New Holland CX720 Repair Manual page 2987

BODY AND STRUCTURE - ENVIRONMENT CONTROL Heating system
ENVIRONMENT CONTROL Heating system - Preliminary test
(E.40.B - F.40.A.20)
1. The most important factor in heater air conditioning
troubleshooting is verification of the problem by ob-
serving the system operation and isolating the prob-
lem area.
Operational Checks - Heating
2. Check that both engine coolant shutoff valves at the
engine block are open.
3. Check that the heater inlet hose at the rear of the
engine block is warm.
4. Check that the engine coolant temperature is at least
76 ° C (170 ° F).
5. Check the cab air filter to check that it is clean and
free from obstruction to air flow.
6. Check the recirculation filter to see that it is clean and
free from obstruction to air flow.
2 4/7/2006
E.40.B / 7