i didnt read the whole thread, but did you check to see if the upper radiator hose is getting as hot as the bottom hose?

 

yea, its about 235f on the freeway, 210f on the streets. 225f on the freeway with heater on

 

Is your intercooler blocking your radiator?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jdmcivicb16a2sc61 &raquo;</TD></TR><TR><TD CLASS="quote">yea, its about 235f on the freeway, 210f on the streets. 225f on the freeway with heater on</TD></TR></TABLE>

no im not asking what are the temps.

it sounds like your thermostat may not be opening.

 

how hot is coolant when the dash needles is at half way, just curious.

 

i would double check what crome is reading, thats the temperature the engine goes off of....the reason why its hotter on the highway...cuz the thermostat mite not have to open or the fan doesnt kick on when u are at a certain speed?? GOing that fast the air moving across the radiator acts like a fan...im guessing....Plus the sender that u are taking the reading from should be the hottest part since its the last place where it exits the motor into the radiator....

so when u are at idle...and u slow down....the thermo stat opens, fan kicks on and fresh cool coolant is being cycled thru the engine making your temperatures go down...make sense??? haha

You will notice too...if you sit and watch ur temp gauge...when the fan kicks on...your temperature will increase for a moment then return back down or cooler...its becuase all the hot water is being exited or forced out the top rad hose...which will increase temp slightly and decrease when new coolant comes thru...

 

Have you tried to run the fan only at slow speeds? I've heard, no proof, that running the fan down the highway acts as a negative against the air that is already trying to get through. My only thoughts on why this may be true, is your fan might push air at what 10mph and the air on the freeway is trying to go through at 70+..... so it would actually be a restriciton??? Just a thought.

 

okay....today i drove only streets, and it got up to 230f....so i guess its not just on the freeway


Water pump? or am i just going crazy and leave it alone

 

did u do what mase told you??? are both rad hoses very hot??

Pull ur thermo stat off and run without it...see if temps change...if not...ur rad is not cooling the coolant correctly....

 

Yea they are both hot as ****.....and running with out a thermostat is a bad idea

 

I have the same problem, but I have a gutted thermo (thermo still there just gutted). Sometimes the car will be fine for 100's of miles other times I can overheat it in 15 minutes driving around town. Fan is running constantly and spinnging the correct way.

Does this mean anything to you? Car runs fine for 110 miles, as soon as I lift throttle to decelerate temperature gauge spikes up then comes back down.

 

my stock gauge did that, it would be half way as soon as i decelerate off the freeway the temperature gauge spikes up then comes back down. but now i have a aftermarket gauge and it goes from 235f down to 210ish off the freeway.

 

Have you checked the thermostat is it opening? Bled the any air that may be in the system? It is definitely running to hot imo. Try adding more water and less coolant. Clogged radiator? broken top tank??

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by coneheadsracing &raquo;</TD></TR><TR><TD CLASS="quote">Have you tried to run the fan only at slow speeds? I've heard, no proof, that running the fan down the highway acts as a negative against the air that is already trying to get through. My only thoughts on why this may be true, is your fan might push air at what 10mph and the air on the freeway is trying to go
through at 70+..... so it would actually be a restriciton??? Just a thought.</TD></TR></TABLE>

id start off with setting the fan up like oem and not having it jumped, id bet this would be the cause of ur increase in temps on the highway. As for sitting at 210 when idling its probably a combination of the turbo and manifold giving off heat and maybe ur thermostat not opening properly.

 

Fan doesn't generally run at freeway speeds....

 

doesnt matter if its on off on the freeway....i jumped it after it was being a bitch and now its back to oem and still over heating. or its just too damn hot in az and thats what i get for having a turbo car

 

Well, i don't have your setup obviously, but i did some long driving last night, to the drag strip. 90 degrees and super humid. I have my fan wired up to a swtich, works normal still too. The way there 75 down the highway, i was at 200 degrees maybe 205. The way back, i ran the fan on the highway little cooler out too, not much, was about 195 ish. I have a del sol larger radiator in my 92 hatch. Nothing but some intercooler piping blocking my radiator, but it is mounted back a couple inches and angled slightly, so not the optimum setup.

However, in my opinion, you have issues, if you hit 210-220 maximum on a hot day, but 235....

Personaly, i'd buy a stock headgasket, some copper sealant, and redo it, while you have it apart run water thorugh all your hoses, and radiator to make sure nothing is blocked or plugged.

Not to expensive, and doesn't take long, kind a pain, but it could fix it.... i don't know....

 

i have a similar problem.
when i cuise on the highway i have aprox. 220°F and when i push it realy hard i have 240-245°F when doing a full throttle run.

The temps are also going down very quick after i release the throttle back to ~220°F.

the stock water temp gauge stays exactly where it stays when the car is warmed up normaly and also doesn't rise while i'am doing a full throttle run when crome (Sensor Voltage) ready aprox. 240°F.

but i can't beleave that the stock gauge is so damn inaccurate... or does the someone know if the gauge sender reads another water situation then the ecu sensor?

Best regards

 

iono man, it might be easier just put a whole new motor in.

 

nah the sensor on the head is it.

 

Kind of ghetto but pull off your hood and see if it's just trapped heat from the turbo/manifold...possible your hood is cowling air and not letting any hot air out?

 

The stock guage is more like an advanced dummy light, its good more for showing you're cold, warmed up, or overheating. Mine will stick at the normal possition while I drive, then when its sitting idling (coolant lines not in turbo yet), it starts to slowly rise.

If the fan is jumpered, I'd suspect that's why. You obviously have more load at 60-80mph than on the streets. Even in stop & go, you get the extra coolant flow from the higher water pump speeds. I bet if you had it react just to high temps, it would read a bit hotter around town.

 

okay...210f-220f on the streets (with heater on 207ish) and 235f on freeway (with heater on 225ish). i flushed the system today, new thermostat 180 (the fan kicks on a 210f is that where it should?) new 50/50 coolant a redline water wetter. im looking on ebay for a better gauge...this one jumps to 235f-280f. bad news its i think i saw either lots small round specks of oil or rust floating at the top the coolant.

 

mine kicks around 200

 

that would be great if my gauge is off by 10f