You guys could try switching to Motul Rad Fluid, I'm not boosted right now but my temp gauge never goes above middle and stays below that all the time (needle isn't straight it's down a abit) and boiling point of it is 320*F which is double stock rad fluid. My friend runs it on his turbo gsr he has yet to have it go above the same point i'm at (he's running fluidyne+motul though). It works with water wetter also but ppl w/ motul who have used water wetter said with motul they haven't needed to mix

 

Well I just got back from Idaho and I believe it is a airflow issue.

I was driving up the mountains a lil bit in 85 degree weather and my coolant temp jumped to about 230 degrees. It only went to 230 when I was going uphill in 5th around 0 vacumm. It also did this in 4th as well when I was going up the hill. During this time I tried to add fuel as well as mess with my timing, but that didn't help at all. I don't feel it's a tuning issue, but I really wanted to check anyways.

During my drive I took a break at my friends house and drove the rest of the way during the night. It was 61 degrees out and not 1 single time did I overheat or have it go pass half. I wouldnt say it is overheating because normally I am at 220 degree's which is below half from what my AEM says. But it still runs hot and goes past half when I am going up hills or at 0 vacumm. While I am going up the hill the temp is regualted to 230, it never goes to full hot. I don't think it's a headgasket issue either because I boosted and boosted during the trip and not once did it overheat. Even if it was a small leak, it should be apparent especially under boosted conditions, and usually it will go straight to HOT.

What do you guys think? I thought it might also be air in my system, but I had it idle for about 45 minutes yesterday with the heater on and my fan came on like 4-5 times. Maybe it can be my coolant mix, cause it is pretty damn green.

I have a 19-20psi radiator cap that came with my radiator. Any ideas guys?

 

anybody ever try running a relocated rad cap on an expansion tank? reason i ask, is that i have noticed that most if not all the newer model cars dont run a rad cap on the rad core anymore. the rad cap is on a little swirl pot/expansion tank/coolant reservoir thing. supposedly helps remove air from the coolant.

for example


expansion tank info
http://www.meziere.com/index.php?pgName=we100

if coolant flow through the rad is a problem, this may help. if airflow through the core is a problem, this may help as well, but wont fix the problem....you will have to find a way to duct more air in. you could always go with a larger rad core too.

 

I have this problem, on the highway when it's wicked hot out boosting up hills my temp gauge tries to creep past half before I blast the heat to bring it back down. This got worse when I installed my front mount. My tiny little EG half radiator just isn't getting enough air-flow. It's 11 years old and is covered in bugs so I can't blame it. I am going to put a colder T-stat in and call it a day.

 

I'm having almost the same issues

overheats after like 20min of driving on the freeway but it's fine if i turn the heat on full blast.

I'm also running a FMIC that totally blocks the radiator and a watercooled turbo.

Removed thermostat and now it just happens more slowly?

I'm going to try to make sure that there are no air bubbles and maybe try making some kind of air duct to "ram air" the radiator..

 

those small slim fans do not move alot of air .. you need to put one on the front and one on the back or get a fal fan with a shroud

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by D@nnY &raquo;</TD></TR><TR><TD CLASS="quote">those small slim fans do not move alot of air .. you need to put one on the front and one on the back or get a fal fan with a shroud</TD></TR></TABLE>

yeah i only got this little fan

i'm thinking of having the manifold modded so i can use a thicker radiator along with a shroud

 

I guess a lot of us are having air flow problems! I figured it was just my problem! Well... I think im going to buy one of those large f.a.l. fans and put this slim line fan on the front of the radiator and put the large on the back... to get more air to flow through! Any more ideas?

 

i was thinking about making a "ram-air" type of air duct??

 

i have a 99 si, i am going to made a air shroud from the upper grille area with sheet metal

 

I know exactly what you guys are going through. Ive had the same problems. One situations was a fluidyne half size in my DA. Didnt work very well. This was with a cheap slim fan which Im sure had a lot to do with the problem. Then I bought the full length fluidyne for the same car and it worked awesome ( 2 pusher fans this time). The fans didnt even have to turn on unless sitting in traffic.

I have to run half style radiator again with my new setup and will focus on buying a nice fan w/shroud that pulls good cfm. The ducting seems like a good idea as well if you have the time.

 

Same problem here. Got a half PWR with the FAL+shroud to get ready for a FULLRACE setup but gonna have to pop in the old GSR rad and call it a day.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Boofster &raquo;</TD></TR><TR><TD CLASS="quote">Same problem here. Got a half PWR with the FAL+shroud to get ready for a FULLRACE setup but gonna have to pop in the old GSR rad and call it a day.</TD></TR></TABLE>

Living in AZ is a factor already...

 

alright, after a nice rad and thermostat with NO bumper, the ran cool as hell. put bumper back on, got damn near just as hot. Without the bumper it runs close to 22 degrees cooler. SO i might either keep it off in summer like a rice boy or install a STR diffuser on the FRONT bumper so i can retain the bumper and keep it cool. i am out of options, once you all see how sense the garrett core is, you will know. It shows why ebay intercoolers and good intercoolers cary so much in price.

 

u might want to turn and drill two holes out in the termostat to try to get the motor to run a little bit cooler, ive heard of people with sleeves doing this

 

The problem is the radiator not getting enough air to cool the water off. Drilling holes, or even running without a thermostat is not going to solve the situation. It will only prolong the overheating. Eventually the water will get hot.

I can drive around and stop all day with the heater on, without over-heating. This proves that there is a heat removal problem. The only real solution is to get air to the radiator. Now, how we do that with a wall for an intercooler, I do not know.

 

dame as mike1114
said check for bubbles.... I have had this happend too when starting my buildup for the first time.

 

so bascially jack the front end up, pull the cap and let it idle? my civic Si doesnt have a bleed screw

 

I have the same problem. I have a half size rad. with a 10" fan. The problem has been norrowed down to air flow. I can fix the problem by pulling the hood off the car but that was just to see if it would help. So....I guess I'm going to have to bite the bullet and buy a cowl induction c/f hood.

 

Well, I have an Evo style hood and I still overheat. It is the fact that the radiator is tucked behind the bumper and now a intercooler. Somehow we have to figure out how to get air between the intercooler and radiator.

 

correct sir

 

i have the same problem when im in the stop and go traffic when its hot.. i have my fan hooked up to a switch and when im in the stop and go traffic i turn it on.. it only overheats when its really hot outside.. i have a huge 30x12x3 bar and plate fmic that blocks all the airflow to my radiator.. im pretty sure nothing is wrong.. its just the underhood temps rising making things really hot.. that fan is pretty small so i would buy another one and get air moving into the engine from outside

 

Try disconnecting the connector to the Thermostat, jump the plug with some small wire or a Paper clip, go drive it since now your fan will be on Constant and see if that helps. Also check your oil make sure it isn't milky=blown headgasket. How is your Turbo, turbo mani , downpipe and dumptube situated and routed? I am sorry I didn't read through everyone's responses or the whole post either, just the original and thought I would try to help sir. If I am repeating anything or I missed something then me

 

What do you guys think about plumbing air to the rad. using these???

http://cgi.ebay.com/ebaymotors...QrdZ1

 

looks like a waste of money, those things can't be able to put out much air at all