- Drain coolant.
- Remove Surge/Day Tank Caps.
- Install 1” ball valve on each side of block underneath rail.
- Fill with HDF until overflow from Surge/Day Tank.
- Run Unit 7 days.
STEP 2.
- Power wash out Surge/Day Tank while full. Let particles overflow. (15 minutes)
- Drain Flush via ball valve on each side of block underneath rail.
- Re-fill with HDF.
- Run Unit 7 days.
- Power wash out Surge/Day Tank while full. Let particles overflow. (15 minutes)
- Drain Flush (dispose as you would old coolant)
STEP 3.
- Shutdown/Remove Surge Tank Cap.
- Power wash Surge Tank with STH - Surge Tank Hose(while still hot and full). Let particles overflow. (15-20 min)
- Drain Flush via ball valve on each side of block underneath rail. (dispose as you would old coolant)
- Fill with deionized water until overflow from Surge/Day Tank.
- Run Unit until up to temperature and thermostats open.
- Continue to pump in deionized water until overflow at the top from Surge/Day Tank before opening ball valves. (2 x volume) overflow until clean.
- Inspect water pump and replace thermostats.
- Drain Unit / Fill with New Coolant*
*(Best Practice) Never leave or run with water only.
Fill with coolant mix and 3% CRI – Corrosion Rust Inhibitor