Thermal Expansion Valve Testing - New Holland T8010 Manual

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IMPORTANT: The following test is performed with the thermal expansion valve mounted in the system. No repair

or adjustment is recommended for the valve.

See ACCESSING THE HVAC BOX, page 90.

Disconnect the low pressure cutout switch. Install a

jumper wire across the harness leads.

Start the tractor and run the engine at 1500 RPM.

Turn blower speed control to maximum position,

temperature control valve fully clockwise, ATC switch

to DEFOG/DEFROST or Standard A/C switch to ON,

and check the low pressure gauge reading.

Compare the gauge readings to the Temperature/

Pressure chart for your ambient temperature and

Remove thermal insulation tape from top of valve.

Use the palm of your hand to warm the expansion

valve and watch the low pressure gauge.

The valve will open and pressure should rise.

Use ice to cool the expansion valve and watch the

low pressure gauge.

Within seconds, the expansion valve will close and

the pressure must drop at the low pressure gauge.

If there is little or no change at low pressure gauge,

the thermal expansion valve must be replaced.

Section 50 - Climate Control - Chapter 2

THERMAL EXPANSION VALVE TESTING

Standard HVAC Box Shown

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T8020 T8030 T8040