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

Spring Break '92 · 03-15-2011, 10:38 AM

I have a KA-T, and when I first start driving and the engine gets warm, the water temp starts to rise above normal, but only going uphill. When I turn on the heater and put the fan on full blast it goes down. Im thinking its just some air in the system. I opened the radiator cap when the car had been sitting overnight, and it had pressure in it that I released. I drove it afterward and it started doing the same thing. I let the pressure out after driving through the coolant bleed screw. Checked the oil, nothing abnormal. Not seeing anything in the coolant either. Could my HG be slightly leaking before the engine is up to full operating temp, or could my thermostat be going bad? The coolant temp sensor is fairly new and OEM.

*dawagarage* · 03-15-2011, 11:32 AM

since the issue is occuring only when you drive up hill, i too would believe its an air-bleeding issue.

have you bled the system with the front of the car elevated (i.e.- park uphill or jack the front end up)? this will cause those air bubbles to rise to the highest point and then escape

Spring Break '92 · 03-15-2011, 12:27 PM

Thats what I thought too. Suppose if what I did doesnt work I need to put the car up on my ramps and bleed it.

*dawagarage* · 03-15-2011, 12:41 PM

yeah man, thats the most efficient way to bleed the system. the KA is such a bitch. or if you have the money you should invest in swirl pot/breather tank.

definately worth the investment. gets rid of a lot of time/hassle.

Edwin562 · 03-15-2011, 12:43 PM

i love those breather tanks from PBM... looks dope and fuctional..

Corey121 · 03-15-2011, 09:33 PM

I had mine on ramps for 2 days bleeding the system was told when the thermo was in it over heated, come to found out they system was never bleed properly after bleeding it properly its never overheated.

Banana_Cute · 03-15-2011, 09:56 PM

just use a really tall funnel and fill it up with coolant over the radiator filler hole and let it idle with the heater on blast... keep adding coolant as it will bleed itself.

it'll take awhile, but i had the same problem when i change thermostat and pump..

but thats all i did..

Spring Break '92 · 03-16-2011, 02:05 AM

Quote:

Originally Posted by hotboiblaze

yeah man, thats the most efficient way to bleed the system. the KA is such a bitch. or if you have the money you should invest in swirl pot/breather tank.

definately worth the investment. gets rid of a lot of time/hassle.

Thanks for the responses. I had considered getting one of these PBM swirl tanks in the past, I think I will now. With one of these tanks, do they eliminate the need to ever have to bleed the system?

S-Nation S13 · 03-16-2011, 06:18 AM

park on hill, remove rad cap, start car, heater on blast, remove bleeder screw, and watch the bubbles come out from the bleeder screw, shake car, once you see coolant leak out and no bubbles....

close bleeder, turn off car, refill rad, and close rad. this is how ive been doing it. every now and then ill bleed it over again.

Spring Break '92 · 03-16-2011, 08:32 AM

Didnt even have to do anything else, issue is resolved.

S-Nation S13 · 03-16-2011, 09:50 AM

what was the problem?

*dawagarage* · 03-16-2011, 10:00 AM

Quote:

Originally Posted by Spring Break '92

Thanks for the responses. I had considered getting one of these PBM swirl tanks in the past, I think I will now. With one of these tanks, do they eliminate the need to ever have to bleed the system?

im glad your issue is resolved, tell us what was the matter.
but to anwer your question, yes the swirl pot pretty much constantly bleeds your system when your car is running. even though your issue is resolved i still recommend one for future issues ie replacing water pump, rad hose(s), general cavitation, etc

Spring Break '92 · 03-16-2011, 03:02 PM

Looks like the system just needed to burp thats all. Definitely going to install a swirl tank when I replace my hoses soon.

03-15-2011, 10:38 AM	#1
Spring Break '92 Zilvia Member Join Date: Dec 2007 Location: unconcious on Daytona Beach Posts: 180 Trader Rating: (1) Feedback Score: 1 reviews	KA overheating issue I have a KA-T, and when I first start driving and the engine gets warm, the water temp starts to rise above normal, but only going uphill. When I turn on the heater and put the fan on full blast it goes down. Im thinking its just some air in the system. I opened the radiator cap when the car had been sitting overnight, and it had pressure in it that I released. I drove it afterward and it started doing the same thing. I let the pressure out after driving through the coolant bleed screw. Checked the oil, nothing abnormal. Not seeing anything in the coolant either. Could my HG be slightly leaking before the engine is up to full operating temp, or could my thermostat be going bad? The coolant temp sensor is fairly new and OEM. __________________ BOOYAH! Last edited by Spring Break '92; 03-16-2011 at 02:03 AM..

03-15-2011, 12:27 PM	#3
Spring Break '92 Zilvia Member Join Date: Dec 2007 Location: unconcious on Daytona Beach Posts: 180 Trader Rating: (1) Feedback Score: 1 reviews	Thats what I thought too. Suppose if what I did doesnt work I need to put the car up on my ramps and bleed it. __________________ BOOYAH!

03-15-2011, 09:33 PM	#6
Corey121 Leaky Injector Join Date: Sep 2009 Location: North Carolina Age: 34 Posts: 82 Trader Rating: (0) Feedback Score: 0 reviews	I had mine on ramps for 2 days bleeding the system was told when the thermo was in it over heated, come to found out they system was never bleed properly after bleeding it properly its never overheated. __________________

03-15-2011, 09:56 PM	#7
Banana_Cute Zilvia FREAK! Join Date: Jan 2011 Location: Irvine, So. Cal. Posts: 1,338 Trader Rating: (16) Feedback Score: 16 reviews	just use a really tall funnel and fill it up with coolant over the radiator filler hole and let it idle with the heater on blast... keep adding coolant as it will bleed itself. it'll take awhile, but i had the same problem when i change thermostat and pump.. but thats all i did.. __________________ Simplicity is the key to brilliance

03-16-2011, 08:32 AM	#10
Spring Break '92 Zilvia Member Join Date: Dec 2007 Location: unconcious on Daytona Beach Posts: 180 Trader Rating: (1) Feedback Score: 1 reviews	Didnt even have to do anything else, issue is resolved. __________________ BOOYAH!

03-15-2011, 11:32 AM	#2
dawagarage Premium Member Join Date: Sep 2006 Location: Bremerton, WA Age: 36 Posts: 2,037 Trader Rating: (23) Feedback Score: 23 reviews	since the issue is occuring only when you drive up hill, i too would believe its an air-bleeding issue. have you bled the system with the front of the car elevated (i.e.- park uphill or jack the front end up)? this will cause those air bubbles to rise to the highest point and then escape

03-15-2011, 12:41 PM	#4
dawagarage Premium Member Join Date: Sep 2006 Location: Bremerton, WA Age: 36 Posts: 2,037 Trader Rating: (23) Feedback Score: 23 reviews	yeah man, thats the most efficient way to bleed the system. the KA is such a bitch. or if you have the money you should invest in swirl pot/breather tank. definately worth the investment. gets rid of a lot of time/hassle.

03-15-2011, 12:43 PM	#5
Edwin562 Post Whore! Join Date: Nov 2009 Location: Whittier (562) Age: 31 Posts: 4,721 Trader Rating: (35) Feedback Score: 35 reviews	i love those breather tanks from PBM... looks dope and fuctional..

03-16-2011, 06:18 AM	#9
S-Nation S13 Post Whore! Join Date: Jan 2008 Location: LAND of the LOST Posts: 4,082 Trader Rating: (92) Feedback Score: 92 reviews	park on hill, remove rad cap, start car, heater on blast, remove bleeder screw, and watch the bubbles come out from the bleeder screw, shake car, once you see coolant leak out and no bubbles.... close bleeder, turn off car, refill rad, and close rad. this is how ive been doing it. every now and then ill bleed it over again.

03-16-2011, 09:50 AM	#11
S-Nation S13 Post Whore! Join Date: Jan 2008 Location: LAND of the LOST Posts: 4,082 Trader Rating: (92) Feedback Score: 92 reviews	what was the problem?

03-16-2011, 03:02 PM	#13
Spring Break '92 Zilvia Member Join Date: Dec 2007 Location: unconcious on Daytona Beach Posts: 180 Trader Rating: (1) Feedback Score: 1 reviews	Looks like the system just needed to burp thats all. Definitely going to install a swirl tank when I replace my hoses soon. __________________ BOOYAH!

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