I’ve read lots of threads about temp issues on sc vettes .. ecs sc alky kit dewitts radiator .. I’ve been having this issue for about 2 years now ( I don’t drive it much ) and can’t figure it out . I went for a drive ( it’s 60 degrees outside windy ), had the ac off and temps went up to 185 stop and going and when I gunned it they would drop to 175-178 .. on the stop and go it would go up to 185-189 .. then I turned on the ac and the temps went up to 220 ( oil temp 225) and probably would’ve gone higher had my home been further away.. I’ve heard about debris clogging radiators so about a month ago installed a dewitts instead of cleaning it out .. and it’s doing the same .. the fans kick in and when at a stop light will shave off a few degrees then when I get going they go to rise again and it’s 60 degrees outside = don’t even want to imagine the summer temps .. the temps really begin to rise when the ac is on.. I was thinking thermostat, but since it’s sc it would be a hassle to replace Without really knowing if it’s that.. with the ac off I gunned it and it cooled down so I don’t believe debris is blocking the radiator and the intercooler seemed to be doing its job . Anyone have ideas on what it could be? Last resort is to take it to a shop out here in Orange County and get raped $$$ lol

 

are you SURE both fans are running with the AC on? ...because if you are running normal and get up to speed and the temp drops that means air is flowing through the radiator so I would imagine the same holds true with the AC on and driving, it only gets hot sitting still. I went through lots of heat issues with my SC C5 and airflow was the key to keeping them down.....even with a Dewitts Radiator and SPAL fan kit I ended up modifying the front of the car...of course I was slammed and the C5 is a bottom feeder so its not really the same....I would look at the fans....the second one should be running with the AC on

 

both fans? I believe I only have one ( stock from the old radiator) .. found a person selling the dual fans set from dewitts thats for my radiator specific and he said 150$ so I’m going to try that and see .. I remember a while back one summer I had that issue and the shop said that the wires were melted , fuse was burnt out , and the fan module was fried so I had them install a used fan module i got from someone . Going to have my friend install that, new wires, check the fuse again etc and see if that helps.. I’m also in the process of ordering a new front bumper so if the fans don’t fix that issue = then I’ll get creative with the new bumper by adding customized air ducts etc . And if that doesn’t help= I’m throwing the vette into the ocean and collecting the insurance money lol

 

I'm thinking C5 with two fans........the answer may be in your tune....which is a simple fix...just need someone with HPtuners to fix it

C6 Cooling Fan

The ECM controls the variable speed, engine cooling fan by pulse width modulated signal. Fan speed is adjusted from 10-90% duty cycle (PWM). When multiple fan speed requests are received, the ECM uses the highest speed of all the requests.

ECM Command ON Conditions:
Duty cycle starts with any of these conditions:

ENG coolant temp at approx. 204F and reaches high speed above 235F.
A/C PRESS reaches approx. 160psi., high speed above 360psi.
ENG OIL temp above 302F (high command)
TRANS OIL temp above 270F (high command)
ENG OFF: Coolant >235F, or A/C PRESS >249psi. (command low set to 50%), with shut OFF at <230F coolant temp or 241psi A/C PRESS, and FANS auto OFF after 2 minutes, regardless of temp.


OR you have a bad fan controller

 

yea I’m thinking it has to do with the wiring or fan module since it gets over 105 at times here in Cali . I also noticed how tight stuff is with the radiator , ac condenser, intercooler .. that might be an issue but seems only when the ac is on .

 

holy ****.....no wonder it gets hot.......I'm surprised it cools at all.....

 

yea I’m kinda stomped on how to fix that lol fml Probably going to look for a shop that has dealt with that issue before hopefully and see

 

is there a way to push out the IC a bit forward or a modification to the foam in order to push out the IC ?

 

The AC condenser gets really hot and with the intercooler up there too, it can get hot quick in stop and go traffic. That's when you really need better fans and shroud. Need to pull more CFM through all that mess.

Also with an ECS kit you can make shrouds for the sides of the radiator that force air thru the radiator instead of allowing it to go around the sides. This helps a ton.

Look at Prospeed fans and their shroud (not cheap but works really well), and then make the side shrouds and you would probably be good to go...as long as you have already eliminated the simple stuff....water pump, debris in AC condenser, too much air in coolant system, coolant blockage, tuning, etc.

 

the dewitts radiator was installed about a month ago brand new.. I’m hoping it’s just the fan module or a cable or the fan just sucks lol I was sitting in the car and letting it idle for about 5 mins and the temp climbed up to 189 deg .. I accelerated a little and the temps went back down to 180 and the fans seemed to stop spinning .. then when I let it idle again went back up to 189 .. then turned the ac on and can hear the fan spin a bit louder than when just idling .. .. went up to 190 then when I accelerated it went back down to 183 and when left idling again back up to 187 .. it’s about 74 degrees outside .. I’m getting a new front bumper soon so when it comes And I remove the current one I’ll see what can be done .. I noticed there’s about a 1-1.5 in space between my radiator and the fan but my Intercooler is right up against the condenser/radiator .. maybe I can do something to reposition stuff and see if that helps . I wouldn’t mind adding extra air ducts to the bumper to get more air into the IC or condenser/radiator . I did in the past have my fan module go out and wiring fry due to the heat .. they were replaced by a shop but maybe they didn’t know what they were doing lol

 

Check the fan connector. Focus on female side. I bet middle wire socket is splayed open

 

This thread may be helpful as it has examples of a couple mods to the ECS system that work well. Might be good to do them while you have the front apart.

https://www.corvetteforum.com/forums...rformance.html

 

yea I’m almost positive it’s an issue with the wiring/connections .. fortunately someone sold Sold me a dual fan dewitts combo for 200$ so I’m just going to install those and upgrade the wiring and connectors before installing .

 

Its probably still going to overheat. With that setup you need better fans.

 

Those fans go for 400-500$ so at 200$ it’s not a bad risk to take . Once it’s installed I’ll update on it . If not= I’m just going to have AHP install titanium pistons, rods, etc and build the engine lol I will not let this issue get the best of me

 

those Dewit SPAL fans BLOW...... he may need to have the tune adjusted a bit so they come on sooner and run a bit longer while he is at it

 

I just bought them not what I’m what to hear. Care to elaborate?