93 240sx weird overheating problem, pls help! - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

TheConstipated · 05-20-2014, 01:27 AM

Well, maybe not so weird but I'm stump and I've tried searching to no avail.

So..a few days ago my S13's rad cracked and had to be replaced. It was working perfectly fine before.

Fast forward later and I've replaced the rad, t-stat, and water pump (cause you should and it was about time anyway).

Now, the problem. It idles fine but when I drive..it starts to overheat in about a few minutes or so. I check the hoses for temp, upper is hot, lower is cold indicating the t-stat is not opening (I did bleed and burp the system, yes).

I've checked the t-stat using the boiling water method and it opens up. So I put it back...and same thing. I also try turning heater on to see if it helps lower the temp but doesn't work

BUT, BUT! after letting the car sit off for a few minutes...I can feel the lower t-stat housing and lower hose getting hot. T-stat now opening? I turn the car back and drive again...overheat. Check hoses, upper is hot, lower is cold. Let it sit off for a few minutes and lower gets hot. WTF.

So the only thing I can think of is a faulty t-stat...but i'm not too sure. I haven't tried running the car without the t-stat to eliminate that possiblity yet. Fucking ballz man.

05-20-2014, 01:27 AM	#1
TheConstipated Leaky Injector Join Date: May 2007 Location: Southern Cali Posts: 72 Trader Rating: (0) Feedback Score: 0 reviews	93 240sx weird overheating problem, pls help! Well, maybe not so weird but I'm stump and I've tried searching to no avail. So..a few days ago my S13's rad cracked and had to be replaced. It was working perfectly fine before. Fast forward later and I've replaced the rad, t-stat, and water pump (cause you should and it was about time anyway). Now, the problem. It idles fine but when I drive..it starts to overheat in about a few minutes or so. I check the hoses for temp, upper is hot, lower is cold indicating the t-stat is not opening (I did bleed and burp the system, yes). I've checked the t-stat using the boiling water method and it opens up. So I put it back...and same thing. I also try turning heater on to see if it helps lower the temp but doesn't work BUT, BUT! after letting the car sit off for a few minutes...I can feel the lower t-stat housing and lower hose getting hot. T-stat now opening? I turn the car back and drive again...overheat. Check hoses, upper is hot, lower is cold. Let it sit off for a few minutes and lower gets hot. WTF. So the only thing I can think of is a faulty t-stat...but i'm not too sure. I haven't tried running the car without the t-stat to eliminate that possiblity yet. Fucking ballz man.