90gs

I have a 92 cx with a jdm b16 in it (cx radiator... 50k miles on the swap)

i was going on a long drive today and its hot as **** so i checked coolant levels, it looked a little low so i filled it to about an inch from the top

i noticed it was starting to overheat when i would go over 70mph... i could rev high light to light but on the freeway it would overheat if i went up hills or faster than 70mph..

then when i got home i thought i maybe overfilled it, so i look, and sure enough i see the "max" line and its about 2 inches above it.

do you guys think that would cause it to overheat or is it that the cx radiator isnt enough for the b16?

neutron91

check the thermostat... maybe a clogged hose or radiator... the cx rad is enough to cool the b16

90gs

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by neutron91 &raquo;</TD></TR><TR><TD CLASS="quote">check the thermostat... maybe a clogged hose or radiator... the cx rad is enough to cool the b16</TD></TR></TABLE>

even in like 95 degree weather?

swap only has 50k on it... i wouldnt think the thermo would go bad that fast

can overfilling the overflow make it overheat? if so ill try that first

you think changing a thermostat on a b16 would be easier than a d16y8 (? 94ex) with an automatic. my sister has an automatic 94 ex and theres some gay solid metal tubes that are in the way and i couldnt get to it

neutron91

excessive heat can cause a thermostat to stick open/closed... just cause its fairly new i wouldnt rule it out

90gs

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by neutron91 &raquo;</TD></TR><TR><TD CLASS="quote">excessive heat can cause a thermostat to stick open/closed... just cause its fairly new i wouldnt rule it out</TD></TR></TABLE>

gotcha... thermostat is under where the lower radiator hose connects to the block, right?

could it possibly be the overfilled overflow though?

edo3276

do a block test...the overflow tank fills up when there is pressure in the radiator from exhaust gas leaking from the cylinders to the coolant. could be headgasket

paulbeezie

My jdm B16 overheated 5 minutes after start up. Impeller on water pump was rusted to nothing. 36k my a$$.

paulbeezie

Plus the CX radiator was not cuttin it.

90gs

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by edo3276 &raquo;</TD></TR><TR><TD CLASS="quote">do a block test...the overflow tank fills up when there is pressure in the radiator from exhaust gas leaking from the cylinders to the coolant. could be headgasket</TD></TR></TABLE>

i doubt its that...

i let it sit for a long time and it didnt overheat... its colder now though than when it was overheating

earlier today when it was super hot (like 95) i was going fast light to light and it wouldnt overheat... but when i got on the freeway it would... like sustained midrange rpm did it.

i could rev to 8k light to light and it was fine, sustained 3k on the freeway was fine, but sustained 4k on the freeway made it overheat... i didnt try sustained 4k in the city, just 3k like usual...

90gs

bump

90gs

to the top

All95

Have you changed the t-stat yet? My friend had similiar conditions , and that cleared it right up

Status Sean

edo3276

block test is not that hard....just put the blue liquid in the transparent siphon tool...and siphon the air coming from the radiator cap....if the blue liquid changes color....theres exhaust gas leaking into the cooling system. i think it would be wise to do it since second guessing is not going to do better.

TurboEG215

i would suggest the themostat first and if not try bleeding the system if thier is air trapped in thier it would overheat and did u check to see if ur coolng fans are coming on and also check ur radaor cap

90gs

radiator cap is spoon

fans work too... i could always jumper the switch so they're always on...

the other day i just opened the drain plug for a sec and drained some out (cuz i overfilled the overflow) and its been fine since... i drove the hell out of it testing it too. going 70+ before would make it overheat... i went 100 for a little bit, then sustained 80, and it was fine... it was a hotter day too

StreetEG

also make sure you bleed it properly... air bubbles almost destroyed my ****

arielb1

my 2 cents

When the engine is cold, remove the radiator cap. Start the engine. See if the water is circulating in the rad with the cap off. I know it is hard to tell, but if you observe, you will be able to. BTW, water will circulate only after the engine warms up and the thermostat opens. This proceedure will accomplish two things; if the water is circulating (with engine warm), the thermostat works and you wil bleed your system of air especially if you dont have a bleed screw on the thermostat housing. You rad fan should come on shortly to cool engine as well.

Overfilling the reserviour container will not cause this problem. The overfill will just go out the overfill tube.

One other test other than the block test. With your engine temperature gauge high (engine overheating), turn off your engine. Open your coolant reserviour (NOT YOUR RADIATOR CAP), see if bubbles are coming out of you tubing that dips into the water. If it is bubbling, I found that more than likely it is a head gasket.

Last, look under your water pump ( you have to crawl under your car) and locate the overfill bleed valve. If coolant is tearing out, then your water pump could be hosed.

Been here, done this, good luck and have fun.

Just my two cents...

SoSlo

the exact same thing happened to a friends jdm gsr and after replacing the water pump and t-stat which did not fix the problem he did the head gasket which fixed it. teh only tim his car would overheat was on the freeway

90gs

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SoSlo &raquo;</TD></TR><TR><TD CLASS="quote">the exact same thing happened to a friends jdm gsr and after replacing the water pump and t-stat which did not fix the problem he did the head gasket which fixed it. teh only tim his car would overheat was on the freeway</TD></TR></TABLE>

did it do it often? i've only gone on the freeway twice, recently, the first time it did, and the more recent time it didnt

90gs

bump

95DxSi-R2

probably clogged radiator, i use a hand held laser style thermometer to check them, good luck

EvilPinkEye

Im having the same god-damn problem with my damn d16y8, go the stock DX radiator.
I beat on it, it dont over-heat..say on the high way at 70+ heats up a bit...

93_eghatch

I had that same problem on my Eg. I took it in and they told me that I needed a new thermostat. That didn't fix it, so they then told me that i needed a new radiator. That fixed the problem. About a week later, it turned out that I overheated my engine too many times and blew my head gasket and warped my engine block.

mordezmoncou

Yes over filling the overflow will cause overheat.
Never put water in the overflow
its called and overfow for a reason.
drain the water out and only put water in ure radiator.
also if you have air pockets in your radiator that will cause an overheat.
thermostat might help too. get a new one to be safe, they are cheap, like 6$
go to advanced autoparts or autozone.
hope this helps