PDA

View Full Version : Water Temp. Gauge Fluctuation

kanekz
12-10-2002, 12:15 AM
About a month or so ago, I noticed that my water temperature would fluctuate alot on my S14. Its not that it would over heat, but it would drop a lot. When the engine is warmed up and idle, it runs at normal temp range (below the halfway point). The water temp starts to DROP around 2,600rpm. The faster and harder I go in the car, the faster it falls (when engine is reving past 2600rpm). So the rate of the water temp falling, depends on the acceleration of the engine. As soon as I let the gas off the pedal, the water temp gauge needle rises back to normal temp range.

I dont really have a clue what is causing this. I am kind of worried that it might be something big. At first, I thought it might have been my thermostat, but I doubt it. Does anyone else know?? &nbsp;<img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/confused.gif" border="0" valign="absmiddle" alt='???'>
HippoSleek
12-10-2002, 08:06 AM
I tend to think thermostat. &nbsp;Temperature fluctuations from mid to high usually mean air in the system. &nbsp;Fluctuations from mid to low usually mean thermostat. &nbsp;It's $5.00 and 15 minutes to change - so it's not a bad place to start.
kanekz
12-10-2002, 07:09 PM
</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (HippoSleek @ Dec. 10 2002,07:06)</td></tr><tr><td id="QUOTE">I tend to think thermostat. Temperature fluctuations from mid to high usually mean air in the system. Fluctuations from mid to low usually mean thermostat. It's $5.00 and 15 minutes to change - so it's not a bad place to start.</td></tr></table><span id='postcolor'>
Well, so it is what I suspected it to be, the thermostat. &nbsp;Well I was searching around and couldn't find anything of a Write-up of installing a thermostat. &nbsp;I found it for others cars online, but I was wondering if anyone knew of a writup for a 240sx specifically (even better if its S14). &nbsp;But I think its basically the same for any car so..I'll see what I can manage. Any help is appreciated of course!
kanekz
12-14-2002, 02:36 PM
Well I did some asking around. &nbsp;It might not be my thermostat. It actually might be the temperature sensor (under the throttle body) that is not going to the ECU but to the gauge cluster. &nbsp;Im going to take a better look at it on Mon. &nbsp;Lets hope it not going to run me too much $$.
kanekz
12-18-2002, 10:53 PM
Still not sure, does anyone have a clue? :confused:
95Blue240sx
12-20-2002, 01:00 AM
i dont think it would be air in the system. i notice on my car, a 95, that if there is just a little bit of air it will overheat. i remember someone showing me a page listing the recalls of the s14, more specifically for a 95. it listed the radiator being recalled. a newer desing was suppose to fix the problem. my car would overheat all the time and it would lose water too. i found the problem one day when changing oil cause i noticed water dripping from the pump. all i did was change the gasket and no problems since. i know this is totally opposite of your problem but just for reference.

but i agree with everyone else. if the thermostat stays open the water flows too freely and doesnt cool.

if you want a write up just pm me and ill write it up for you. ive done it.
kanekz
12-20-2002, 04:10 AM
Originally posted by 95Blue240sx
i dont think it would be air in the system. i notice on my car, a 95, that if there is just a little bit of air it will overheat. i remember someone showing me a page listing the recalls of the s14, more specifically for a 95. it listed the radiator being recalled. a newer desing was suppose to fix the problem. my car would overheat all the time and it would lose water too. i found the problem one day when changing oil cause i noticed water dripping from the pump. all i did was change the gasket and no problems since. i know this is totally opposite of your problem but just for reference.

but i agree with everyone else. if the thermostat stays open the water flows too freely and doesnt cool.

if you want a write up just pm me and ill write it up for you. ive done it.

My problem really isnt about overheating, but not enough heating! :D I dont know what to do yet. I guess just replace thermostat first. I would like that write up on the thermostat though. Thanks!