Water pump not flowing well at idle?
#11
05-28-2010 | 03:24 PM
Three Wheeling
Joined: Apr 2010
Posts: 69
Likes: 0
From: queens, NY
ok, here is what i found on RAVE workshop manual... there is a table on RAVE page 04-10
hope it might help...
hope it might help...
Cooling system - V8
Type:
Pressurised, spill return, thermostatically controlled water and antifreeze mixture. Vertical flow radiator with remote header tank and pump assisted
Type:
Pressurised, spill return, thermostatically controlled water and antifreeze mixture. Vertical flow radiator with remote header tank and pump assisted
Cooling fans:
9 blade axial flow on viscous coupling and 11 blade axial flow electric Electric cooling fan switching points:
9 blade axial flow on viscous coupling and 11 blade axial flow electric Electric cooling fan switching points:
For A/C system:
On When vehicle speed is 50 mph (80 km/h) or less and ambient temperature is 28 °C (82 °F) or more
Coolant pump output at 1000 rev/min 10 litres/min (2.64 US galls/min) at 0.7 bar (10 lbf.in2)
Off When vehicle speed increases to (62.5 mph (100 km/h) or ambient temperature decreases to 25 °C (77 °F)
For engine cooling during normal running:
On 100 °C (212 °F)
Off 94.5 °C (202 °F)
For engine cooling at ignition off (to counteract heat soak):
On If, within 10 seconds of ignition off, intake air temperature is 60 °C (140°F) or more and engine coolant temperature is 110 °C (230 °F) or more
Off After 10 minutes or if engine coolant temperature decreases to 100 °C (212 °F)
Coolant pump Centrifugal impeller, belt driven from crankshaft
Coolant pump drive ratio 1.293 : 1
Coolant pump output at 1000 rev/min 10 litres/min (2.64 US galls/min) at 0.7 bar (10 lbf.in2)
Thermostat
Waxstat with pressure relief valve
Waxstat with pressure relief valve
Thermostat operating temperature:
Initial opening 82 °C (179 °F)
Fully open 96 °C (204 °F)
Expansion tank cap relief valve - system operating pressure
1.4 bar (20 lbf.in2)
1.4 bar (20 lbf.in2)
Last edited by xhevi; 05-28-2010 at 03:27 PM.
#12
05-28-2010 | 08:59 PM
Super Moderator
Joined: Aug 2008
Posts: 1,174
Likes: 106
From: Middle of Caribbean
So what does this all mean?
Plain and simple... the design of the DII cooling system is that of which the idle speed of the water pump isn't sufficient enough to allow full flow of coolant through the radiator.
That is why when you guys rev the motor, or are driving, the temp drops.
BUT if you have bad cooling system components (clogged radiator, air in the system, bad water pump etc..) it will just over heat faster during idle.
Plain and simple... the design of the DII cooling system is that of which the idle speed of the water pump isn't sufficient enough to allow full flow of coolant through the radiator.
That is why when you guys rev the motor, or are driving, the temp drops.
BUT if you have bad cooling system components (clogged radiator, air in the system, bad water pump etc..) it will just over heat faster during idle.
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