keMz

my s13 sr20det over heats but doesnt peg unless the heater is on. even when the heater is on the temp might climb a bit under load. (up hill)

koyo rad nflow
flex-a-lite dual fans r210
no thermostat (im in hawaii so its not necessary, should actually keep car colder)
samco bottom hose
custom top hose
hks rad cap
s14 pump (waiting for a bnib s13 pump to arrive to try that)

curious what the problem might be...

tried bleeding system, flushing system, and even ran car with top rad hose off and the water pumps then stops, then pumps, then stops... its not constant.

when the heater is off the car gets warm super fast and has a higher chance of having issues.

just curious if anyone had a similiar problem... i was having electrical issues which was melting fuses but i think its fixed now that my fans are ran separate. 1 for a/c and 1 for thermostat control which both are wired with relays and independant grounds.

thanks in advance.

Pro ViZIon

With all that I'd say it would need to be bled.

When you tried to bleed the system did you have the heater set to full heat?

What are your fans controlled using?

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KiLLeR2001

I'm in Florida and I have a thermostat. You need a thermostat, so install one. Also sounds like your water pump isn't working, replace it. Get the S14 SR20DET water pump, it's a better flow design.

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AsleepAltima

yeah gotta agree. replace the thermostat, have the cap tested, replace the water pump. with no thermostat in, there should have been a constant flow of fluid no matter what. also, do you have those fans wired to run constantly or are they on a relay?

keMz

1 fan is thermo controlled inserted top battery side of the koyo rad
1 fan is always on with a/c but obviously i havent been running a/c cause i have to have the heater open.

both fans have 1 relay ea.

s13 pump should almost be here and going try swap that with new coolant and bleed air but if that doesnt fix it then i can only assume the radiator??

Silvia352

A thermo. is needed, there is no restriction in the cooling system as well.


Are you using the bleeder bolt? And crank the heat all the way up when bleeding.


Isn't there a difference in pumps or is that only in sr's something about the neck length.

godrifttoday

or a warped head maybe because it over-heated before? or bad head gasket... what u can try doing is taking of the radiator and flush it with the hose until it runs clear. flush out your motor too u can do this by running the hose into the upper raditor hose and letting it run out through the bottom... it could help, helped my buddy

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keMz

1. none of our cars ever had thermo cause hawaii temp.
2. jack car up, make shift bottle with tape wrapped to make good seal, then run the car with heater open and turned all the way up until bubbles stop right?
3. yes the s14 housing is different but they still say its an upgrade... makes no sense to me..

keMz

im hoping theres no damage to the head.

im going change my oil soon i guess to see but pretty sure theres no coolant in the oil pan.

we flushed it and it seems to work but only underload the temp will act funny.

im hoping its a timing issue... when we swap pumps and coolant il try double check the timing...

AsleepAltima

since when does temp matter? i lived in az - had a thermostat. hawaii is NOT hotter than az. living now in ny - again, have a thermostat. hawaii is NOT colder than ny. your reasoning is unreasonable. your ecu partially relies on temp to do its job correctly.

keMz

changed waterpump, bleed the air, shot timing and still the temp rises when you putting load on the engine like driving up hill

AsleepAltima

Your radiator sounds clogged. Physically feel it for cold spots when its at operating temp.

keMz

il check that out but i had the radiator out and i had the hose in the top and pushed water thru it, then switched and repeated that... seemed to flow ok but every idea is worth a second look

Mishkin_707

Really? I lived in California and I had a thermostat, then lived in Chicago and still had a thermostat.

Just because the weather is sexy in Hawaii, doesn't mean it's sexy to run NO thermostat.

OP, I'm sure you're not running an intercooler either? You know, cause Hawaii temps?

Put a damn thermostat in there before you start warping the head and blow the headgasket, what's wrong with you? Seriously what are you goig to lose by installing one? $20?

Just install it, because I'm sure that head is warping as it "warms at load" and your ass is going to be sitting there scratching you head and thinking of this thread where people are telling you to put one in.

fliprayzin240sx

You need a thermo. You're not letting the coolant to sit in the radiator long enough to cool down. Also, slap the stock shroud and stock clutch fan, you'd be surprised how much cooler your car would run with it on. If you're adamant on not running a thermo, atleast slap a drilled out/modded stock thermo.

I've had this same exact issues in Okinawa with my S14. I was running a colder thermo with E-fans and my temp would creep up to 100 when I'm stuck in traffic. Slapped the stock cooling setup and it I never saw my temp go about 80 while just daily driving it with the AC on.

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iveexcaped3

rinse the outter part of the radi too, i did that on mine rinsed out all the fins you be surpised how much dirt builds up in there and restricts simple air flow

keMz

well at this point im trying anything so ya i might just slap the thermostat back in there just to see but logically if you look up what a thermostat's job is then you will realize that im scratching my head while i read some of this crazy comments... unless my head is warped then obviously i lose.

iveexcaped3

Technically you don't, it helps your car warm up faster then when it hits the temp it opens up and let's the fluid pass through, I've never ran one in so cal but doesn't hurt to try. It could be clogged some where or your wp isn't flowing the fluid through the block. Is your temp sensor bad? Flush it like they said earlier and slap on the new wp and let us know.

keMz

i think the issue was because i had a custom mid mount + shroud that the radiator wasnt getting enough air and that was the reason the temp was going up and down under load...

ive only tested it a couple times but so far its great.

i did get a ka temp sensor since im using a ka cluster on my sr and i hope it reads way less at running temp but going to swap it this weekend.

iveexcaped3

Sounds like its time for a V mount lol

fliprayzin240sx

Man, I'm telling you...not running a thermo is a baaaaaad idea. Car doesnt get up to proper operating temp. Adds extra unneeded wear and tear on the engine.

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iveexcaped3

I'm not worried about mine I run single cam and can get motors for 100-200 so no thermo is no biggie to me when i go turbo you can bet your ace I'm running one.

keMz

UPDATE: Problem fixed, radiator wasnt getting enough air flow due to custom shroud. thanks zilvia!!

KiLLeR2001

Thanks for mentioning the custom shroud in your original post. Because that surely wasn't an important detail.

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Mishkin_707

Took the words right from me....lol

keMz

ya epic fail. im sorry for wasting many peoples time but i did appreciate all the help.