Robinair 75700 Coolant Exchanger - Manual (Page 13)

11
Cool Tech 75700 Cool X change
Troubleshooting
Coolant exchanger does not
operate.
Unit does not relieve pressure
in vehicle cooling system.
OR
Unit does not lower coolant
level in radiator or coolant
reservoir.
Unit does not hold pressure
during pressure test.
No, or slow, exchange.
1. Air supply is not connected to
unit.
1. Filter screen on waste coolant
hose is plugged.
2. Waste coolant tank is full.
3. Air supply pressure is too low.
4. Unit hoses are assembled
incorrectly.
1. Hoses connected to coolant
reservoir not pinched closed.
2. Test pressure is too high.
3. Leak in cooling system.
1. Vehicle requires a different
hookup.
2. Valve on new coolant hose not
completely OPEN.
3. Filter screen on waste coolant
hose is plugged.
1. Attach shop air line to unit that
is regulated to supply 80–120 psi
of clean compressed air. Refer
to “Setup” in this manual.
1. Unthread cap from filter; rinse
screen and inside of cap under
running water. See “Mainte-
nance.”
2. Connect siphon tube to black
hose; insert tube into waste
barrel; turn valves to EMPTY
WASTE. See “Maintenance.”
3. Regulate shop air line to 80–
120 psi of clean compressed air.
See “Setup.”
4. Attach black hose to top
coupler; attach clear hose to
bottom coupler. See “Setup.”
1. Use pliers to pinch off coolant
overflow hose and other hoses
connected to coolant reservoir.
Refer to “Vehicle Connections.”
2. Test pressure must be below
pressure indicated on radiator
cap, overflow cap, or vehicle
specs. See “Pressure Test.”
3. Repair leak and repeat “Pres-
sure Test.”
1. Connect clear hose to engine;
connect black hose to radiator.
See Tech Tip in “Exchange
Process.”
2. Open valve. See “Exchange
Process.”
3. Unthread cap from filter; rinse
screen and inside of cap under
running water. See “Mainte-
nance.”
contd.
Symptom Cause Solution