How long does it take for your 964 to get close to the temp red zone? - Page 2

Mainja · 11-04-2009, 08:04 PM

Check the temperature switch (964-624-110-00-M100). My temps were running high and not engaging the fan. I could let the car run in the garage and let it heat up prior to changing and it would get real high. I jumped the pin connections first to ensure the relay was working and the fan would run in low and high mode before I determined it was the switch. There is a DIY @ http://p-car.com/diy/fan/. Check it out. It might the issue.

Mainja · 11-04-2009, 08:06 PM

Oh it's a cheap fix too. $36.50 on Pelicanparts.

tgage · 11-04-2009, 09:04 PM

I've done the fan mod which included putting a 944 switch on the dash. You can in the mean time disconnect the wire to the oil cooler fan infront which will force the fan to run at high speed all the time. The disadvantage of running in high all the time is that it tends to keep the engine "cooler" than it normally should run at lower speeds, and strangely enough, the car tends to run warmer when running at high speeds (ask me how I know)

Not sure, but I thought a failed relay switch could also cause the low speed fan not to kick in.

I can't find the link to the fan mod but it involves cutting a switch into the G12 line on the climate control box to manually run the oil cooler fan at High speed. I think I used a switch something like: http://www.944online.com/cgi-bin/ASI...lectrical-9441 and then removed the labeling.

It took me a while to figure out the root cause and I don't use the switch anymore. I replaced both the thermostat and then the relay (which fixed the problem).

-tom

ACSGP · 11-04-2009, 11:50 PM

Thanks all, really grateful for the input. Car's going in for a brake upgrade to the 964 Turbo versions, so good timing for him to check the oil cooler.

hackzi · 11-05-2009, 11:47 AM

Mine doesn't get past 10 o'clock even in traffic... was stuck in bad start-stop traffic this evening for cloSE to an hour and it didn't go past 10. Temp dropped quickly once car was on the move.

Wachuko · 11-05-2009, 12:34 PM

Before you spend big bucks on a thermostat... Do the test of jumping the contacts to manually check if the fan is working, then replace the ceramic resistor that controls when the fan comes one (these go bad with time...

ACSGP · 11-06-2009, 10:53 AM

OK, it's the thermostat. Big bucks??

The mechanic's looking for a used version. Does this require opening up the engine in any way?

Wachuko · 11-06-2009, 10:57 AM

Quote:

Originally Posted by ACSGP

OK, it's the thermostat. Big bucks??

The mechanic's looking for a used version. Does this require opening up the engine in any way?

Did he check if the fan works by pulling the relay and jumping the contacts?

Did he check the ceramic resistor?

Why is he trying to replace the thermostat without doing those checks first?

ACSGP · 11-06-2009, 10:59 AM

Quote:

Originally Posted by Wachuko

Did he check if the fan works by pulling the relay and jumping the contacts?

Did he check the ceramic resistor?

Why is he trying to replace the thermostat without doing those checks first?

Yes he did. Thermostat. This is the guy who built roadsleeper's RSR replica, and fitted 3 pre-993 911s with the 993 rear suspension. I think he knows how to fix the car.

Wachuko · 11-06-2009, 11:01 AM

Quote:

Originally Posted by ACSGP

Yes he did. Thermostat. This is the guy who built roadsleeper's RSR replica, and fitted 3 pre-993 911s with the 993 rear suspension. I think he knows how to fix the car.

Cool, just making sure.

ACSGP · 11-06-2009, 11:03 AM

Quote:

Originally Posted by Wachuko

Cool, just making sure.

Thanks for looking out for me

11-04-2009, 09:04 PM	#18
tgage Addict Rennlist Member Join Date: Dec 2003 Location: Atlanta Posts: 179	I've done the fan mod which included putting a 944 switch on the dash. You can in the mean time disconnect the wire to the oil cooler fan infront which will force the fan to run at high speed all the time. The disadvantage of running in high all the time is that it tends to keep the engine "cooler" than it normally should run at lower speeds, and strangely enough, the car tends to run warmer when running at high speeds (ask me how I know) Not sure, but I thought a failed relay switch could also cause the low speed fan not to kick in. I can't find the link to the fan mod but it involves cutting a switch into the G12 line on the climate control box to manually run the oil cooler fan at High speed. I think I used a switch something like: http://www.944online.com/cgi-bin/ASI...lectrical-9441 and then removed the labeling. It took me a while to figure out the root cause and I don't use the switch anymore. I replaced both the thermostat and then the relay (which fixed the problem). -tom __________________ 1991 C4 Coupe 1991 C2 Targa 1988 944 Work for AutoTrader.com Last edited by tgage; 11-04-2009 at 09:34 PM. Reason: more info

11-04-2009, 11:50 PM	#19
ACSGP Addict Rennlist Member Join Date: Mar 2009 Location: Singapore Posts: 140	Thanks all, really grateful for the input. Car's going in for a brake upgrade to the 964 Turbo versions, so good timing for him to check the oil cooler. __________________ ____________________________________________________ Current : 2004 A6 C6 3.0 Brilliant Black, chipped, lowered + forged MTM Bimotos 1990 Porsche 911 C2 Tip, Guards Red Not Forgotten : 1989 80 1.8S Manual, 1998 A6 2.4 FWD, 1994 80 2.0E, 1972 Beetle 1985 Kawasaki 900 Ninja, 1984 GPz 750, 1982 GPz 550 Unitrak

11-05-2009, 12:34 PM	#21
Wachuko Professor of Pending Projects Rennlist Member Join Date: Nov 2001 Location: Orlando, FL Posts: 7,310	Before you spend big bucks on a thermostat... Do the test of jumping the contacts to manually check if the fan is working, then replace the ceramic resistor that controls when the fan comes one (these go bad with time... __________________ Drive Safe! Jaime Diaz (a.k.a Wachuko) '83 911 Schieferblaumetallic SC Coupe -> Transformation '91 964 C4 Wide-Body Cabriolet '09 BMW X5 xDrive35d MaxJax low-ceiling two-post lift Missed but never forgotten: '02 996TT Seal Gray '04 VW Golf R32 '97 993 C2S Vesuvius Metallic with Aerokit '87 951 Rennlist Member 020402-3738

11-06-2009, 10:53 AM	#22
ACSGP Addict Rennlist Member Join Date: Mar 2009 Location: Singapore Posts: 140	OK, it's the thermostat. Big bucks?? The mechanic's looking for a used version. Does this require opening up the engine in any way? __________________ ____________________________________________________ Current : 2004 A6 C6 3.0 Brilliant Black, chipped, lowered + forged MTM Bimotos 1990 Porsche 911 C2 Tip, Guards Red Not Forgotten : 1989 80 1.8S Manual, 1998 A6 2.4 FWD, 1994 80 2.0E, 1972 Beetle 1985 Kawasaki 900 Ninja, 1984 GPz 750, 1982 GPz 550 Unitrak

11-04-2009, 08:04 PM	#16
Mainja Addict Rennlist Member Join Date: Apr 2009 Location: Lawton, OK 73505 Posts: 10	Check the temperature switch (964-624-110-00-M100). My temps were running high and not engaging the fan. I could let the car run in the garage and let it heat up prior to changing and it would get real high. I jumped the pin connections first to ensure the relay was working and the fan would run in low and high mode before I determined it was the switch. There is a DIY @ http://p-car.com/diy/fan/. Check it out. It might the issue.

11-04-2009, 08:06 PM	#17
Mainja Addict Rennlist Member Join Date: Apr 2009 Location: Lawton, OK 73505 Posts: 10	Oh it's a cheap fix too. $36.50 on Pelicanparts.

11-05-2009, 11:47 AM	#20
hackzi User Join Date: May 2006 Location: Singapore Posts: 36	Mine doesn't get past 10 o'clock even in traffic... was stuck in bad start-stop traffic this evening for cloSE to an hour and it didn't go past 10. Temp dropped quickly once car was on the move.