overheating slut!! - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

trybal · 09-06-2006, 09:49 PM

Blah, ive tried searching with not luck

-sr redtop
-sr radiator
-stock sidemount without proper circulation but wheel liner removed

Just got my car back from the shop, had a cometic hg and arp's installed..

car started overheating on the drive home from shop on the freeway, so i rebled the radiator and all was fine. I didn't drive it much though.

Well now on the freeway it will be fine for 15-20 minutes of driving.. then it will start to rise in temp and won't stop untill i crank the heat. then it goes back to medium. Heat blows hot so i don't think its an airbubble problem. I tried to rebleed and no air comes outta the bleed hole..

I tried to change the mech fan out for a e-fan and no luck. Also, yesterday after the car got hot and i cranked the heat to drop it. I let the car idle for 15-20 minutes with the heat off and it didn't get above 1/2. Untill a few minutes after i started driving it again..

any ideas?

-i bled the rad a few times
-tried new fans
-overflow tank is full like i left it
-does not boil
-feels really hot under the hood
-tried different cap
-not losing coolant

-thermostat maybe?
-clogged radiator?

holybushoffire · 09-06-2006, 10:13 PM

change your thermostat, and if that doesn't help drill an extra 1/8 in. hole into the thermostat. That will allow better flow and won't decrease the operating temp of the thermsotat.

vutony · 09-06-2006, 10:36 PM

maybe water pump ??

is the lower rad hose hot or cold

trybal · 09-06-2006, 10:40 PM

when it just gets up to op temp its cold but after a good ol freeway drive and overheating its just as hot as the upper

sw20>>s14 · 09-07-2006, 01:46 AM

the lower shouldnt be as hot as the upper...if the lower isnt cold to touch then your t-stat is functioning...my guess would be a clogged/rusted to hell rad...

LB.Motoring · 09-07-2006, 01:49 AM

would invest in a koyo rad. would be way worth the money, esp. in your case. the better cooled the motor, the better and longer it should last you. GL

EchoOfSilence · 09-07-2006, 02:51 AM

Yup. check thermostat, check hoses, check rad.

and griffin > koyo.

dopeassjackson · 09-07-2006, 06:25 AM

by you turning on the heat in your car and that making all the diferance i bet its your rad. try this take you car for a drive around town for about 20 min. take a thermometer and insert it at difrent points on the rad and if theres a temp drop one spot of the rad is doing more cooling than the other.

carkid0007 · 09-07-2006, 05:18 PM

I had the same problem and I just got a koyo and also changed the thermo while I was in there and havnt had a problem since...

09-06-2006, 09:49 PM	#1
trybal Zilvia Junkie Join Date: Nov 2005 Location: Seattle wa Posts: 299 Trader Rating: (0) Feedback Score: 0 reviews	overheating slut!! Blah, ive tried searching with not luck -sr redtop -sr radiator -stock sidemount without proper circulation but wheel liner removed Just got my car back from the shop, had a cometic hg and arp's installed.. car started overheating on the drive home from shop on the freeway, so i rebled the radiator and all was fine. I didn't drive it much though. Well now on the freeway it will be fine for 15-20 minutes of driving.. then it will start to rise in temp and won't stop untill i crank the heat. then it goes back to medium. Heat blows hot so i don't think its an airbubble problem. I tried to rebleed and no air comes outta the bleed hole.. I tried to change the mech fan out for a e-fan and no luck. Also, yesterday after the car got hot and i cranked the heat to drop it. I let the car idle for 15-20 minutes with the heat off and it didn't get above 1/2. Untill a few minutes after i started driving it again.. any ideas? -i bled the rad a few times -tried new fans -overflow tank is full like i left it -does not boil -feels really hot under the hood -tried different cap -not losing coolant -thermostat maybe? -clogged radiator?

09-06-2006, 10:36 PM	#3
vutony Post Whore! Join Date: Jul 2005 Location: (714) OC area Posts: 5,273 Trader Rating: (145) Feedback Score: 145 reviews	maybe water pump ?? is the lower rad hose hot or cold __________________ i have engine hoist for rent i do SR wiring

09-07-2006, 01:46 AM	#5
sw20>>s14 Post Whore! Join Date: Jan 2005 Location: bay area Posts: 5,656 Trader Rating: (19) Feedback Score: 19 reviews	the lower shouldnt be as hot as the upper...if the lower isnt cold to touch then your t-stat is functioning...my guess would be a clogged/rusted to hell rad... __________________ s14\| y34\| 911 gts\| exige s\| 600rr\| r3\| 250r\| 85 girlfriend

09-07-2006, 01:49 AM	#6
LB.Motoring Post Whore! Join Date: Jul 2006 Location: SòCal♥ Age: 38 Posts: 5,840 Trader Rating: (1) Rides Gallery: LB.Motoring Feedback Score: 1 reviews	would invest in a koyo rad. would be way worth the money, esp. in your case. the better cooled the motor, the better and longer it should last you. GL __________________ Robby Leuer

09-07-2006, 02:51 AM	#7
EchoOfSilence Nissanaholic! Join Date: Aug 2003 Location: Los Angeles/Berkeley, CA Posts: 2,238 Trader Rating: (1) Feedback Score: 1 reviews	Yup. check thermostat, check hoses, check rad. and griffin > koyo. __________________ Petition Nissan to Make the IDx on http://IDxClub.co !

09-06-2006, 10:13 PM	#2
holybushoffire Zilvia Junkie Join Date: Jul 2005 Location: NorCal Posts: 580 Trader Rating: (5) Feedback Score: 5 reviews	change your thermostat, and if that doesn't help drill an extra 1/8 in. hole into the thermostat. That will allow better flow and won't decrease the operating temp of the thermsotat.

09-06-2006, 10:40 PM	#4
trybal Zilvia Junkie Join Date: Nov 2005 Location: Seattle wa Posts: 299 Trader Rating: (0) Feedback Score: 0 reviews	when it just gets up to op temp its cold but after a good ol freeway drive and overheating its just as hot as the upper

09-07-2006, 06:25 AM	#8
dopeassjackson Zilvia Member Join Date: Oct 2005 Location: stone ridge NY Posts: 150 Trader Rating: (0) Feedback Score: 0 reviews	by you turning on the heat in your car and that making all the diferance i bet its your rad. try this take you car for a drive around town for about 20 min. take a thermometer and insert it at difrent points on the rad and if theres a temp drop one spot of the rad is doing more cooling than the other.

09-07-2006, 05:18 PM	#9
carkid0007 Zilvia Junkie Join Date: Aug 2002 Location: Ohio Age: 40 Posts: 497 Trader Rating: (1) Feedback Score: 1 reviews	I had the same problem and I just got a koyo and also changed the thermo while I was in there and havnt had a problem since...