Mishimoto MMHE-G80-21 User manual

INSTALLATION GUIDE
TABLE OF CONTENTS RESOURCES & CONTACT
CALL 1-877-GOMISHI
CUSTOMER SERVICE HOURS: MON–FRI 8:30AM–5:00PM EST
MISHIMOTO
GOMISHIMOTO
MISHIMOTO
WEBSITE
WWW.MISHIMOTO.COM
ENGINEERING BLOG
WWW.MISHIMOTO.COM/ENGINEERING
MISHIMOTO 7 BOULDEN CIRCLE, NEW CASTLE, DE 19720 P 1.877.GOMISHI WWW.MISHIMOTO.COM
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RESOURCES AND CONTACT INFORMATION
IMPORTANT SAFETY INFORMATION
REQUIRED TOOLS
INSTALLATION INSTRUCTIONS
DISPOSAL INSTRUCTIONS
WARRANTY INFORMATION
HEAT EXCHANGER FITS 2021+ BMW G8X M3/M4
SKU: MMHE-G80-21

Installation Guide | SKU: MMHE-G80-21 | 2021+ BMW G8X M3/M4 HEAT EXCHANGER 2
2021+ BMW G8X M3/M4
INTERCOOLER HEAT EXCHANGER
IMPORTANT SAFETY INFORMATION
& INSTALLATION INSTRUCTIONS
Continued on next page
IMPORTANT SAFETY INFORMATION
›Mishimoto recommends you use safety glasses and protective
gloves during the installation of our products
›Raise vehicle only on jack stands or on a vehicle lift
›Allow vehicle to cool completely prior to attempting installation
›Do not run the engine or drive the vehicle while overheating;
serious damage can occur
›Please dispose of any liquids properly
›Mishimoto is not responsible for any vehicle damage or
personal injury due to installation errors, misuse, or removal
of Mishimoto products
›If you need any assistance while installing our products,
reach out to our Customer Service Team at 1-877-GOMISHI
REQUIRED TOOLS
INSTALL TIME 2-3 HOURS
INSTALL DIFFICULTY
DISCLAIMERS
›This instruction manual is focused on installing a Mishimoto part
and may not comprehensively cover removal and reinstallation of
factory components
›Raise vehicle only on jack stands or a vehicle lift. Never use
only a jack.
›Allow vehicle to cool completely before attempting installation
›Do not run engine or drive vehicle while overheating, as serious
damage may occur.
›Please dispose of any liquids properly.
INSTALLATION INSTRUCTIONS
1. Remove the front spoiler and the front plastic undertray.
2. Remove the front bumper cover. Refer to the factory workshop

3. Remove the auxiliary cooling system reservoir cap to allow for
easy draining of the system.
T30 TORX KEY OR SOCKET
T40 TORX KEY OR SOCKET
10MM ¼” DRIVE SOCKET
¼” DRIVE RATCHETING WRENCH
13MM 3/8” DRIVE SOCKET
3/8” DRIVE RATCHETING WRENCH
10MM RATCHETING WRENCH
PICK TOOL(S)
SMALL PLASTIC CUTTING TOOL
2MM HEX KEY
3MM HEX KEY
FLUID CATCH PAN
VACUUM COOLANT FILL TOOL
(OPTIONAL)

LIQUID CHILL)

Installation Guide | SKU: MMHE-G80-21 | 2021+ BMW G8X M3/M4 HEAT EXCHANGER 3
Continued on next page
4. Using a pick tool, remove the clip holding the lower drivers side
heat exchanger hose to the port of the heat exchanger. Remove the
hose from this port, be prepared to catch the coolant that will be
coming from the port.
5. Remove the upper radiator cover bracket. Remove the 6x 13mm
bolt, 5x black T30 bolts, and 4x silver T40 bolts. Next, remove the
push pins from the front of the bracket. Once complete, remove
the hood latch cable from the tabs and remove the upper radiator
bracket from the vehicle.
6. Remove the 3x T30 screws holding the radiator cover and fan
shroud to the radiator assembly.
2021+ BMW G8X M3/M4
INTERCOOLER HEAT EXCHANGER
INSTALLATION INSTRUCTIONS

Installation Guide | SKU: MMHE-G80-21 | 2021+ BMW G8X M3/M4 HEAT EXCHANGER 4
Continued on next page
7. Unlatch the fan assembly by pushing this tab toward the rear of
the vehicle and pull up on the fan shroud enough to get the upper
radiator cover out from underneath it. Remove the upper radiator
cover. It may be necessary to use a pick tool to release this tab to
fully remove the cover.
8. Remove the upper heat exchanger hose by removing the clip and
pulling the hose away from the heat exchanger.
9. Remove the upper plastic rock guard.
10. Push in the clip/tab in the rectangle hole shown and pull up on
the factory heat exchanger to remove from the vehicle.
11. Remove the upper passenger side (LHD) rock guard tab
with a cutoff tool.
12. Install the Mishimoto heat exchanger into the vehicle. It may be
helpful to rotate the heat exchanger clockwise (facing the front of the
vehicle) in order to get the lower outlet into its spot in the radiator
support plastic.
2021+ BMW G8X M3/M4
INTERCOOLER HEAT EXCHANGER
INSTALLATION INSTRUCTIONS

Installation Guide | SKU: MMHE-G80-21 | 2021+ BMW G8X M3/M4 HEAT EXCHANGER 5
Continued on next page
13. Take the small bracket and included M5 screw and install onto
the machined piece under the inlet of the heat exchanger. Secure the
M5 screw with a 3mm hex key/socket.
14. Install both the inlet and outlet hoses on the Mishimoto
heat exchanger. You should hear an audible click when they
are fully seated.
15. Lower the included rock guard into the vehicle between the
radiator shroud and the heat exchanger into the 4 L-brackets
welded to the radiator. Secure the rock guard with the 4 included set
screws and a 2mm hex key. We suggest putting a small amount of
threadlocker on the set screws to prevent them from backing out.
16. (Manual vehicles only) Remove the T30 screw securing the
factory lower rock guard to the vehicle and remove from the vehicle.
Install the included lower rock guard with the factory screw.
17. Using the same method as the removal, lift the fan shroud
slightly and install the upper radiator cover back onto the radiator
assembly. Reinstall the 3x T30 Torx screws.
18. Reinstall the upper radiator bracket. Remember to reinstall the
hood latch cable in its proper location to ensure that the hood will
open properly.
19. Reinstall the front bumper cover.
20. 
coolant or Mishimoto liquid chill. Make sure to check for any leaks

21. Reinstall the factory plastic undertray and spoiler.
22. Perform the factory coolant vent/bleed procedure for the
auxiliary system. Close both cooling system reservoir caps. With the
hood open, headlights on, and battery connected to a charger, turn
the vehicle on but NOT the engine. Turn the heat to max temp and

seconds without touching the brake pedal. This should activate the
auxiliary cooling system venting procedure which will take about 11
minutes. A message with “service function started” will display on
the dashboard. Once complete, top off the system if necessary.
Congratulations! You have nished your installation!
2021+ BMW G8X M3/M4
INTERCOOLER HEAT EXCHANGER
INSTALLATION INSTRUCTIONS

Installation Guide | SKU: MMHE-G80-21 | 2021+ BMW G8X M3/M4 HEAT EXCHANGER 6
2021+ BMW G8X M3/M4
INTERCOOLER HEAT EXCHANGER
DISPOSAL INSTRUCTIONS &
WARRANTY INFORMATION
DISPOSAL INSTRUCTIONS
›Do not dispose of any product as unsorted municipal waste.
Use separate collection facilities. Contact your local authority
for information regarding the collection systems available.
›Never improperly dispose of any coolant, oil, or other chemicals.
WARRANTY INFORMATION
›All claims must be accompanied with
a picture of the Mishimoto product
showing the issue for which the claim
is being submitted.
›Mishimoto asks that the customer
inspect their purchased item for any
damage immediately upon arrival.
›Any product deemed dead on arrival (DOA) must be claimed within
14 business days of delivery. Claims outside of this time frame will
not be covered under the Mishimoto Lifetime Warranty.
›This warranty does not include payment and/or reimbursement
of the cost of labor in connection with the removal of any product
returned pursuant to the warranty policy or in connection with
the installation of any replacement items provided under the
warranty policy.
›Mishimoto has the right to refuse a claim at any time.
›When Mishimoto accepts a claim, Mishimoto retains full
discretion to choose if it will: (i) repair or replace purchaser’s
original Mishimoto product; (ii) replace purchaser’s original
Mishimoto product with the most current available model;
or (iii) provide the purchaser with a gift card redeemable on
Mishimoto.com in the amount of the original purchase price of
the original Mishimoto product. The provision of a replacement
of a Mishimoto product is subject to availability and Mishimoto
retains the right to substitute any warranty claim item with
a comparable item or credit at any time.
›If Mishimoto determines that it will provide a replacement item
in connection with a claim under this warranty policy, and such
item is out of stock, Mishimoto will place the customer on
backorder and ship the replacement product to the purchaser
once it becomes available.
›Mishimoto is not liable for incorrect shipments in connection
with a claim if a claim form is completed incorrectly, or if a model
number is not included in a claim.
›If you have a vehicle equipped with an automatic transmission,
please make sure to specify this within the text box on the claim
form. Mishimoto is not responsible for incorrect replacement
shipments if transmission type is not indicated.
This product can expose you to chemicals which are known to
the state of California to cause cancer. For more information
visit: www.p65warnings.ca.gov