Page 1The Rear A/C will not operate

The compressor will not

come on.

Start on page 2

The evaporator fan

will not come on.

Start on page 13

The condenser fan

will not come on.

Start on page 12

Action YesTest

No GoExplanation

Legend

Symptom

Have the enginerunning.

Turn on the A/C fanswitch to low, and

turn the A/C thermoswitch all the way to

cold.

Remove the rear padfrom the rear wall.

Find the rear A/Cboard, in the back ofthe bus, on the rear

wall.

Test 1. Find the fivepin connector on the

rear A/C boardmarked K1.

Check for IgnitionVoltage on pin 3

where the red/whitewire is connected.

I have ignitionVoltage on Connector

K1 Pin 3.

I Do Not haveignition Voltage onConnector K1 Pin 3.

Go to page 5.

Go to page 3.

Page 2

Start over.

Page 3I Do Not haveignition Voltage onConnector K1 Pin 3.

Test 2. Do you haveignition voltage tothe A/C fan switch?

Yes

NoTest 4. Check outthe A/C fan switch.

Is the A/C fan switchgood?

No

Replace the A/C fanSwitch.

Test 5. Check forcontinuity on the

red/white wire fromthe A/C fan switch tothe K1 connector and

find the open. Start over.

Test 3. Do you havethe EP2 or the EP3electrial center?

I have the EP3

I have the EP2

Go to page 5.

Go to page 4.

Yes

Yes

Repair the open wire.

Start over.

Page 4I have the EP2

Test 6. Do you haveignition voltage atthe EP2 ElectricalCenter above the

driver door onConnector J1 pin 3?

No

Check for continuityon the white/blue

wire from the A/C fanswitch to the J1

connector at pin 3and find the open.

Test 7. Do you haveignition voltage atthe EP2 Electrical

Center at J4 pin 4 onthe 20P wire?

Run tests on the EP2electrical center for

an open, bad fuse orrelay in the board.

No

Check for continuityon the 20P wire fromthe OE tie-in locationfor ignition voltage.

Yes

Yes

Start over.

Page 5I have the EP3

Test 8. Do you haveignition voltage atthe EP3 ElectricalCenter above the

driver door onConnector J4 pin 2?

Check for continuityon the purple/black

wire from the A/C fanswitch to the J4

connector at pin 2and find the open.

Test 9. Do you haveignition voltage atthe EP3 Electrical

Center at J11 pin 5on the 20P wire?

Run tests on the EP3electrical center for

an open, bad fuse orrelay in the board.

Check for continuityon the 20P wire fromthe OE tie-in locationfor ignition voltage.

Yes

Yes

No

No

Start over.

Page 6I have ignitionVoltage on Connector

K1 Pin 3.

Test 10. Do youhave ignition voltage

at the K1 pin 5?

The Rear A/C boardhas an open from the

K1 pin 3 to the K1pin 5.

Replace the rear A/Cboard.

Test 11. Do youhave ignition voltage

at the K1 pin 4?

Test 12. Pull the A/Cthermo switch out ofthe dash and checkthe switch. Do you

have ignition voltageto the switch?

Go to page  7.

Go to page 6.

Check for an open inthe black/white wirefrom the K1 pin 5 to

the A/C thermoswitch.

Yes Yes

Yes

No No

No

Start over.

Page 7I have ignitionVoltage at the A/C

Thermo Switch

Test 13. Check theA/C Thermo Switch

for continuity, is theswitch good?

Replace the A/CThermo Switch.

Test 14. Check thewhite/blue wire from

the A/C ThermoSwitch to the K1 pin

4 for an open.

Repair the Open.

Yes

No

Start over.

Page 8I have ignitionvoltage at the K1 pin

4.

Test 15. Check forvoltage at the CL1relay at pin 85, do

you have voltage onpin 85?

Replace the rear A/Cboard.

Test 16. Check forground at the CL1relay at pin 86, doyou have ground?

Repair the Open inthe ground cable

from the frame railto the rear A/C

board.

Yes

No

Go to Page 9.

Test 17. Check K3pin 2 for a ground,

do you have aground?

No

Test 18. Check for aground on the big

ground stud marked(-), do you have a

ground?

No

Yes

Go to Page 11.

No

Yes

Yes Replace the rear A/Cboard.

Start over.

Page 9I have ground at theCL1 relay at pin 86.

Test 19 Check thefuse at F04. Is the

fuse good?

Replace the rear A/Cboard.

Test 23. Checkswitches in thecondenser for

continuity through allthe switches. Do you

have continuity?

No

Yes

No

Test 20. Check theCL1 relay at pin 30for voltage. Do youhave voltage on pin

30?

No

Replace CL1 relay.

Test 21. Check K2pin 2 for voltage. Doyou have voltage on

K2 pin 2?

No

Replace F04.

YesYes

Test 22. Check the03 blue wire at the

condenser forvoltage. Do you have

voltage?

Yes

No

Check the 03 bluewire from the K2 pin2 to the condenser

for an open andrepair.

Replace thefailed switch.

Yes Go to Page 9.

Start over.

Test 24. Check the03 blue wire from the

condenser to thecompressor. Do youhave voltage to the

compressor?

Yes

No

Check the 03 blue wire from thecondenser to the compressor, for an

open. Repair the open.

Page 10

Check and repair orreplace the compressor.

Yes I havecontinuity?

Start over.

Yes I have a groundat K3 pin 2

Test 25. Check for aground on K3 pin 3.

Do you have aground?

No

Page 11

Yes

Test 27. Check forcontinuity from K3pin 2 to Evaporatorswitch/switches. Do

you have continuity ?

No

Yes

Go to Page 8

Test 16.

Test 28. Check forcontinuity from theswitch/switches to

the K3 pin 3. Do youhave continuity ?

Replace the switch.Yes

Find the open andrepair.

Start over.

Test 32. Check the03 White wire for anopen from the C1R

stud to thecondenser.

Page 12I Do Not havecondenser fan

operation.

Test 29. Do youhave ignition voltage

at K1 pin 4?

NoTest 30. Check forvoltage at the C1Rstud. Do you have

voltage?

No

Test 31. Check the03 White wire for

continuity from theC1R stud to the

condenser. Do youhave continuity?

Yes

Start with Page 1and run tests up toTest 14 until you

have ignitionvoltage at the K1 pin

4.Replace the A/C

board.

Repair the open inthe 03 White wire.

No

Yes

Replace thecondenser fan motor.

Yes

Start over.

Page 13I Do Not haveevaporaror fan

operation.

Test 33.  Do youhave ignition voltageat K1 pins 1, 2, or 3?

Yes

No

Test 34. Whichelectrical panel doyou have above

mounted above thedrivers head, the EP2

or the EP3?

I have the EP3

I have the EP2

Go to page 4.

Go to page 3.

If you have the fan switch on low, you shouldhave voltage on K1 pin 3.

If you have the fan switch on medium, youshould have voltage on K1 pin 2.

If you have the fan switch on high you shouldhave voltage on K1 pin 1.

Do you have voltage in each pin at the correcttime?

Yes

No

Go to page 13.

Go to page 14.

Start over.

Page 14I Do Not havevoltage in each pinat the correct time?

Test 35.

Check continuity on the red/white wire from theA/C fan switch to K1 pin 3. Do you have

continuity?

—------------------------------------------

Check continuity on the yellow/white wire fromthe A/C fan switch to K1 pin 2. Do you have

continuity?

—------------------------------------------

Check continuity on the orange/white wire fromthe A/C fan switch to K1 pin 1. Do you have

continuity?Test 36. Which

electrical panel doyou have above

mounted above thedrivers head, the EP2

or the EP3?

I have the EP2 I have the EP3

Go to Page 3 Go to Page 4

Test 34. Do youhave ignition voltage

to the A/C fanYes

No

YesNo

Go to Page 12 andrun test 33

Replace or repair theopen.

Start over.

Page 15I have voltage ineach pin at thecorrect time?

Test 37.

When you have voltage on K1 pin 1, you shouldhave voltage at the HSR stud if fuse 01 and the

TCO fuse are good.

—------------------------------------------

When you have voltage on K1 pin 2, you shouldhave voltage at the pin 85 of the medium speed

relay if fuse 02 and the TCO fuse are good.

—------------------------------------------

When you have voltage on K1 pin 3, you shouldhave voltage at the pin 85 of the low speed relay

if fuse 03 and the TCO fuse are good.

—------------------------------------------

Are the conditions met?

No

Test 39.

Check for a groundon pin 86 on themedium and low

speed relays. Do youhave a ground on

both?Replace the rear A/C

board.

Replace the failedrelay.Yes

Test 38.

When you have voltage on at the HSR stud youshould have voltage on the orange wire going to

the evaporator motor.

—------------------------------------------

When you have voltage at pin 85 of the mediumspeed relay you should have voltage at the MSRstud and  voltage on the yellow wire going to the

evaporator motor.

—------------------------------------------

When you have voltage at pin 85 of the lowspeed relay you should have voltage at the K3pin 1 and  voltage on the red wire going to the

evaporator motor.

No

Yes

Start over.

Start over.

The EP2will usethe J1Pin3

The EP3will usethe J4Pin2

Page 15

-

DATE

TITLE:

MATERIAL SPEC:

PART NUMBER:

RELEASE #DESCRIPTIONBYREV.

DATE:

SCALE:

CKD:

SIZE:

WGT:

DRAWN:

DRAWING INFORMATION

FRACTIONAL:

DECIMALS:

ANGULAR:

± 1/16

0.00 ± 0.06

+ 1 DEG.

NEXT ASSEMBLY:

SUPERSEDES:

DO NOT SCALE DRAWING

MARK PART NUMBER AND REVISION ON ALL PARTS

1655B WALL STREETSALINA, KS 67401

REV. 01/04

RELEASED TO PRODUCTION PAGE:

TOLERANCE UNLESS SPECIFIEDTHIS DRAWING IS THE PROPERTY OF ELDORADO

NATIONAL COMPANY, A THOR INDUSTRIES COMPANY

AND IS NOT TO BE DUPLICATED OR USED IN ANY WAY

DETRIMENTAL TO THEIR BEST INTEREST.OF

JWW

NTS

B

ElDoradoElDoradoElDoradoElDoradoNationalNationalNationalNational

a THOR companya THOR companya THOR companya THOR company

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A/C SCHEMATIC, CARRIER/ACT/TA

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8/28/08

7/2/10

1/7/11

ADDED CRITICAL NOTE

CHNGD MED SPEED FUSE ON 0031539 TO 40A

MOVED CLUTCH TRIGGERS

ADDED THERMAL CUTOFFS

ADDED CRITICAL NOTE 2

13463

14750

15881

13198

JOH

s0031539

s0031539

2 2

HI

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WC

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1

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1

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N2

F01

F02

K21

2

3

4

K31

2

3

C2R1

C1R1

MSR1

HSR1

+++++1

-----1

F03

F04

F05

K11

2

3

4

5

D01

D0

2

D0

3

D04

EVAPORATOR

EVAPORATOR

AC FAN SWITCH

AC THERMO SWITCH

03 O/W

03 Y/W

03 R/W

03 O/W

03 Y/W

03 R/W

03 O/W

03 Y/W

03 R/W

GNDGND

02 W/B

02 W/B

03 K/W

03 K/W

02 K/W02 K/W

03 B03 B

03

B

03

B

03 W

03 W

03 P

03 E/W

L9001

2

3

4

03 E/W

03 P

03

P

03

P

ATTACHED TO

CONDENSER

MOUNTING BOLT

GND

GN

D

03 K

GND

ATTACHED TO

CONDENSER

MOUNTING BOLT

GN

D

03 K

O

Y

03 W/B

J11

2

3

4

5

O Y R B P

GN

D

O

Y

B

O Y R B P

GN

D

ATTACHED TO

DRIVER SIDE

FRAMERAIL

GND

AT

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F03

F04

F05

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3

4

5

D01

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2

D0

3

D04

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2

JP

1

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D0

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TCO

TCO

TCO

TCO

TCO

TCO

TCO

TCOEVAPORATOR

REAR AC CONTROL PANELFRONT AC CONTROL PANEL

SEE CHART PAGE 1

TO DETERMINE IF YOU

USE THIS COMPONENT

SEE CHART PAGE 1

TO DETERMINE IF YOU

USE THIS COMPONENT

SEE CHART PAGE 1

TO DETERMINE IF YOU

USE THIS COMPONENT

SEE DETAIL A & B

SHEET 1

PRIMARY

ELECTRICAL

POWER

CENTER

NOTES:

1. TERMINAL POSITIONS ON PRINTED CIRCUIT CARD ARE USING

SILK SCREEN MARKINGS AND NOT ACTUAL TERMINAL POSITIONS.

2. THERMAL CUTOFFS ARE LOCATED NEXT TO THE RELAY FOR BEST

PERFORMANCE. TCO'S ARE RATED AT <1 AMPS @ 171°F.

3. DIODES ARE RATED AT A MINIMUM OF 3 AMPS.

RED

RED

RED

RED

RED

YE

LLO

W

YE

LLO

WY

ELLO

W

80A

HARD

SOLDERED

80A

HARD

SOLDERED

80A

HARD

SOLDERED

40A

REMOVABLE

40A

REMOVABLE

40A

REMOVABLE

40A

REMOVABLE RED

RED

RED

RED

RED

YE

LLO

W

YE

LLO

W

YE

LLO

W

80A

HARD

SOLDERED

80A

HARD

SOLDERED

80A

HARD

SOLDERED

40A

REMOVABLE

40A

REMOVABLE

40A

REMOVABLE

40A

REMOVABLE

- CRITICAL CONTROL ITEM

1) TERMINALS C2R, C1R, MSR AND HSR

MUST BE TORQUED TO 2-4 FT. LBS.

POWER AND GROUND POSTS MUST

BE TORQUED TO 9-11 FT. LBS.

2) ADD BLUE LOCTITE E53554 ON ALL

BOLTS / SCREWS ON 0031539-0031539-5

AND THE AC BREAKER.

FOR DUAL CORE EVAP

THIS IS ONE SIDE ONLY.