Honda Bmw 5 Service Manual

Radiator and Cooling System 
Remove  rubber trim  strip between  top of shroud and  radiator. 
Using 32  mm wrench 
(BMW special tool 11 5 040)  on fan 
clutch  nut (arrow),  turn wrench  in a clockwise  direction 
(working  from front  of car) while counterholding  pulley with 
BMW  special tool 
11 5 030. Spin  fan off coolant  pump. 
NOTE- 
The radiator cooling  fan nut (32 mm wrench)  has left-hand 
threads. 
Unclip  AUC (air quality) sensor from  shroud, 
M54 engine:  Disconnect auxiliary coolant...

170-1 6 
I Radiator and Cooling System 
- Remove  fan and  fan shroud mounting  fasteners. Slide fan 
and  fan shroud downward  to  remove. 
- Reinstallation is reverse of removal. 
Thermostat, removing and installing 
(M52 engine) 
The coolant  thermostat is  installed in a housing at  the front  of 
the engine. 
- Drain coolant from radiator and engine  block. See Coolant, 
draining and  filling (6-cylinder  models). 
WARNING - 
Allow the  cooling system  to cool  before opening  or draining 
the...

Radiator and Cooling systeml 
Tightening torques 
Block  drain plug to block  25  Nm 
(18 
it-lb) 
Coolant  hose clamp  (32 - 48  2. 
5 Nm (22 in-lb) 
mm  hose  diameter) 
Radiator drain  plug to radiator 
2-3Nm(l8-27in-lb) 
Thermostat housing  to cylinder 
head 10 Nm (89 in-lb) 
I Coolant  thermostat  housing assmbly- - I 
Thermostat,  removing and installing 
(M52 TU or M54 engine) 
4 The  electric  map-controlled thermostat  is  part of the  thermo- 
stat housing  at the  front  of the  cylinder...

Tightening torques Block  drain plug to block 
25 Nm  (18 ft-lb) 
Radiator drain plug  to radiator 2 - 3 Nm  (18 - 27 in-lb) 
Thermostat housing to 
cylinder  head 10 Nm (89 in-lb) 
Thermostat, removing and installing 
(V-8 models) 
The electrically-heated thermostat is  an integral parl of the 
thermostat housing.  The operation  of the thermostat is  moni- 
tored  by the  engine  control  module (ECM). 
- If a faulty  thermostat  is suspected,  use appropriate scan tool 
to  interrogate  ECM for...

170-1 9 
Radiator and Cooling System 
Coolant pump  Remove thermostat housing fasteners 
(arrows) and remove 
thermostat  housing. 
Installation is  reverse of removal,  noting the  following: 
- Keep sealing  faces clean and free  of  oil. 
Use  new  sealing  gasket. 
Fill system with  coolant. See Coolant,  draining and fill- 
ing 
(V-8 models). 
Tightening  torques 
Block  drain plug to block  25 Nm  (18 it-lb) 
Coolant hose  clamp (32 
- 48 2. 5 Nm (22 in-lb) 
mm  hose  diameter) 
Radiator drain...

., -- 
Radiator and Cooling System --- 1 
insert two M6 screws  (arrows)  in tapped bores  and tighten 
uniformly until  pump is free from timing chain cover (thermo- 
stat  and  hoses have  been removed  for purposes of  visual 
clarity). 
Installation  is reverse  of removal, noting  the following: 
Be  sure  to replace sealing O-ring  and gaskets. 
Coat  O-ring  with water-based  lubricant  during installation. 
Refill with coolant.  See Coolant,  draining and filling 
(6- 
cylinder models)....

Radiator and Coolina ~vsteml 
- Disconnect thermostat  and cooling  system temperature sen- 
sor plug connectors. 
4 Remove  thermostat housing  fasteners and remove housing. 
- Remove coolant pump pulley  bolts and remove  pulley from 
pump. 
Remove  fasteners A and B (arrows). 
NOTE- 
* The coolant  pump is retained  to the block using different 
length  bolts. 
0 Bolts A: M6 X 105 mm 
0 Bolts 8: M6 X 35 mm 
Slide coolant pump  away from coolant pipes  (arrows) while 
being careful  not to dislodge...

.. - -- 
Radiator and Cooling System 
Tightening torques 
Coolant pump to timing  chain  10 
Nm  (89 in-lb) 
cover 
Coolant pump 
pulley to  coolant 
pump 
10  Nm  (89 in-lb 
Engine 
blocic drain  plug to  block 25 Nm (18 ft-lb) 
Radiator drain  plug to radiator 
2-3Nm(18-27in-lb) 
Thermostat cover  to coolant 
pump assembly 10 Nm  (89 in-lb) 
Radiator,  removing and  installing 
Removal of the  radiator  is similar for V-8 and  6-cylinder  mod- 
els. 
- Raise  front of car  and  support  safely....

. -- 
Radiator and Cooling system/ 
4 Pry out expansion  rivets (A) on left  and  right side  of  fan 
shroud.  Loosen  hose clamp 
(6) and remove hose from  ex- 
pansion  tank. 
Remove expansion tank:  Remove expansion  tanlc cap, vent  plug 
(A) and tank retain- 
ing  clips  (arrows). 
Lift expansion 
tanlc upward and  off lower retaining lugs. 
Push  shroud  back to expose expansion  tank vent line. Re- 
move line. 
Using  32 mm  wrench 
(BMW special  tool 11 5 040) on fan 
clutch nut  (arrow), turn...

-- 
Radiator and Cooling System 1 
4 Lift fan and  shroud together out  of engine compartment. 
- Detach  upper and  lower radiator  hoses. 
NOTE - 
Later models use retaining  clips to fasten  coolant hoses  to 
expansion  tank and radiator. 
- Disconnect  temperature  sensor harness  connector. 
4 Remove radiator  support bolts and  supports (arrows).  6-cyl- 
inder  shown. 
- Slide  right side  of radiator back toward engine  and pull radi- 
ator  up to remove. 
- Installation  is reverse  of...