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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars |
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07-07-2018, 08:17 PM | #1 |
Zilvia Member
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strangest overheating issue
before you say use the search tool trust me ive searched every forum out there and cant find a similar issue.
so im having an issue where anytime i take it on the highway i start to overheat. i can drive it around town all day and no issues but as soon as i hit the highway it gets real hot. i did notice due to a hot ambient temperature it would overheat more quickly (probably doesnt matter but just thought i should say it). if i pull over and wait like not even 5 minutes itll cool down all the way but as soon as i start driving it again. i can drive it around town all day but i cant go a constant speed without stops. i also beat on the car a little and have no issues. i check the coolant cap and so far no whiteness. i also bled the system very well for a solid 20-30 minutes with my coolant funnel. i have a BRAND new ISR Radiator ISR Fan shroud with fans. and before you ask no they are not wired backwards, i have them behind the radiator pulling air. so far i replaced the thermostat, and looped the heater core line because i thought the kink caused issues. heres some pictures that might help you help me diagnose the issue. water pump doesnt leak or make strange noises but that is on the list of things to be replaced, along with a coolant flush (even though the coolant is not even a year old and has barely any use on it.) https://imgur.com/gallery/hxPweOo Last edited by oLemurs; 07-09-2018 at 10:33 AM.. |
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07-08-2018, 08:55 AM | #2 |
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If you are going to go through the trouble of telling us not to telll you to search. Do us a favor and list all the important things and their results too.
1. Have you confirmed your fans are working correctly? 2. Have you REALLY bled your cooling system to make sure there is no air? For some people, they have a hard time getting the last bit of air out on these cars. 3. Did you install the thermostat correctly? They are directional and you need the jiggle valve positioned at 12 o'clock. 4. When the car warms up, is the upper radiator hose cool or warm? is the bottom hose cool or warm? 5. Have you replaced the radiator cap? 6. Can you see the coolant flowing when you let your car warm up from idle and remove the radiator cap? (it wont move while cold), to confirm the thermostat is opening? Use all the questions normally asked in the other threads you searched, to give us info in this thread to help out
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07-08-2018, 09:04 AM | #3 | |
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Quote:
1. they work correctly i shut them off while overheating and it spiked bad. oh yea forgot to mention i have them wired up to a switch on individual relays. 2. ill try to re bleed it and jack up the front end again 3. jiggle valve is directly at the top 4. both of the hoses are very hot 5. i have not but this is the one that came with the radiator. its 1.1 bar 6. i know the thermostat is opening because the same thing happened with my last one and i put the old one in boiling water. Last edited by oLemurs; 07-08-2018 at 09:49 AM.. |
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07-08-2018, 01:56 PM | #4 |
Zilvia Junkie
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Is the cap sealing properly with the radiator? Had same thing happen on another car, but with OEM radiator. The ledge the cap sits on was slightly eroded, so when the pressure would rise up it wouldn't hold and thus not cool properly. Never leaked either which puzzled the crap out of me.
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07-08-2018, 07:41 PM | #5 | |
Zilvia Member
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07-09-2018, 10:35 AM | #7 |
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07-09-2018, 08:04 AM | #8 |
Nissanaholic!
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I had something similar, it was a pin hole in a hose under intake manifold. Finally found it. Would only have enough pressure to leak when hot
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07-09-2018, 10:35 AM | #9 |
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good idea, im going to be re doing all the hoses under the intake manifold since some of them are still the original ones.
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07-29-2018, 03:19 AM | #10 |
I was just wondering where you got the hoses? I’m looking online to fine one specific hose that seems to have a bend right where it connects. got the feeling if I use s flexible hose it might pinch and the coolant won’t flow
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07-29-2018, 09:34 PM | #11 |
Zilvia Member
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which one man? heater core hoses need to be 3/4" in diameter and look for non kinking lines, all of the smaller coolant hoses are 5/16 and none of them will kink.
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07-09-2018, 08:31 AM | #12 |
Nissanaholic!
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utilize the return key once in a while, so I can actually read the post.
Then I'll probably try and help.
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07-09-2018, 10:55 AM | #14 |
Nissanaholic!
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you sure water pump is good? I have seen them where the fins are literally gone from years of corrosion.
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07-09-2018, 11:46 AM | #15 |
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07-09-2018, 12:59 PM | #16 | |
Nissanaholic!
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But I'll never forget the waterpump this guy brought in. The fins/blades were paper thin, like tin foil. I mean, was the guy running salt water in the fucking radiator? I cannot view imgur so idk what that pic is. what motor you got? SR? my initial thought, and why I asked if you have actually looked at the pump, is that you aren't flowing enough water. At higher RPM you generate more heat, and water pump turns faster to compensate. But when you are at higher rpm the engine cant cool quick enough. this makes me think water flow. Have you flushed the system? old hoses, could have blockage? Fresh new coolant to go with with ur new rad?
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07-09-2018, 08:02 PM | #17 | |
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07-09-2018, 01:44 PM | #18 |
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Define overheat? What temps? Or is this just the stock gauge? How old is the temp sensor?
It kind of sounds like an airflow problem. If I understand, you have beat on it at low speeds and it was fine. As in you've been higher in the RPMs at low speeds, but once you get up to 65+ it starts overheating? Is there any blockage in front of the radiator, or do you still have an AC condenser.
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07-09-2018, 07:59 PM | #19 | |
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07-10-2018, 06:54 AM | #20 |
Nissanaholic!
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Hold the phone.
170 is COLD. 'Define overheat? What temps? Or is this just the stock gauge? How old is the temp sensor? '
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@UpshiftEngineering |
07-10-2018, 07:28 AM | #21 |
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Ya what? For summer time, especially considering its been the hottest all year that temp is cold. Overheating is around 230.
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07-10-2018, 11:33 AM | #22 |
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07-10-2018, 01:26 PM | #24 |
Nissanaholic!
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some background knowledge for ya, you can find actual science for this shit...here's the concept.
water boils at 212 degrees freedom water under pressure, such as in a cooling system, boils at some temp above 212 coolant boils at some temp higher than water therefore - coolant under pressure boils at a temp higher than regular ass water. under 200 is too cold. 200 is fine. 220 is getting hot. 230 is too hot.
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@UpshiftEngineering |
07-10-2018, 02:45 PM | #25 |
Zilvia FREAK!
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Shit my 1J spiked at 250 at the track last hot lap event. My last SR never let it past 230 in fear of warping the head. where do you have your aftermarket temp gauge reading from? is the temp sensor properly grounded with NO teflon?
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07-27-2018, 01:36 PM | #27 |
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ok guys i just installed a new coolant temp sensor. on the short drives it was getting to be about 210 before i pulled over yet the stock temp sensor was just in the middle i really dont know what to believe now also when i went up a giant hill it was hitting almost 220 which and the factory sensor was still sitting in the middle. i really dont know what to believe at this point but if my glow shift gauge is correct than i definately went over 230 degrees and at that point is it even worth rebuilding a stock sr when i can just get a new one for 2600? im afraid the head might have warped. i went through all of the coolant lines and replaced them along with an s15 water neck to run stainless turbo coolant lines.
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07-27-2018, 05:30 PM | #30 |
Zilvia Member
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alright so heres what im thinking, its either a slightly bad headgasket (or warped head), the turbo is burning some of the coolant (would make sense because last owner "rebuilt" it and he wasnt the sharpest tool in the shed) OR the FMIC is blocking alot of the air flow to the radiator. what im going to do is take out the SR and sell it. jk but im going to check for carbon in the coolant, if not that then get a legit koyorad instead of this isr bullshit and if im still having issues im going to jump off a cliff
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