Air Conditioning problems M7060

Kaileebug1

New member

Equipment
M 7060
Aug 4, 2026
7
0
1
AL
My AC just stopped working suddenly the other day. I parked it.It was working fine, come back the next morning and nothing. The blower motor runs fine like it's supposed to, but the climate control will not operate and the compressor will not engage. The a c and recirculator button will not illuminate either. Any suggestions?
 

jaxs

Well-known member

Equipment
B1750HST
Jun 22, 2023
1,076
811
113
Texas
Oh mighty orange tractor lady,give us a comprehensive vison of this tractor's ac. I'm sorry but mighty OT lady's multi-meter isn't working today so amplifiers and controllers aren't in the wheelhouse. You might want to use your meter to find where ground is taking a wrong turn.
 

ruger1980

Active member

Equipment
L4310 w/La682, L225
Oct 25, 2020
576
249
43
CNY
Can you post/share the schematic you are working from? That may help us help you. Also there is generally a section in the WSM that explains the operation and logic of that function.
 

#40Fan

Well-known member
Jul 21, 2022
619
450
63
USA
Start with the easy stuff. Do you have power and ground to the control panel?

Red is power, black is ground.

 
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ruger1980

Active member

Equipment
L4310 w/La682, L225
Oct 25, 2020
576
249
43
CNY
You need a ground at the black with yellow wire when the blower is on. without this you will not have the AC light nor will the function turn on.

This completes the ground circuit for the AC clutch relay through the thermo amplifier and through the controller. You do have the blower on when trying the AC correct? Is there continuity through the dual pressure switch?
 

Kaileebug1

New member

Equipment
M 7060
Aug 4, 2026
7
0
1
AL
You need a ground at the black with yellow wire when the blower is on. without this you will not have the AC light nor will the function turn on.

This completes the ground circuit for the AC clutch relay through the thermo amplifier and through the controller. You do have the blower on when trying the AC correct? Is there continuity through the dual pressure switch?
Yes the dual press switch has continuity through contacts. No ground on white wire w/ black stipe going to amplifier. Amplifier contact from w/b and white open
 

ruger1980

Active member

Equipment
L4310 w/La682, L225
Oct 25, 2020
576
249
43
CNY
The W/B wire should be grounded with the blower switch on and the AC switch toggled on. The AC light should illuminate when turned on, if not it is likely there is no ground or the switch is bad. Is this so? Also is there power on Y/B wire (pin 4) of the thermo amplifier? If there is ground at the W/B wire then the issues is likely the the thermo amplifier or frost thermistor.