Overheating
06-23-2005, 10:36 PM
#1
Junior Member
Thread Starter
Join Date: May 2005
Posts: 19
some help please,my temp gauge does not stay at 1/4 always at 1/2 and 3/4 on the gauge .it does this in stop and go traffic ,on the high way it seems to be okay a little above 1/4 .i just replaced the thermastat with oem 1 and still does the same.ther car runs fine and no smoke ,i have coolant in there and it does not boil over.1 pic i posted has a sensor it looks like it has a small crack but it is not leaking could this be the problem .and is there anyway i can tell if my fan is operating properly.oh bye the way in the pic it is not leaking from the cap ,i over filled and it dripped down, the cap is new .
06-24-2005, 09:58 AM
#6
Senior Member
Join Date: Oct 2003
Location: Canada
Posts: 3,502
No but if he uses a NON OEM thermostat he will have overheat problems regardless
It's been tested that auto part store replacement thermostats don't function the same as OEM thermostats
ALWAYS goto the dealer for your thermostat, I don't care who you are.
Try it and come back
It's been tested that auto part store replacement thermostats don't function the same as OEM thermostats
ALWAYS goto the dealer for your thermostat, I don't care who you are.
Try it and come back
06-24-2005, 01:07 PM
#7
Senior Member
Join Date: Feb 2004
Location: Orange Park FL
Posts: 363
Here's the deal:
A few years ago I had a bad fan clutch, so I did some exploratory surgery on it:
The fan clutch uses a silicon oil viscous fluid in two chambers inside.
A Bi-metal strip on the front bends outward as it warms and opens the valve from the reservoir side to the clutch side.
Centripetal force provides the pumping action to move the fluid.
When it sits for a few hours, it will spin the fan briefly on startup, then freewheel.
After 100,000 miles the bearing seals inside wear, and the bearing lube starts to weaken the clutch fluid's grip.
Both the S4 & S5 clutch freewheel when cold.
The s4 clutch increases it's bite gradually with temperature rise.
The s5 clutch is more on-off. (It just coasts until is gets warm)
Once they are warm, the fan speed goes up with engine speed to about 4000 RPM.
As the engine revs higher the fan stays at ~4K.
If your warmed up fan only revs up to < 2500 RPM, it's worn out.
A few years ago I had a bad fan clutch, so I did some exploratory surgery on it:
The fan clutch uses a silicon oil viscous fluid in two chambers inside.
A Bi-metal strip on the front bends outward as it warms and opens the valve from the reservoir side to the clutch side.
Centripetal force provides the pumping action to move the fluid.
When it sits for a few hours, it will spin the fan briefly on startup, then freewheel.
After 100,000 miles the bearing seals inside wear, and the bearing lube starts to weaken the clutch fluid's grip.
Both the S4 & S5 clutch freewheel when cold.
The s4 clutch increases it's bite gradually with temperature rise.
The s5 clutch is more on-off. (It just coasts until is gets warm)
Once they are warm, the fan speed goes up with engine speed to about 4000 RPM.
As the engine revs higher the fan stays at ~4K.
If your warmed up fan only revs up to < 2500 RPM, it's worn out.
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