weird temp display - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

*Sonic Motor* · 11-20-2005, 07:30 PM

so i was going down hill on a cold night. and all of a sudden, my S13 temp reading was going lower. I thought the needle broke so i didnt care and went faster...then the needle just went to C...then below C

So i pulled over and let it idle for a minute, and the temp went back to norm.

the complain: temperature reading shows cooling down while going down hill on the mountains. it runs normal everywhere else i go. This only happens when i go DOWN hill for some reasons. Anyone have the same problem or know whats the cause and correction?

nsn240 · 11-20-2005, 07:57 PM

might have something to do with the coolant flow... i dont really know, oem water temp sensors generally suck

spoolin240sx · 11-20-2005, 08:06 PM

you have air in your cooling system, get the air out and you'll be good to go

*Sonic Motor* · 11-20-2005, 08:15 PM

ah...i see...u guys are awesome.

btw, how do i get the air out?

my water pump is leaking, what that have been my problem??

just to clear things up, the low temp reading is a FALSE reading right???

spoolin240sx · 11-20-2005, 08:21 PM

yeah its a false reading, its reading the air thats stuck in there not the water. wait till it cools off and there is no pressure in the system then:
1) take the coolant burp bolt out and fill the radiator up till it starts coming out of the burp hole.
2) put the bolt back then mess with the hoses a little and get the bubbles out.
works for me but i believe the fsm might have a little different procedure

edit: yeah your water pump is why it got like that, replace that leaky water pump asap

11-20-2005, 07:30 PM	#1
Sonic Motor www.SonicMotor.com Join Date: Aug 2005 Location: 4981 N Irwindale Ave #100, Irwindale, CA Posts: 9,481 Trader Rating: (113) Feedback Score: 113 reviews	weird temp display so i was going down hill on a cold night. and all of a sudden, my S13 temp reading was going lower. I thought the needle broke so i didnt care and went faster...then the needle just went to C...then below C So i pulled over and let it idle for a minute, and the temp went back to norm. the complain: temperature reading shows cooling down while going down hill on the mountains. it runs normal everywhere else i go. This only happens when i go DOWN hill for some reasons. Anyone have the same problem or know whats the cause and correction? __________________ Sonicmotor.com \| Zach @ Sonic Motor \| 626.363.9036 \| [email protected] Check out our website! ( CLICK )

11-20-2005, 08:15 PM	#4
Sonic Motor www.SonicMotor.com Join Date: Aug 2005 Location: 4981 N Irwindale Ave #100, Irwindale, CA Posts: 9,481 Trader Rating: (113) Feedback Score: 113 reviews	ah...i see...u guys are awesome. btw, how do i get the air out? my water pump is leaking, what that have been my problem?? just to clear things up, the low temp reading is a FALSE reading right??? __________________ Sonicmotor.com \| Zach @ Sonic Motor \| 626.363.9036 \| [email protected] Check out our website! ( CLICK )

11-20-2005, 07:57 PM	#2
nsn240 Zilvia Addict Join Date: Aug 2005 Location: pa Posts: 642 Trader Rating: (1) Feedback Score: 1 reviews	might have something to do with the coolant flow... i dont really know, oem water temp sensors generally suck

11-20-2005, 08:06 PM	#3
spoolin240sx Join Date: Sep 2003 Location: Sacramento Age: 41 Posts: 37 Trader Rating: (0) Feedback Score: 0 reviews	you have air in your cooling system, get the air out and you'll be good to go

11-20-2005, 08:21 PM	#5
spoolin240sx Join Date: Sep 2003 Location: Sacramento Age: 41 Posts: 37 Trader Rating: (0) Feedback Score: 0 reviews	yeah its a false reading, its reading the air thats stuck in there not the water. wait till it cools off and there is no pressure in the system then: 1) take the coolant burp bolt out and fill the radiator up till it starts coming out of the burp hole. 2) put the bolt back then mess with the hoses a little and get the bubbles out. works for me but i believe the fsm might have a little different procedure edit: yeah your water pump is why it got like that, replace that leaky water pump asap