just bebuillt a d16z6 in my 95 del sol. I put on a new head gasket on it so i just cant see why itd be a head gasket. My car startd overheating last week but id let it sit for a few minutes and itd drive fine for the next 100 miles. Anyways its getting hot and coolant is blowing out of the resvivour overflow tank now. It blows out the top. I had a old thermostat in my other engine and put it in didnt solve anything. Radiator cap looks newer i havent tried puttin a new one of them on. If it is the head gasket why would the head gasket go bad i mean ive only put 1000 miles on it and its brand new after the build. I tightened the head down in sequence with the right torque, topped off with antifreeze so im kinda loss. Ive never let it get past 3/4 of the way hot so its never goten real hot

 

Did you bleed the cooling system?

 

no i didnt why would u have to bleed the cooling system i know how to do it tho am i ****ed

 

Bleeding the cooling system:
(This may take 20-30 minutes)
1) Park the car on an inclined driveway with the front end higher than the rear.

2) Push the dash heater lever/**** to MAX heat.

3) Follow the directions in the diagram below (hint: the bleed bolt is located where the upper radiator hose connects to the engine):

 

yea i never did that so this is why my car might be over heating and also i got my radiator fan hooked up to a toggle switch so it aint gonna kick on and off unless i turn the switch on but you think that my head gasket is bad

 

also man i drove the car after i did new head gasket and rebuild and it drove fine for 2 weeks and now its overheating im thinkn maybe cuz its like 95 degrees today and when i been driving it its early in the morning and nite time is why it may have not overheated so im try this but you think this is what the problem is

 

Bleed the cooling system and then go from there.

 

alright i bled the cooling system to where no bubbles was coming out just a steady stream and the car seems to be doing better but is still doing the same things just taking a little bit longer for it to occur, i am using just straight water now cuz the radiator fluid is getting too expensive at 10 dollars a gallan and i done used 2 is it okay to use just water til i find out the problem than use coolant, and what should my next step be

 

ive got a rebuilt z6 with high compression and i had overheating problems, it wouldnt idle for 3-4 minutes without overheating, and so a buddy of mine told me to take the thermostat out completely. i did that and now it runs cold almost all the time

 

so you are running your z6 without a therostat at all and it runs fine now without overheating huh.....was it bubbiling up in the overflow resivor like mine is

 

yup runs great. when im sitting idling for a little while itll get warm where it should be but as soon as i start driving the temp gauge just drops cold. also forgot to mention i have an aftermarket radiator + slim fan. not sure how much of a difference it would make with the stock radiator + fan u kno?

 

alright ima try to take off my thermastat and hopefully this will work ill post up what goes down once i get it off appreciate it man

 

This thread

 

Running without a thermostat may harm the engine in the long run, so don't remove it. Instead, install a new OEM thermostat and bleed the cooling system again.

If you bled the cooling system exactly as I posted, then check whether or not the lower radiator hose gets hot. If it remains cool, then coolant is not flowing through the radiator.

At some point, you may have to consider that your head gasket installation went wrong.

 

With this guy, yes that is a possiblity.

 

well to be honest i think my prob was too high temp of a thermostat. i actually am gonna try a lower temp thermostat but if it overheats im takin it back out.

 

make sure your fan is working and turn the key on but dont start it. take the plug off ur temp sensor on the thermostat housing and take a paper clip or wire and bridge the terminals together and see if ur fan turns on....

 

well i tried changing thermostat flushed radiator bled the coolant im thinking it might be my waterpump because its the original is there any way you can tell if its the water pump or not