i have a 89 rs 305 when in town driveing temp are reaching 230 have 180 thermostat, fan is working . any suggestions? it has been in the 90 outside.driveing it run about 190. need help for intown :beers:

The computer and other smog stuff need a 195* thermostat to operate properly. Install a new 195 t'stat and flush out all the cooling system well, then add new coolant. See if that helps.

thanks for the advice . how will this help in town temps ?

i have an 82 305 with the same problem. The third gen camaro's came factory with high operating temps. I bought a 160 themostsat to lower the temps quite a bit. I havent installed it yet, but when i do, ill tell u if it worked.

Hopefully you will flush out any debris that is partially plugging your radiator,engine and other components. On that '82 I'm sure your temps will go down ! In time your smog system will plug up, because you aren't reaching operation temperature. Notice that companies like Hypertech, reprogram the computer, with a different chip etc., so you can run a cooler t'stat.

weel i threw on the 160 t'stat today and ran all of the air out of the system, i didnt do a complete flush however. I just drained all the coolant i didnt need, to replace the t'stat. Well its running much cooler now. It used to run 245 max. now it runs at about 180 max. Incredible!! :clonk:

Nice to see you take our advice. You just put a band aide on your real problem. Remember what was said here, when you get a larger repair bill in the future. I hope you listened, TNT57racing and cured the real problem !

well ok, i will flush out my rad in a couple of days, becuz i do not have time right now. Do you think the temps will drop even more??

Flushing your radiator may or may not cure the problem either ! It is a good place to start, along with clear airflow etc. A new radiator cap wouldn't hurt, either. My recomendation was more for tnt57racing, who's temps are not that far off from normal ! You haven't told us what yours is running for temps. etc. I can think of four GM vehicles that I have owned, all had 195* t'stat as recommended and always ran fine at 200* I know that water boils at 212*, but not when you run a 50/50 mix and if your cooling system is properly under pressure. That why a new radiator cap would be needed. Your old one should say the PSI rating on it, and replace it with what GM recomends.

I never really thought of the rad cap, interesting...

i am taking your advicxe on the thermostat thanks . i believe i might of found the problem . put a pressure check on radiator found leak in water pump . could this be the cause

the fans were set to come on about 230 on these cars anyway. With the low airflow without the fans running, the temp will shoot right up. I always turn the A/C on, because it turns the fan on and it helps keep it cool.