Jump to content

Welcome to Autoworld Forum !

Sign In or Register to gain full access to our forums. By registering with us, you'll be able to discuss, share and private message with other members of our community.

Close
Photo

Engine temperature & FC for 850 T5


  • Please log in to reply

#11
kenari1

Posted 18 February 2005 - 12:18 AM

kenari1

    Taxi Driver

  • Members
  • PipPip
  • 435 posts
my temp sticks to the center mark most of time even when idle in traffic or
in high speed drives.

as for the fc, more or less as described.

i have noticed a slight reduction in coolant levels after 1 year but it
could the leak i found just above the turbo heat shield. there is a little
hose that link the coolant to the turbine cooling system and this bit has
hardened. will be replacing this soon.

#12
vol940

Posted 18 February 2005 - 01:38 AM

vol940

    Taxi Driver

  • Members
  • PipPip
  • 372 posts
Hi guys,

Please check your thermostat rating !!!!!
If I am not mistaken the rating is at 87 deg.C

During warm-up this thermostat closed (no coolant circulation), when
reach at 87 deg. C (needle at the midle of scale, volvo 940 at 12
o`clock, 850 at 3 o`clock), thermostat open to allow coolant circulate to
radiator and back to engine.

If needle indicates less than 3 o`clock (2.30 o`clock for example),
thermostat not fully open (clogged).....need to be changed.

#13
glock19

Posted 18 February 2005 - 08:28 AM

glock19

    Tokyo Drifter

  • Members
  • PipPipPip
  • 3,274 posts
If the thermostat needs changing, you can all DIY, very easy. No need to
open engine of whatever, just on the left of the cam cover but make sure
you have the gasket/sealant ready (if needed) and the thermostat of course.

#14
vol940

Posted 18 February 2005 - 08:33 PM

vol940

    Taxi Driver

  • Members
  • PipPip
  • 372 posts
sillycar,

Considering that your FC is pretty good, nothing happen to your
temperature gauge. It is only a heat transfer balance function to ambient
temperature and quantity heat to be removed from engine.

If the needle is excessively increasing closed to red mark than you
consider your thermostat. But if only slightly obove the scale, don't
worry lah. Mine also like that on 940 or rx300....yeah depending on
outside temperature and engine speed.Cool



#15
russ

Posted 21 February 2005 - 11:58 AM

russ

    Probation

  • Members
  • Pip
  • 23 posts
my temp is a wee bit above centre. I think when i first bought the car
temp was at dead centre. OBDI indicate problem with low speed fan
cooling. been quoted RM 900 for an oem/bosch unit. Is that a reasonable
price? Or can part of the fan unit be repaired i.e. relays etc.

regards

#16
cap48

Posted 21 February 2005 - 03:12 PM

cap48

    Road Warrior

  • Members
  • PipPip
  • 692 posts
russ, the ori fans already come with relays. It's a good idea to check
these first. You never know. The price RM900-00 quoted includes
workmanship or not? If, included, it's reasonable. With regard to repair,
I was told you can't as the whole unit comes sealed for life! Maybe, some
of the other sifus/gurus can comment.

#17
vol940

Posted 22 February 2005 - 01:27 AM

vol940

    Taxi Driver

  • Members
  • PipPip
  • 372 posts
russ,

"OBDI indicates problem with low speed fan cooling".

So, one think to check is the fan clutch. Fan is supposed to speed up at
a rate that is non-linear with the engine speed (i.e., the higher the
engine speed, the less of an increment in fan speed for each additional
rpm of engine speed.) The way they handle this (at least on some models)
is to have a fan clutch that is slips a bit as the fan moves faster. When
the clutch wears out, it slips too much, the fan slows down, and the
engine will tend to overheat - particularly when it's warm out or the
engine is under stress.

Other solution is, you change your thermostat rating to lower one. The
most volvo use 87 deg.C thermostat rating, check yours first. If 87 deg.
C, then change to 81 deg. C rating.

#18
cap48

Posted 22 February 2005 - 11:04 AM

cap48

    Road Warrior

  • Members
  • PipPip
  • 692 posts
vol940, what you've described sounds like these "thermo-coupled" fans
which may be or are diffrent from the electric fans installed on the
850's. Am I wrong?Shy

#19
russ

Posted 22 February 2005 - 02:03 PM

russ

    Probation

  • Members
  • Pip
  • 23 posts
i think 850 cooling fans are fully electric rather than "viscous / thermo
coupled". BTW a spare part shop in chan sow lin quoted me RM680 for a
bosch unit. Their price is aleast 20% lower than from my mech in Ampang.

For comparison, brake switch RM 450 vs RM 350, Oilcooler hose (top n
Bottom) RM680 vs RM 550.

regards

#20
vol940

Posted 22 February 2005 - 03:20 PM

vol940

    Taxi Driver

  • Members
  • PipPip
  • 372 posts
cap48,

You are not wrong, I just rely the low speed cooling fan and the type of
cooling fan which normally occurs independently with models of vehicles.

For electric fan type, two possibilities may occur : Not enough current
or coil dah kaput.....time to change the fan.

-------------------------------------------

russ,

Did you observe your temperature gauge when you drive at high speed, let
say at 120 km/h ?. Coz fan is irrelevant problem at high speed, means
that excessive engine heat removed by high air speed entering to the
engine compartment. This fan is used when idling or when you switch-on
the air cond. So Air cond will bypass the thermostatic switch on and off.