XtremeDime

iTrader: (16)

Im having a very intermittent over heating issue. I can drive around for a couple hours doing errands on a 65-70* day without overheating, then Ill drive around for an hour on a cooler day and start overheating. It doesnt happen every day, or even every other day. I cant seem to find any consistency to it.

My turbo is about 2 inches from the radiator but I have a blanket on it. Im running 2 12" fans;1 pusher and 1 puller. They are cheaper but were suppose to flow a decent CFM, and I have the blades set correctly as well as polarity. Im running the stock thermostat and have no ac.

I was looking at my tune and heres the fan settings:

Fan 1 On Temp:192
Fan 1 Off Temp:187
Fan 2 On Temp:206
Fan 2 Off Temp: 200

Should I start by replacing the thermo and the radiator cap?

onfire

iTrader: (17)

Is it overheating more in stop and go errands or 50-60mph runs?

XtremeDime

iTrader: (16)

Well where I live the speed limits are from 45-65 so....yes to both. lol. I dont drive it very hard on the street, its rare if I shift above 3k rpms.

barnat

iTrader: (59)

The Evans coolant made a world of differance in my ride if all else fails with your guesses

98Z28CobraKiller

iTrader: (17)

That's nasty stuff. The system must be COMPLETELY free of ANY water or antifreeze. Whatever it touches, it stays on. And track officials love it when it gets on the track. Also, it raises operating temp but doesn't boil or expand which is supposed to keep hot spots to a minimum. Personally, I would stick with water and water wetter unless you live in a freexing climate.

OP, did you remove the plastic airbridge that mounts to the bottom radiator support? That thing is VERY important.

BadgeZ28

iTrader: (28)

Are you running the stock 195 degree thermostat? I would have both fans turn on and off at the same point.

XtremeDime

iTrader: (16)

Ya the airdam is gone because after I hacked it up to let the intercooler piping through there wasnt much to it. I might be able to make one out of aluminum but I really dont think the air dam is the issue here though.

XtremeDime

iTrader: (16)

Stock thermo, but I run over 200 most the time. My next thing was to have both fans turn on at like 170.

LS6427

iTrader: (2)

Your fans should be set to come on and go off...together. Just like they do from the factory. I bet that solves your issues.

Also, if your fans aren't shrouded, also like they are from the factory, your fan efficiency will be greatly reduced. You lose alot of those cfms, alot.

160 t-stat and fans to come on at 185. I think thats where mine are set and I run cool as a cucumber no matter what...in 95* south Florida heat with my A/C running, in traffic. LT1 radiator, stock fans and shroud.

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XtremeDime

iTrader: (16)

What temp should they be going on and off at?

carlrx7

when you say overheating,, how hot its it getting? try a 160 stat? since your in alaska, i dont think the straight water is an option, but run the min amount of coolant req.

also, if your timing is really retarded, combustion temps are higher and can give you problems.

LS6427

iTrader: (2)

I;'m not sure what factory setting are...but from the factory the fans should go on and off together....and they always run on low and high settings..together. You need that one big hit when they come on. Shouldn't have them come on separately.

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XtremeDime

iTrader: (16)

Itll get to about 220-235. Maybe 240 on occasion before I notice and shut it down. Timing is advanced not retarded.

Straight water is an option, it really doesnt get that cold here. By the time it gets cold, the car is in the garage for the winter.

white01ss

iTrader: (37)

The fans are only important while the car is not moving so it doesn't sound like that's the problem. That air redirector is VERY important though. Unless you've turned the car into a front feeder the car needs one. I assume you have a front mount intercooler as well?

By front feeder, I mean opened up the front grill, removed the plastic air shield in front of the radiator, and sealed off the area in front of the radiator.

I would definitely get a 160* thermostat. You fan temps were pretty good BTW. Good Luck.

My settings:
Fan 1 On Temp:194
Fan 1 Off Temp:186
Fan 2 On Temp:201
Fan 2 Off Temp: 196

XtremeDime

iTrader: (16)

Air dam is gone along with that weird plastic ****. I have no a/c so no condenser either, and the fans are mounted directly on the radiator. The bumper has been opened up but mainly for the intercooler. Im sure some of that air is redirecting up though.

LS6427

iTrader: (2)

Aw man...you need the air dam on there.

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LS6427

iTrader: (2)

There's alot of things going on IMO. No shroud, no air dam, fans not working TOGETHER, stock t-stat, fans coming on at factory settings.

....and man I used to be Anchorage every month for 8-10 days each month....its friggin cold there.....lol

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XtremeDime

iTrader: (16)

Haha, its just so weird that it doesnt happen everyday. I drove around today for an hour on my lunch and it was much warmer today than yesterday. No problems.

LS6427

iTrader: (2)

You could very well have a sticking t-stat. Seen it before, my friends would chase all kinds of things and it ended up being a sticking t-stat. Sometimes it just doesn't open all the way....sometimes it does.

Easy thing to swap....you'll be better off with a 160 t-stat anyway. Give it a shot. But make sure you reprogram the fans to come on earlier with it.

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XtremeDime

iTrader: (16)

Ya, probably has the stock 10 year old tstat in it. haha

Should I go 160 or 180? Isnt optimal temp range 170-200?