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INSTALLATION & OWNER’S MANUAL
Manual p/n: IM-9PH20S56
Rev. D (7/20/2017)
BEFORE YOU START
HELPFUL REMINDERS:
Read and understand all instructions before beginning.
Approximate installation time: 3-4 Hours
TOOLS REQUIRED:
Drill 8mm Socket and Ratchet
2 1/2” Hole Saw 5/32” Allen Wrench or Driver
2 1/16” Hole Saw 5/16” Nut Driver or Flat Screwdriver
1” Hole Saw or step bit #2 Phillips Screwdriver
1/8” Dia. Drill Snips
1/4” Dia. Drill Drain Pan
3/8” Dia. Drill Saw (to cut through plastic dashboard)
SAFETY INFORMATION:
! WARNING: Serious injury or death:
Lift only one end of the vehicle at a time. Use a suitable lifting device (chain hoist or
hydraulic floor jack) with 1500 lb. (681 kg) minimum lifting capacity. Do not use lifting
device to hold vehicle in raised position. Use approved jack stands of proper weight
capacity to support the vehicle and chock the wheels that remain on the floor. Lock the
brakes.
! WARNING: Serious injury or death:
Hot! Do not attempt to service hot engine, exhaust system, or motor. Failure to heed
this warning could result in severe burns.
! WARNING: Damage to vehicle:
When drilling, always check behind hole locations for clearance and secure any wires
etc. out of the way before drilling holes.
The contents of this manual are the property of the owner.
Be sure to leave with the owner when installation is complete.
YAMAHA VIKING
HEATER KIT
p/n: 9PH20S56
(fits Yanmar Bull and Yanmar
Longhorn model years 2017-)
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FIGURE 1.2 (Under dash Vent Location)
FIGURE 1.1 (Dash Vent Location)
STEP 1:
1. Drill two (2) 2-1/2” holes in the dashboard of the vehicle as shown in Figure 1.1. (Note: if the
cab is installed, disconnect the latches and prop the windshield open for easier access)
2. Drill one (1) 2 1/16” hole in the underside of driver’s side of the dashboard as shown in Figure
1.2.
3. Using Fan Mounting plate as a template, place it under the driver’s side dashboard of the
vehicle as show in Figure 1.3 (make sure point on mounting plate follows contour on
underside of dashboard).
4. Mark off the four (4) fan holes and the four mounting holes on the under side of the dash, per
Figure 1.4.
5. Drill the eight (8) holes with a 1/8” drill then using a 3/8” drill open up the four mounting holes.
6. Drill the four fan holes with a 1” dia drill.
7. Scribe a line on the outside edges of these four holes to make a rectangle, per Figure 1.4.
8. Cut along the four scribed lines and make an opening in the dash for the fan.
VEHICLE PREP
FIGURE 1.3 (Fan to be installed later) FIGURE 1.4
2
1
/
2
” Dia.
2
1
/
16
” Dia.
Cut Lines
Point
Point
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STEP 2: HEATER HOSES
Note: Use Figure 2.1 as a guide for the following steps
1. Cut two 3” lengths of 5/8” heater hose and install them on the heater core nipples. Secure
with 1” hose clamps.
2. Install 90⁰ fittings onto the previously installed heater hose lengths. Orient as shown in
Figure 2.1, secure each with 1” hose clamps.
3. Cut two 7” lengths of 5/8” heater hose, install each onto the 90⁰ fittings and secure with 1”
hose clamps.
4. Install bleeder valves on the end of each 7” length of heater hose and secure each with 1”
hose clamps. Slip an 18 inch long, nylon protective sleeving over each bleeder valve and
slide the sleeving down to the heater box. This is to protect each exposed hose from the
heater box to the bleeder valves. Secure with cable ties at each end of the sleeving.
5. Cut a 25” length of heater hose and attach it to the bleeder valve on the driver’s side nipple.
Secure with a 1” hose clamp.
6. Install a 7/8” x 7/8” x 5/8” metal tee fitting onto the end of the 25” hose. Install a 1” hose
clamp, but do not tighten yet.
7. Cut a 7” piece of heater hose and attach to the bleeder valve on the passenger’s side nipple.
Secure with a 1” hose clamp.
8. Install the shut-off valve onto the end of the other 7” length of heater hose and secure with a
1” hose clamp.
9. Cut a 38” length of 5/8” heater hose and install it onto the shut-off valve. Secure with a 1”
hose clamp.
10. Install a 7/8” x 7/8” x 5/8” metal tee fitting onto the end of the 38” hose and install a 1” hose
clamp, but don’t tighten yet.
11. Put the heater box into position under the dashboard and feed the longer hose over to the
passenger side of the vehicle. The hose should pass over the radiator fan.
FIGURE 2.1 (Heater hoses)
Driver’s Side
90 Degree Fitting
25” long
Hose
38” long
Hose
Bleeder
Valves
Passenger’s
Side Shut-Off
Valve
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STEP 3: DRAIN COOLANT
1. Make sure engine is completely cooled down
before draining the cooling system.
2. Engage the parking brake, raise front of
vehicle, and support on jack stands. Caution:
see warning on page 1!
3. Remove the drain bolt from the underside
right rear passenger side of the vehicle with
an 8mm socket. See figures 3.3a and 3.3b.
4. Drain the cooling system into a drain pan and
replace the drain bolt.
5. With the front of the vehicle off the ground,
remove the driver’s side front wheel for easier
access during assembly.
6. Per figure 3.6, find the radiator hose coming
out of the driver’s side of radiator.
7. Cut the driver’s side radiator hose 4” from the
radiator and install the T-fitting, securing with
1-1/4” hose clamps. Tighten the hose clamp
on the 5/8” hose as well.
8. Per Figure 3.8, cut the passenger’s side
radiator hose 2” from the radiator and install
the second metal tee fitting, securing with
1-1/4” hose clamps. Tighten the hose clamp
on the 5/8” hose as well.
9. Be sure the hoses are free of kinks.
FIGURE 3.6 (driver’s side tee fitting)
FIGURE 3.8 (passenger’s side tee fitting)
Tee Fitting
Tee Fitting
FIGURE 3.3a (Approx. location of drain)
FIGURE 3.3b (Drain bolt)
Approx. location of drain
Drain bolt location
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STEP 4: REFILL AND BLEED SYSTEM
1. Make sure that coolant drain plug is in place and tight
2. Refill the cooling system with drained coolant at the radiator cap. Confirm that the in-line shut-
off valve is open. Confirm that the bleeder valves are both cracked open while topping off the
radiator with a 50/50 coolant – antifreeze mix.
3. Tilt the rear of the heater box towards the ground, so that the nipples aim up, as you refill the
coolant system. Once coolant starts to flow from bleeder, close them off.
4. Top off radiator with a 50/50 coolant – antifreeze mix.
5. Crack open the bleed screw on the engine as shown in Figure 4.5. Close screw as soon as
air is clear and coolant begins to flow out.
6. Install the radiator cap. Start engine and check system for leaks. If the temp indicator on the
dashboard illuminates while running the vehicle, shut the vehicle off immediately to
prevent engine damage. Run the engine at full throttle. Allow engine to warm up until
thermostat opens. Check the temperature of the heater hoses. If one of the heater hoses is
cooler than the other, shut the engine off and continue with step 7. If the heater is functioning
properly, proceed to next page.
7. Allow the system to cool and then open the bleed screw on the engine as shown in Figure 4.5.
Shake the heater box with the nipple pointing upward and open the bleeders on the heater
lines to eliminate any additional trapped air. Check the coolant level in the radiator and repeat
step 6.
FIGURE 4.5
Bleed Screw
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STEP 5: HEATER SWITCH WIRING
1. Drill one (1) 3/8” hole in the dashboard of vehicle as shown in Figure 3.1 next to the steering
column for heater switch.
2. Connect the ring terminals on the supplied wire harness to the respective red (positive) and
black (negative) terminals on the battery posts under the hood of the vehicle.
3. Run the harness out of the battery compartment and over to the driver’s side of the vehicle.
4. Route the harness along the driver’s side round vehicle tube frame. Locate the switch and
connect red wire to terminal B, per Figure 3.4
5. With the fan inside the cab, run the fan wire harness from the fan up along the left side wall of
the cab, through the opening where the wall and dashboard meet and out under the dash.
6. Connect the red wire from the fan to terminal H and the yellow to terminal L, per Figure 3.4.
7. Connect the black wire from the fan to the black wire on the fuse harness
8. Install the switch into drilled hole, secure with the nut and install the knob.
9. Test fan operation. Be sure to keep fingers away from moving fan parts.
FIGURE 3.1
FIGURE 3.4 (Wire harness)
Drill
3
/
8
” hole here
Run fan wires up here
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FIGURE 6.4
FIGURE 6.11
STEP 6: DUCTS
1. Allow heater components to cool
2. Attach a 2
1
/
2
foot length of vent hose to one of the right angle vents and secure with a cable
tie.
3. Position the vent under the passenger’s side hole cut in the dashboard with the hose routed to
the driver’s side.
4. Remove the twistable louver from its threaded trim ring, per Figure 6.4.
5. From the inside of the cab, install the trim ring into the hole and thread into the right angle
vent.
6. Attach a 2 foot length of vent hose to the other right angle vent and secure with a cable tie.
7. Position the vent under the driver’s side hole cut in the dashboard, with the hose routed to the
driver’s side.
8. Remove the twistable louver from its threaded trim ring.
9. From the inside of the cab, install the trim ring into the hole and thread into the right angle
vent.
10. Once vents are tight, reinstall louvers.
11. Remove the adjustable louver from its trim ring as shown in Figure 6.11.
12. Position the trim ring in the hole on the underside of the dashboard.
13. Fasten with four (4) self drilling flat head screws.
14. Snap the louver back into place.
15. Connect a 1
1
/
2
foot length of vent hose to the back of this vent and secure with a cable tie.
16. Position the heater box up into the approximate location to be mounted.
17. Install the flexible vent ducts over the (3) vent outlets on the heater core box.
18. Make sure that the flexible vent ducts are not kinked and have as few turns as possible. Wire
tie them to the heater core assembly outlets.
Vent
Trim Ring
Louver
Trim Ring
Louver
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FIGURE 7.1
FIGURE 7.3
STEP 7: HEATER BOX ASSEMBLY AND FAN
1. Install the heater box oriented as shown in fig. 7.1, such that threaded inserts in the bottom of the box
align with the four (4) drilled holes.
2. Place the fan mounting bracket on the underside of the dash, orient so that the weldnuts are on top in
the hole in the dashboard and install the four 1/4-20 button head screws.
3. Place the fan assembly up against the fan mounting bracket as shown in fig. 7.3 and attach with the
four #8 screws provided, oriented so that the wire is on the passenger side.
4. Secure wires and hoses with wire ties provided. CAUTION! Make sure wires and hoses are secured
away from moving parts and hot exhaust components. Pay extra attention to front wheel area,
making sure the wires and hoses clear steering and suspension components in all positions.
5. Make sure all hose clamps are tight and all bleeders are closed as well.
STEP 8: VINYL DRAFT BARRIERS
1. Install the large vinyl draft barrier under the center seat, per Figures 8.1. Begin by doing a dry fit to get
a feel for where all areas fit best. Make sure the areas where the supplied self-adhesive hook Velcro
will be applied are clean and dry and at room temperature for best adhesion. Apply the corresponding
Velcro where deemed necessary and to match the Velcro on the vinyl filler.
2. Drill four 1/4” holes through the plastic under the seat using the punched holes in the vinyl as a
template. Check clearance under the plastic before drilling.
3. Secure with four pine tree plugs
4. If the storage bin accessory is not installed under the driver’s seat, orient the small vinyl filler in the
rectangular opening under the seat and drill four 1/4” holes through the plastic using the vinyl as a
template.
5. Secure with four pine tree plugs.
FOR WARM WEATHER USE:
1. Shut off the valve to keep excess heat from entering the cabin. With the valve shut, the heater can still
be used to defog the windshield or circulate air inside of the cabin.
FIGURE 8.1
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YAMAHA VIKING HEATER SERVICE PARTS
REF.NO.SERVICEP/N: QTY/SVCKIT DESCRIPTION:
1 8SV‐9PH20U3‐B4 1 HEATERBOX
2 9PH20‐550C 1 HEATERCORE
3 8SV‐VKVWHF 1 HEATERFANASSEMBLY
4 9HR0078 1 7/8"X7/8"X5/8"TEE
5 9SV‐9PH20S30P6 1 BLEEDERVALVE5/8"
6 9HR0039 1 5/8"BARBEDELBOW
7 9HR0044 1 5/8"IN‐LINESHUTOFFVA LVE
8 9SV‐HRH13‐15 1 2"VENTHOSE(6FT.)
9 1HAP1D 1 2"VENT
10 9SV‐VKVWWH 1 VIKINGWIREHARNESS‐VEHICLESIDE
11 9SV‐9HR0046 1 SWITCH,ROTARYWITHKNOB(OFF‐LOW‐HIGH)
12 9SV‐9HR0073 1 RIGHTANGLEVENTWITHLOUVER
13 8SV‐VKFUSA 1 VINYLFILLERASSEMBLYUNDERSEAT
14 8SV‐VKVFSBC 1 VINYLFILLERSTORAGEBINCOVER
15 NA 1 VELCRO5/8"HOOKP.S.A.(109")
16 NA 1 FANMOUNTINGBRACKET
17 NA 1 HEATERHOSE(8.)
18 NA 14 1"HOSECLAMP(#10)
19 NA 4 1‐1/4"HOSECLAMP(#12)
20 NA 1 HARDWAREKIT,HEATER
21 IM‐9PH20S56 1 INSTRUCTIONMANUAL
22 NA 2 NYLONSLEEVING,HEATERHOSEPROTECTION
