Help - My car is overheating SLOWLY ...
#16
10-08-2007, 10:22 PM
Not difficult. Drain some coolant from the bottom of the engine using the plug on the center back of the engine, disconnect 1 end of 2 small hoses on thermostat housing and pump, remove 4 10mm bolts and remove housing. Gasket may remain intact but I use a coating of liquid gasket when I put the housing back on. Pour drained coolant through a coffee filter and pour it back into the engine.
Thermostat is rated at 83C. Running without the thermostat on the 3.4 engine increases the coolant flow sufficient enough to further drop coolant temps at speed.
Thermostat is rated at 83C. Running without the thermostat on the 3.4 engine increases the coolant flow sufficient enough to further drop coolant temps at speed.
#17
10-09-2007, 04:40 AM
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No, I am not recommending removing the thermostat. It would take too long to reach operating temperture. Just stating the effect it has on temperature.
#19
10-09-2007, 07:50 PM
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Rep Power: 122 A lower rated thermostat will have absolutely NO effect on final engine temperature. Unless you modify the thermostat or remove it to increase flow, final temperature will remain the same. You could weld the existing themostat open and your engine temperature would remain the same.
#20
10-09-2007, 08:18 PM
[quote=1999Porsche911;1387037]...flow of the water pump not sufficient. This has been corrected by Porsche in later models. [quote]
By this I assume you mean that water flow is too low only when engine is runing in lower RPM ranges?
What change(s) did Porsche make to increase the flow of coolant? Different pump, smaller pulley, or ??? Same as used on Turbo? And the $64 question, can these be retrofitted to the earlier 996's?
By this I assume you mean that water flow is too low only when engine is runing in lower RPM ranges?
What change(s) did Porsche make to increase the flow of coolant? Different pump, smaller pulley, or ??? Same as used on Turbo? And the $64 question, can these be retrofitted to the earlier 996's?
#21
10-09-2007, 08:48 PM
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Join Date: Aug 2004
Location: Chicagoland
Posts: 2,134
Rep Power: 122
[quote=Dscott;1390154][quote=1999Porsche911;1387037]...flow of the water pump not sufficient. This has been corrected by Porsche in later models.
By this I assume you mean that water flow is too low only when engine is runing in lower RPM ranges?
What change(s) did Porsche make to increase the flow of coolant? Different pump, smaller pulley, or ??? Same as used on Turbo? And the $64 question, can these be retrofitted to the earlier 996's?
I should have been more specific. The increase in flow came out when the 3.8 engine did. . If I remember correctly, flow was increased by more than 10% and radiators were made more efficient.
If you do the fan mod, your coolant temps will be maintained below 200F.
By this I assume you mean that water flow is too low only when engine is runing in lower RPM ranges?
What change(s) did Porsche make to increase the flow of coolant? Different pump, smaller pulley, or ??? Same as used on Turbo? And the $64 question, can these be retrofitted to the earlier 996's?
I should have been more specific. The increase in flow came out when the 3.8 engine did. . If I remember correctly, flow was increased by more than 10% and radiators were made more efficient.
If you do the fan mod, your coolant temps will be maintained below 200F.
Last edited by 1999Porsche911; 10-09-2007 at 08:54 PM.
#22
10-09-2007, 09:08 PM
[quote=1999Porsche911;1390226][quote=Dscott;1390154]
Is this why the non powerkit 3.8L don't have center radiators? Better coolant flow and bigger/better radiators?
...flow of the water pump not sufficient. This has been corrected by Porsche in later models.
I should have been more specific. The increase in flow came out when the 3.8 engine did. . If I remember correctly, flow was increased by more than 10% and radiators were made more efficient.
If you do the fan mod, your coolant temps will be maintained below 200F.
I should have been more specific. The increase in flow came out when the 3.8 engine did. . If I remember correctly, flow was increased by more than 10% and radiators were made more efficient.
If you do the fan mod, your coolant temps will be maintained below 200F.
Is this why the non powerkit 3.8L don't have center radiators? Better coolant flow and bigger/better radiators?
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