SR overheating at higher speeds - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

aladdin · 08-18-2010, 11:00 PM

At first my water pump was leaking and causeing my car to overheat. I changed it and car runs great driving around locally at 50 mph.

I went on a londer drive today from Sd to Irvine and when i would cruise at 70-80 i would realize my car was get hotter. the needle pointed at the mark above the middle on the thermostat. and if i drive a little faster it would raise closer to the H and almost at the H. But as soon as i reduced my speed it would steadily lower.

Another example, Cruising back home from irvine, the car's temp is fine. I drop to third, and accel thorugh the powerband through 4th and let off and the needle is one mark away from the H.

I have a stock radiator and it does have a clutch fan. any ideas on how i can help my motor run cooler and stay reliable?

thanks guys and gals in advance for the help.

Mikey88 · 08-18-2010, 11:00 PM

do you still have the shroud on it too?

S13RB25DETDRIFTER · 08-18-2010, 11:02 PM

did u bleed the system when u change the water pump ???

Mikey88 · 08-18-2010, 11:05 PM

haha forgot that main one right there

aladdin · 08-19-2010, 03:09 PM

Ya flushed everything out and put fresh fluids. And the shroud is still there too

shiftdrift · 08-19-2010, 03:24 PM

do you still have the stock bumper with no slots cutout? my friends sr was overheating doing pulls in higher mph but just cruising it was fine. it ended up being the bumper wasn't getting air to it.

aladdin · 08-19-2010, 07:00 PM

Ya I have stock bumper. What slots do u speak of?

Mikey88 · 08-20-2010, 12:58 PM

do you have a fmic with a stock bumper?

greenman100 · 08-20-2010, 01:11 PM

Water pump is bad/cavitation.

aladdin · 08-20-2010, 09:56 PM

Ya I have a front mount. An the water pump is brand new from Nissan parts cc. Hmm

Bossman14 · 08-30-2010, 03:52 AM

are you leaking any fluids?

aladdin · 09-01-2010, 08:48 AM

nope. only when it gets hot and say i pull over, a little from my overflow tank.

*slider2828* · 09-01-2010, 09:07 AM

Yup.... bad flush you still have air...... do it right or bring it to someone.... There are a LOT of threads on how to bleed the system...... and it is not just replace and fill the radiator....

08-18-2010, 11:00 PM	#1
aladdin Leaky Injector Join Date: Jun 2010 Location: SD Posts: 122 Trader Rating: (1) Feedback Score: 1 reviews	SR overheating at higher speeds At first my water pump was leaking and causeing my car to overheat. I changed it and car runs great driving around locally at 50 mph. I went on a londer drive today from Sd to Irvine and when i would cruise at 70-80 i would realize my car was get hotter. the needle pointed at the mark above the middle on the thermostat. and if i drive a little faster it would raise closer to the H and almost at the H. But as soon as i reduced my speed it would steadily lower. Another example, Cruising back home from irvine, the car's temp is fine. I drop to third, and accel thorugh the powerband through 4th and let off and the needle is one mark away from the H. I have a stock radiator and it does have a clutch fan. any ideas on how i can help my motor run cooler and stay reliable? thanks guys and gals in advance for the help.

09-01-2010, 09:07 AM	#13
slider2828 Premium Member Join Date: Oct 2004 Location: San Francisco, CA Posts: 5,824 Trader Rating: (13) Feedback Score: 13 reviews	Yup.... bad flush you still have air...... do it right or bring it to someone.... There are a LOT of threads on how to bleed the system...... and it is not just replace and fill the radiator.... __________________ Turn and Burn!

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08-18-2010, 11:00 PM	#2
Mikey88 Zilvia Member Join Date: Jul 2008 Location: Somewhere in California Age: 33 Posts: 229 Trader Rating: (0) Feedback Score: 0 reviews	do you still have the shroud on it too?

08-18-2010, 11:02 PM	#3
S13RB25DETDRIFTER Leaky Injector Join Date: Nov 2008 Location: riverside Age: 31 Posts: 113 Trader Rating: (1) Feedback Score: 1 reviews	did u bleed the system when u change the water pump ???

08-18-2010, 11:05 PM	#4
Mikey88 Zilvia Member Join Date: Jul 2008 Location: Somewhere in California Age: 33 Posts: 229 Trader Rating: (0) Feedback Score: 0 reviews	haha forgot that main one right there

08-19-2010, 03:09 PM	#5
aladdin Leaky Injector Join Date: Jun 2010 Location: SD Posts: 122 Trader Rating: (1) Feedback Score: 1 reviews	Ya flushed everything out and put fresh fluids. And the shroud is still there too

08-19-2010, 03:24 PM	#6
shiftdrift Nissanaholic! Join Date: Nov 2009 Location: indiana Age: 31 Posts: 2,242 Trader Rating: (42) Feedback Score: 42 reviews	do you still have the stock bumper with no slots cutout? my friends sr was overheating doing pulls in higher mph but just cruising it was fine. it ended up being the bumper wasn't getting air to it.

08-19-2010, 07:00 PM	#7
aladdin Leaky Injector Join Date: Jun 2010 Location: SD Posts: 122 Trader Rating: (1) Feedback Score: 1 reviews	Ya I have stock bumper. What slots do u speak of?

08-20-2010, 12:58 PM	#8
Mikey88 Zilvia Member Join Date: Jul 2008 Location: Somewhere in California Age: 33 Posts: 229 Trader Rating: (0) Feedback Score: 0 reviews	do you have a fmic with a stock bumper?

08-20-2010, 01:11 PM	#9
greenman100 Zilvia Addict Join Date: Aug 2008 Location: Florida Posts: 694 Trader Rating: (18) Feedback Score: 18 reviews	Water pump is bad/cavitation.

08-20-2010, 09:56 PM	#10
aladdin Leaky Injector Join Date: Jun 2010 Location: SD Posts: 122 Trader Rating: (1) Feedback Score: 1 reviews	Ya I have a front mount. An the water pump is brand new from Nissan parts cc. Hmm

08-30-2010, 03:52 AM	#11
Bossman14 Join Date: Jul 2010 Location: okinawa japan Posts: 13 Trader Rating: (0) Feedback Score: 0 reviews	are you leaking any fluids?

09-01-2010, 08:48 AM	#12
aladdin Leaky Injector Join Date: Jun 2010 Location: SD Posts: 122 Trader Rating: (1) Feedback Score: 1 reviews	nope. only when it gets hot and say i pull over, a little from my overflow tank.