240sx s13 shutting off problems and over heating HELP

[s13Cory]

I have a 1990 s13, and I've been having problems with the over heating and it shutting off. This might be a lot to read but I tried to provide as much info as possible, any questions just ask and I'll try to answer them as quickly and efficiently as possible. Thank you for your time!


Over Heating problem: It'll heat up to half way fairly quick, then after driving for a couple of minutes, it'll start to over heat, sometimes it'll stick around the H, sometimes it'll drop down a little bit or back to the middle, stay for alittle and go right back up, tried to put the heat on blast, doesn't help. I've replaced so far, the radiator, thermostat twice with a new gasket (The guy before me that i bought it off of had like 3 boxes of thermostats in the trunk), bleed it, just about everything and still over heats. The carpet on the passenger was wet in a spot, and someone told me it was my heater core and then after I found that spot, the next day, it didn't over heat for a while, then snow came and it over heated that day and the wet spot never came back again (And no nothing spilled to make the spot), so as of now I am completely confused as to what is making my car over heat, so any idea's or if you know what it could be, please let me know. I maybe thinking something with the heater core.

Shutting off problem: My car (besides the over heating), will run pretty good. Recently got a new distributor and everything and the ignition system, ran okay, then went to friends house to put my new exhaust on (I had no exhaust on for a while and ran it a little without one, 3' dual straight pipe from ISIS), after that was installed, I took it for a test drive, ran good for about 5 minutes, then all of a sudden the RPM's just flat lined at 0, no gas response at all, and just shut off. Sometimes it'll shut off, sometimes it'll bounce right back up and I can keep going, but its completely random when it happens and I don't know what could be causing this problem..so any help on this or the over heating would be greatly appreciated, hopefully you read all of this. lol Again, thanks for your time!