Weird overheating issue KA24DE - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

jdm_s14_zenki · 03-23-2007, 10:28 PM

So i just picked up this S13. Runs good and fine and everything, but today when i was driving, seems when i give it alot of gas, my temp gauge goes up. and wants to overheat. not sure whats going on but so far ive done:

checked water. good
no leaks.
thermastat SEEMS to be working, both hoses are hot.
I have a koyo alum. radiator with clutch fan, no fan shroud though.

I can drive all day long without it overheating, its just when i floor it, it gets hot. then if i stop flooring it, it goes back to normal.

I did cut the top radiator hose to shorten it because it was too long...some water spilled out, but i replaced the water...i dont think thats the problem..

any ideas would be cool. thanks.

s14dude · 03-23-2007, 10:32 PM

try bleeding the system. since you had water leak out and cut the hose there may be air in the system.

try that first, that should solve it.

jdm_s14_zenki · 03-23-2007, 10:36 PM

ya i figured it might be that , but i shortened the top hose...so i didnt think it would need bleeding. i'll bleed it anyways though. i'll post the results when im done.

s13gold · 03-23-2007, 11:31 PM

might also be thermostat.

pr0ject TRUENO · 03-24-2007, 01:44 AM

where do you live? so cal? just take your thermostat out. then flush the whole system, refill so theres no air bubbles.

jdm_s14_zenki · 03-24-2007, 04:58 AM

well, i ran the car, tried to get the air bubbles out. a few air bubbles came out. i punched it quite a bit tonite, temp stayed normal. but i'lll try again when its warmer outside tomorrow. if that works then, cool.

SimpleSexy180 · 03-24-2007, 05:17 AM

radiator cap. sounds like your not getting enough pressure in the system.

b2oopie · 03-24-2007, 06:59 AM

mine is doin samething, damn thing

g6civcx · 03-24-2007, 07:12 AM

Don't trust the stock coolant temperature gauge. It's not accurate. You need a real temperature probe to display the exact temperature.

You need to pressure test the entire cooling system, including the cap. Then check the thermostat. The upper hose should be slightly warmer than the lower hose.

Then make sure you bleed well.

The last thing I would consider is something wrong with the water pump, or if you have rust/clog inside thd coolant passages.

ladiesman8527 · 03-24-2007, 07:57 AM

clutch fan with no fan shroud is practically useless. you really need a fan shroud. i forget the exact number and im sure it varies, but the average clutch fan with no shroud is like ~70% less functional than a fan with a shroud.

SimpleSexy180 · 03-24-2007, 11:02 AM

i have ran my ka without a shroud for a long time and i never experienced overheating problems because of it.

atleast im sure his problem at the moment is not the fan shroud causing the overheating.

jdm_s14_zenki · 03-24-2007, 01:50 PM

im kinda leaning towards the radiator cap...because when i got the car a few days ago...everything was fine...but then i popped the radiator cap...and, thats when it started...the cap doesnt seem like its on right...know what i mean? just doesnt feel like it should...i'll try that.

*wangan_cruiser* · 03-24-2007, 09:33 PM

check your thermostat. since u r about to fix it. you need to bleed it, take your thermostat off then get stainless bowl put some water in it then put the thermostat and boil it so you can see if your thermostat opens up when it heats up. id recommend buy a new thermostat haha

when u checked your thermostat reseal the thermostat housing with a new sealant and do your water pump too. check the waterpump for any freeplay with it. when your waterpump is shot it adds up for having intermittent overheating because the coolant flow and its not making any pressure when your waterpump is fckd up. then buy new hoses and fresh coolant since you are on it.

when u bleed jack your car as high as you can then take off the radiator cap, start your car and let it run for 15 mins. let the air bubbles burp. keep filling it up until your car wont overheat. just make sure u dont have a leak. if its doable you can replace your rad cap also

jdm_s14_zenki · 03-25-2007, 05:07 AM

thanks for the tips man, i was driving around after i bleed the radiator...only a few burps but not much water needed to be added. no problems yet, but when i punch it a little, i can smell coolant when im at a light. not alot of coolant smell, but i can smell it. im thinking maybe a small pressure leak, and i think the cap might be the culprit. the hoses are on nice and tight so...i guess we'll see..

s14dude · 03-25-2007, 02:07 PM

yup. sounds like you might have a problem with that cap. i got 2 extras if you need one. i think im just down the street from you too. lmk.

fridaytech · 03-25-2007, 06:21 PM

too bleed air out of the system properly buy a tool like in the pic below. very inexpensive. works wonders

jdm_s14_zenki · 03-26-2007, 03:45 AM

fixed. swapped a radiator cap with my other 240...no more probs, but not i need another radiator cap to replace it so i'll pick it up from s14 dude. thanks man/

s14dude · 03-26-2007, 10:28 AM

np dude. PM'd you. come pick it up whenever...im home after 6.

jdm_s14_zenki · 04-04-2007, 09:40 PM

fixed the problem, it was a bad fan belt.

03-23-2007, 10:28 PM	#1
jdm_s14_zenki Zilvia Addict Join Date: Jan 2006 Location: Orange County Posts: 703 Trader Rating: (1) Feedback Score: 1 reviews	Weird overheating issue KA24DE So i just picked up this S13. Runs good and fine and everything, but today when i was driving, seems when i give it alot of gas, my temp gauge goes up. and wants to overheat. not sure whats going on but so far ive done: checked water. good no leaks. thermastat SEEMS to be working, both hoses are hot. I have a koyo alum. radiator with clutch fan, no fan shroud though. I can drive all day long without it overheating, its just when i floor it, it gets hot. then if i stop flooring it, it goes back to normal. I did cut the top radiator hose to shorten it because it was too long...some water spilled out, but i replaced the water...i dont think thats the problem.. any ideas would be cool. thanks.

03-23-2007, 10:32 PM	#2
s14dude Zilvia Junkie Join Date: Sep 2004 Location: Costa Mesa, CA Posts: 553 Trader Rating: (6) Rides Gallery: s14dude Feedback Score: 6 reviews	try bleeding the system. since you had water leak out and cut the hose there may be air in the system. try that first, that should solve it. __________________

03-25-2007, 02:07 PM	#15
s14dude Zilvia Junkie Join Date: Sep 2004 Location: Costa Mesa, CA Posts: 553 Trader Rating: (6) Rides Gallery: s14dude Feedback Score: 6 reviews	yup. sounds like you might have a problem with that cap. i got 2 extras if you need one. i think im just down the street from you too. lmk. __________________

03-26-2007, 10:28 AM	#18
s14dude Zilvia Junkie Join Date: Sep 2004 Location: Costa Mesa, CA Posts: 553 Trader Rating: (6) Rides Gallery: s14dude Feedback Score: 6 reviews	np dude. PM'd you. come pick it up whenever...im home after 6. __________________

03-23-2007, 10:36 PM	#3
jdm_s14_zenki Zilvia Addict Join Date: Jan 2006 Location: Orange County Posts: 703 Trader Rating: (1) Feedback Score: 1 reviews	ya i figured it might be that , but i shortened the top hose...so i didnt think it would need bleeding. i'll bleed it anyways though. i'll post the results when im done.

03-23-2007, 11:31 PM	#4
s13gold Post Whore! Join Date: Jan 2007 Location: CARSON Posts: 4,240 Trader Rating: (79) Feedback Score: 79 reviews	might also be thermostat.

03-24-2007, 01:44 AM	#5
pr0ject TRUENO Zilvia FREAK! Join Date: Jun 2004 Location: san jose CA Posts: 1,012 Trader Rating: (1) Feedback Score: 1 reviews	where do you live? so cal? just take your thermostat out. then flush the whole system, refill so theres no air bubbles.

03-24-2007, 04:58 AM	#6
jdm_s14_zenki Zilvia Addict Join Date: Jan 2006 Location: Orange County Posts: 703 Trader Rating: (1) Feedback Score: 1 reviews	well, i ran the car, tried to get the air bubbles out. a few air bubbles came out. i punched it quite a bit tonite, temp stayed normal. but i'lll try again when its warmer outside tomorrow. if that works then, cool.

03-24-2007, 05:17 AM	#7
SimpleSexy180 Post Whore! Join Date: Aug 2004 Location: Cal Posts: 4,750 Trader Rating: (8) Rides Gallery: SimpleSexy180 Feedback Score: 8 reviews	radiator cap. sounds like your not getting enough pressure in the system.

03-24-2007, 06:59 AM	#8
b2oopie Join Date: Mar 2007 Location: TN Age: 38 Posts: 1 Trader Rating: (0) Feedback Score: 0 reviews	mine is doin samething, damn thing

03-24-2007, 07:12 AM	#9
g6civcx Post Whore! Join Date: Apr 2004 Location: Virginia, USA Posts: 5,764 Trader Rating: (5) Feedback Score: 5 reviews	Don't trust the stock coolant temperature gauge. It's not accurate. You need a real temperature probe to display the exact temperature. You need to pressure test the entire cooling system, including the cap. Then check the thermostat. The upper hose should be slightly warmer than the lower hose. Then make sure you bleed well. The last thing I would consider is something wrong with the water pump, or if you have rust/clog inside thd coolant passages.

03-24-2007, 07:57 AM	#10
ladiesman8527 Zilvia Junkie Join Date: Dec 2005 Location: Collierville, TN Age: 38 Posts: 429 Trader Rating: (0) Feedback Score: 0 reviews	clutch fan with no fan shroud is practically useless. you really need a fan shroud. i forget the exact number and im sure it varies, but the average clutch fan with no shroud is like ~70% less functional than a fan with a shroud.

03-24-2007, 11:02 AM	#11
SimpleSexy180 Post Whore! Join Date: Aug 2004 Location: Cal Posts: 4,750 Trader Rating: (8) Rides Gallery: SimpleSexy180 Feedback Score: 8 reviews	i have ran my ka without a shroud for a long time and i never experienced overheating problems because of it. atleast im sure his problem at the moment is not the fan shroud causing the overheating.

03-24-2007, 01:50 PM	#12
jdm_s14_zenki Zilvia Addict Join Date: Jan 2006 Location: Orange County Posts: 703 Trader Rating: (1) Feedback Score: 1 reviews	im kinda leaning towards the radiator cap...because when i got the car a few days ago...everything was fine...but then i popped the radiator cap...and, thats when it started...the cap doesnt seem like its on right...know what i mean? just doesnt feel like it should...i'll try that.

03-24-2007, 09:33 PM	#13
wangan_cruiser kouki man Join Date: Apr 2006 Location: downtown oakland,ca Age: 40 Posts: 3,539 Trader Rating: (36) Feedback Score: 36 reviews	check your thermostat. since u r about to fix it. you need to bleed it, take your thermostat off then get stainless bowl put some water in it then put the thermostat and boil it so you can see if your thermostat opens up when it heats up. id recommend buy a new thermostat haha when u checked your thermostat reseal the thermostat housing with a new sealant and do your water pump too. check the waterpump for any freeplay with it. when your waterpump is shot it adds up for having intermittent overheating because the coolant flow and its not making any pressure when your waterpump is fckd up. then buy new hoses and fresh coolant since you are on it. when u bleed jack your car as high as you can then take off the radiator cap, start your car and let it run for 15 mins. let the air bubbles burp. keep filling it up until your car wont overheat. just make sure u dont have a leak. if its doable you can replace your rad cap also

03-25-2007, 05:07 AM	#14
jdm_s14_zenki Zilvia Addict Join Date: Jan 2006 Location: Orange County Posts: 703 Trader Rating: (1) Feedback Score: 1 reviews	thanks for the tips man, i was driving around after i bleed the radiator...only a few burps but not much water needed to be added. no problems yet, but when i punch it a little, i can smell coolant when im at a light. not alot of coolant smell, but i can smell it. im thinking maybe a small pressure leak, and i think the cap might be the culprit. the hoses are on nice and tight so...i guess we'll see..

03-25-2007, 06:21 PM	#16
fridaytech Leaky Injector Join Date: Oct 2006 Location: orange ca Age: 43 Posts: 74 Trader Rating: (0) Feedback Score: 0 reviews	too bleed air out of the system properly buy a tool like in the pic below. very inexpensive. works wonders

03-26-2007, 03:45 AM	#17
jdm_s14_zenki Zilvia Addict Join Date: Jan 2006 Location: Orange County Posts: 703 Trader Rating: (1) Feedback Score: 1 reviews	fixed. swapped a radiator cap with my other 240...no more probs, but not i need another radiator cap to replace it so i'll pick it up from s14 dude. thanks man/

04-04-2007, 09:40 PM	#19
jdm_s14_zenki Zilvia Addict Join Date: Jan 2006 Location: Orange County Posts: 703 Trader Rating: (1) Feedback Score: 1 reviews	fixed the problem, it was a bad fan belt.