bluelt1z28

I have about 3000 miles on my new 383 supercharged engine and I installed a 160 thermostat and a csi electric water pump. The temp was normal until recently. When I am in stop and go traffic the temp rises up to the red mark, but when I get on the freeway or at higher speeds it drops slowly until I am at idle or in stop and go traffic then it rises again. At first I thought I had air in the system, so I bleed it, but it did'nt take care of it. Could my water pump be going out after 3000 miles? Could something else cause this? I also changed the thermostat.

OBE1 95Z28

3,000 miles ago I assume the weather was cooler. Is it only happening on hot days? How much does the temperature rise? Even a stock motor will get a temperature rise in stop and go traffic.

NewbieWar

temperature rise? lol talk about overheating... that thing needs to be air cooled

bluelt1z28

All the way to the red line

NewbieWar

yea mine is stock and it does that... i'm looking to get a elecric water pump... and coated headers...

you have to remember, when you increase your PSI, on your motor, the air heats up... not exactly sure how much, but it is substantial. this is one advantage of a intercooler. and when its already hot outside 90* plus weather, it might be 105* or even more by the time the valve closes.

then its hotter as the air comes out the exhaust (than w/o the supercharger) and then heating up your engine bay more... and now ur outside air is hotter...

lol, its a bad system, but without you moving, you will probably overheat yes...

(granted. none of this is sourced from anywhere I'm just using my imagination of the process, and my limited knowledge of science)

xtremetrans

There was no change in weather from one day to the next.

lt11997

At what temp do you have your fans coming on.

jpolz

Are you sure your fans are coming on at all?

xtremetrans

I know the fans are coming on, I checked them when I saw the temp go up, but I dont know at what temp. they came on.

jpolz

Try grounding the fan leads to stay on all the time and see if you still overheat. That should tell you if your fans are the problem or not.

baddboy1705

Just went through the same problem, though I was having trouble getting my heater to blow hot heat and it was overheating as well. If you are 100% sure that everything is in working order(thermostat, waterpump, nothing clogging your system) then bleed your system. I know it seems like that wouldn't help any, but air in your heads would cause your problem. I had to bleed my system 8 different times to get all of the air out. So after you think you've bled your system enough, did it 3 more times... hopefully this will solve all your problems, Good luck

http://shbox.com/1/4th_gen_tech2.html#radflushmy system

-Jeremiah
baddboy1705@aol.com ---if you need anything else

fireman

Try this stuff---www.evanscooling.com

TUNDRKYS

You know I've tried bleeding my system the way they say on that website, but I've never been able to run my car with the Radiator cap off. Once the car gets to operating temp, water starts gushing out, till I have to shut the car down. I know this can't be right.

baddboy1705

worked for me just fine...but i didn't do the rad cap thing, i left it on and used the two bleeder screws, just thought the link would help out, I found it after I fixed my problem...

-Jeremiah
Baddboy1705@aol.com

Luna

Sounds like the pump isn't working, thermostat is stuck or you have the pump spinning in reverse (change the polarity of the electrical leads)