Weird cooling issue with s14 SR20DET - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

ep3scott · 04-24-2016, 08:22 PM

Hey guys,

It's starting to get hotter here and I've noticed a weird issue with my sr20det it.

Normally it runs pretty cool, maybe 167f coolant and 185f oil, however recently the temps started going up.

I took the car off the road and replaced the water pump, thermostat, coolant temp sensor and fans.

I drove the car today and on the freeway it was reaching temps of around 200 for coolant and 210 for oil.

Here's the weird thing, I did a pretty big pull, maybe 4th gear to red line, I look down and the temps have dropped right down. Like 40 degrees lower in the coolant and the oil starts to drop down as a result.

Anyone got any idea why it would do that? Now whenever it starts getting hot I do a pull or a skid and it'll start getting cool again!

Any help would be great!

zenkicpe · 04-25-2016, 07:39 AM

Possible air in system - Burp it out using a funnel and an elevated front end.

Possible bad rad cap - Not holding pressure steady.

Possible bad/missing thermostat - Thermo could be going wacky on you opening and closing or just stuck open.

Possible failing water pump.

Possible bad head gasket.

In that order.

ep3scott · 04-25-2016, 08:57 AM

Thanks for the insight man!

I've replaced the pump and thermostat already. Air, Rad cap or HG...alrighty, I can work with that.

zenkicpe · 04-25-2016, 09:05 AM

You got it, let us know if you get it fixed.

04-24-2016, 08:22 PM	#1
ep3scott Leaky Injector Join Date: Jul 2014 Location: North Carolina Age: 31 Posts: 106 Trader Rating: (2) Feedback Score: 2 reviews	Weird cooling issue with s14 SR20DET Hey guys, It's starting to get hotter here and I've noticed a weird issue with my sr20det it. Normally it runs pretty cool, maybe 167f coolant and 185f oil, however recently the temps started going up. I took the car off the road and replaced the water pump, thermostat, coolant temp sensor and fans. I drove the car today and on the freeway it was reaching temps of around 200 for coolant and 210 for oil. Here's the weird thing, I did a pretty big pull, maybe 4th gear to red line, I look down and the temps have dropped right down. Like 40 degrees lower in the coolant and the oil starts to drop down as a result. Anyone got any idea why it would do that? Now whenever it starts getting hot I do a pull or a skid and it'll start getting cool again! Any help would be great!

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04-25-2016, 07:39 AM	#2
zenkicpe Zilvia Member Join Date: Apr 2015 Location: NEPA Age: 40 Posts: 267 Trader Rating: (1) Feedback Score: 1 reviews	Possible air in system - Burp it out using a funnel and an elevated front end. Possible bad rad cap - Not holding pressure steady. Possible bad/missing thermostat - Thermo could be going wacky on you opening and closing or just stuck open. Possible failing water pump. Possible bad head gasket. In that order.

04-25-2016, 08:57 AM	#3
ep3scott Leaky Injector Join Date: Jul 2014 Location: North Carolina Age: 31 Posts: 106 Trader Rating: (2) Feedback Score: 2 reviews	Thanks for the insight man! I've replaced the pump and thermostat already. Air, Rad cap or HG...alrighty, I can work with that.

04-25-2016, 09:05 AM	#4
zenkicpe Zilvia Member Join Date: Apr 2015 Location: NEPA Age: 40 Posts: 267 Trader Rating: (1) Feedback Score: 1 reviews	You got it, let us know if you get it fixed.