HDF - Heavy Duty Flush

Heavy Duty Flush Lab Analysis Worksheet Download

 

Heavy Duty Flush Procedures

 

STEP 1. 

1. Record water pump pressure and all temps.
2. Drain coolant.
3. Remove Surge/Day Tank Caps.
4. Install 1” ball valve on each side of block underneath rail.
5. Fill with HDF until overflow from Surge/Day Tank.
6. Run Unit 7 days.

 

STEP 2.

1. Power wash out Surge/Day Tank while full. Let particles overflow. (15 minutes)
2. Drain Flush via ball valve on each side of block underneath rail.
3. Re-fill with HDF.
4. Run Unit 7 days.
5. Power wash out Surge/Day Tank while full. Let particles overflow. (15 minutes)
6. Drain Flush (dispose as you would old coolant)

 

STEP 3.

1. Shutdown/Remove Surge Tank Cap.
2. Power wash Surge Tank with STH - Surge Tank Hose(while still hot and full).  Let particles overflow. (15-20 min)
3. Drain Flush via ball valve on each side of block underneath rail.  (dispose as you would old coolant)
4. Fill with deionized water until overflow from Surge/Day Tank.
5. Run Unit until up to temperature and thermostats open.
6. 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.
7. Inspect water pump and replace thermostats.
8. 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