hey hows it going i have a 87 iroc camaro with a 350 and i keep having this problem when i drive my car after about 10 mins it starts over heating really bad then about 5mins later the overflow bottle gets so hot and pressurized that the cap blows off. so far i drained the radiator and replaced the temp sensor and it still does it i also ran it without the thermostat and bought a lower temp one and it still does it the only prob it has is i got the dual fans but one doesnt work at all i put a switch on them both to turn them on and off when i want and it still over heats and suggestions would help big time

 

some places will check your radiator for free or a small fee, is it still the original radiator?

 

yea its still the same the body has 160,000 miles and the motor is a jasper with 60,000 so im taking it the rad has 160,000 its just pissing me off so bad could the one fan not working make it do that

 

if the radiator has not been out of the car in a while,
there might be leaves,litter,bugs, etc packed between
the condensor and radiator.When it's idling and getting
hot,does the radiator and hoses get real hot too?-if
they do,sounds like circulation is good,but radiator not
disapating the heat for some reason
On the original dual fan setup,only one fan comes on
at first,the 2nd comes on at a higher temp if temp
continues to raise,one fan should be able to cool at
idle in cool weather.

 

i think the hoses are getting hot, someone said its prob the head gaskets, so i took the driver side head of and i guess the gasket looked fine the passenger side is still on though cause i cant get the header off its hard to get to i did take the radiator off tho and it seemed fine i just cant really tell and its getting me so made i got all new gaskets for it i just gotta put it all back together. its getting so nice out and i wanna drive it so bad with the ttops off i just need to know what this stupid problem is someone said the heater core could be clogged but it the heat comes out really hot when its on i just need help

 

Standard rotation water pump?

 

yea i guess idk its the original one it drove fine when i first got her then i took it to the races and beat on it like an *** and now it started overheating

 

did you flush the radiator

or did you back flush the whole system?

ive got a similar problem and im back flushing the whole system in the morning

 

no i havent i guess i should let me know how it works for you i keep hearing these third gens always run hot

 

you may have a clog somewhere other than your radiator so a back flush would be a good way to make sure everything is flowing properly, and yeah they run hot but ive never seen a normal running thirdgen get over 220-230 without having some kind of issue, mine just recently started acting up but the cooling system is easy to take care of unless you got a cracked head or gasket(and all that is is money really, if you have patients nothing is extremely difficult), ive learned alot on this forum, and am asking for help in my own thread at the moment

 

If you had it at the track and it just started there, then it is probably head gaskets and possibly a cracked head. if you keep the car above 45 MPH that takes the fans out of the equation and leans toward the above or a blockage. I have a be-cool radiator and wired my fans to come on manually in traffic and mine is solved.

 

just an update from me, i backflushed my system today and everything is flowing nicely(though you should have seen the crud that came out), i suggest start with a backflush(buy the $3 kit and run some cleaner $5 or just some dish powder through your system), im thinking its a clog because usually when you have a blown head gasket you loose to much pressure in the system to blow a cap off