Heater Control Valve; Operational Check - New Holland T8010 Manual

Heater Control Valve

Operational Check

The controller opens or closes the heater control
valve based on the operator selected input at the
temperature control and the temperature sensed at
the evaporator sensor.
The heater control valve can fail mechanically in any
position: open, closed or anywhere in the middle.
To confirm proper valve operation, observe the slot
on the front of the valve. Rotation of the slot must
mirror the movement of the temperature control.
NOTE: Mark the actuator, if required, to better
observe rotation.
The slot must rotate fully clockwise when the control
is turned fully clockwise; the slot must rotate fully
counterclockwise when the slot is tur ned fully
counterclockwise.
If the valve does not mirror control movement or does
not move, perform the valve motor electrical test.
Valve "Leak Through"
A common problem with the valve is hot coolant flow
when cab cooling is desired. This usually occurs by a
when a valve does not close completely. To test for
leak through from the valve:
1. Operate the A/C system at maximum cooling and
blower speed for 15 minutes. See conditions for
Performance Testing.
2. Install a stem type thermometer in a cab louver,
and record the temperature.
3. Clamp off the coolant supply line (1) before the
valve with a vise grip pliers. (The supply line
connects at the bottom of the valve.) Wait a few
minutes and check the ther mometer. If the
temperature drops, valve leak through is the
problem; replace the valve.
NOTE: Do not clamp off the heater supply line or
close the heater return line valve at the engine for
this test.
Section 50 - Climate Control - Chapter 1
50-1-77
1
2
1. HEATER CONTROL
VALVE
RD02G117
2. SLOTTED ACTUATOR
1
RD02G115