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

Enders.S13 · 05-31-2012, 03:53 PM

I had a thermostat that was stuck closed and I replaced it with a brand new one. So I filled up the radiator and took it out for a drive and almost right away it got way too hot. I shut the car off and touched the top radiator hose and it was hotter than hell and the thermostat hose was ice cold. But when I squeezed it the hose was stiff and it wasn't circulating water into the block. Basically it's acting like the thermostat is stuck closed again. I have no idea what the hell the issue is because I replaced the water pump and I have a brand new Isis radiator installed. The thermostat is rated to open at 170 degrees. Also I noticed when I took off the housing the previous owner had doubled up on housing gaskets which I thought was odd. Any help would be awesome. The motor is a KA24DE by the way.

Sileighty_85 · 05-31-2012, 04:03 PM

You have Air Bubbles in the system and need to bleed the air out.

I would highly recommend using a Nissan OEM thermo, and not a Autozone one if you didnt.

s13silvia123 · 05-31-2012, 04:06 PM

youtube it on how to bleed your radiator

silver350z05rb · 05-31-2012, 04:06 PM

Check the search button,theres threads that explain KAs need proper bleeding,sometimes they dont,sometimes they do,i had to on mine when I replaced the thermostat,didnt bleed the system and overheated,bled the system,never overheated since then..... its weird,but true,something about iron blocks

Enders.S13 · 05-31-2012, 04:09 PM

Yeah I bought autozone crap just to stay on the cheap side. But I might look into an OEM one. I looked for the bleeder bolt and it looks like the bolt snapped off in the threads. Like it's just missing the top of the bolt :/.

silver350z05rb · 05-31-2012, 04:12 PM

Autozone will work fine ,but for 3to 5 bucks more,you can get OEM,that sucks about the bleeder screw,you can maybe bleed it by unscrewing the temp gauge sensor(1 wire) and use that as a bleeder,as it should be the next highest point that could be unscrewed

Enders.S13 · 05-31-2012, 04:22 PM

Well if that doesn't work, how would I get the busted bolt out of there?

JKL1031 · 05-31-2012, 04:27 PM

run the car with the nose jacked up or on a hill up, with the rad cap off, HVAC on outside circulation, heat on full blast, until the bottom hose gets hot. step inside and check the guage every now and then.

Enders.S13 · 05-31-2012, 04:47 PM

Quote:

Originally Posted by JKL1031

run the car with the nose jacked up or on a hill up, with the rad cap off, HVAC on outside circulation, heat on full blast, until the bottom hose gets hot. step inside and check the guage every now and then.

It sucks cuz there is no heater or A/C in my car. The whole thing was taken out

. But if I still run it nose up would that still work?

slydin240sx · 05-31-2012, 04:54 PM

Quote:

Originally Posted by Enders.S13

But if I still run it nose up would that still work?

Yes!!

If you don't have any heat then most likely the hoses aren't connected on the firewall and just rerouted back onto the engine.

Unless your heater core is messed up causing no heat?

Edwin562 · 05-31-2012, 05:03 PM

another easy way to take out air bubbles are the coolant swirl breather tanks. I used one on my coupe and worked great.. also dont forget T-stat have lil hole on top of it, that should be at 12oclock. just a FYI

Enders.S13 · 05-31-2012, 05:03 PM

Quote:

Originally Posted by slydin240sx

Yes!!

If you don't have any heat then most likely the hoses aren't connected on the firewall and just rerouted back onto the engine.

Unless your heater core is messed up causing no heat?

Yeah I don't have the hoses connected to the motor. The guy who had it before me just kinda threw a motor in there and sold it to me. So basically I'm fixing the problems he didn't want to deal with. But hey a running 240 for $1400 isn't bad. It's a project.

ariansworld · 06-01-2012, 12:56 AM

I have a brand new 95 oem Nissan thermo. I just used it for a sec but never ran it. I paid 32 from the Nissan dealership, Ill take 15 shipped. Lmk

Mishkin_707 · 06-02-2012, 02:31 PM

Get one of those cooling system funnel kits, with the different fitting to put on the neck of the radiator filler, it's like $20 but worth it, I changed my lower radiator hose so had to refill the cooling system, all I did was put my car on the slant of my driveway and put the funnel kit on the radiator filler neck, took me 25 minutes to bleed the system, I didn't even have to use the bleeder valve, I've used the kit for a long time and no overheating issues at all

Enders.S13 · 06-03-2012, 12:18 AM

Quote:

Originally Posted by Mishkin_707

Get one of those cooling system funnel kits, with the different fitting to put on the neck of the radiator filler, it's like $20 but worth it, I changed my lower radiator hose so had to refill the cooling system, all I did was put my car on the slant of my driveway and put the funnel kit on the radiator filler neck, took me 25 minutes to bleed the system, I didn't even have to use the bleeder valve, I've used the kit for a long time and no overheating issues at all

So if I get that kit and raise the nose I just raise it and start the car? Because none of my heater lines are hooked up.

MrSanchez925 · 06-03-2012, 09:04 PM

Did you remove the heater core completely and just look the hoses?

Autozone thermostats and water pumps have a HIGH failure rate.

Save up the money and go oem.

05-31-2012, 03:53 PM	#1
Enders.S13 Join Date: Feb 2012 Location: Phoenix, AZ Age: 27 Posts: 40 Trader Rating: (0) Feedback Score: 0 reviews	Thermostat issue. I had a thermostat that was stuck closed and I replaced it with a brand new one. So I filled up the radiator and took it out for a drive and almost right away it got way too hot. I shut the car off and touched the top radiator hose and it was hotter than hell and the thermostat hose was ice cold. But when I squeezed it the hose was stiff and it wasn't circulating water into the block. Basically it's acting like the thermostat is stuck closed again. I have no idea what the hell the issue is because I replaced the water pump and I have a brand new Isis radiator installed. The thermostat is rated to open at 170 degrees. Also I noticed when I took off the housing the previous owner had doubled up on housing gaskets which I thought was odd. Any help would be awesome. The motor is a KA24DE by the way.

05-31-2012, 04:03 PM	#2
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	You have Air Bubbles in the system and need to bleed the air out. I would highly recommend using a Nissan OEM thermo, and not a Autozone one if you didnt. __________________ 後輪駆動車１番 1989 Built SR GT2871R -363whp 1998 S14 W/RB25- 250ish (For Now) 1986 SR86 - 200ish 1990 R32 GTR - 320hp Don't Buy Engines from JDM-Online http://zilvia.net/f/businesses/207457-jdm-online.html Don't Buy XS-Power or SSAC Shit

05-31-2012, 04:06 PM	#3
s13silvia123 Post Whore! Join Date: May 2006 Location: where waldo is Age: 39 Posts: 3,256 Trader Rating: (16) Feedback Score: 16 reviews	youtube it on how to bleed your radiator __________________ 18g and 20g turbo users click on me http://zilvia.net/f/tech-talk/261219-18g-20g-turbo-users.html

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05-31-2012, 04:06 PM	#4
silver350z05rb Zilvia Junkie Join Date: Apr 2008 Location: California Age: 34 Posts: 432 Trader Rating: (9) Feedback Score: 9 reviews	Check the search button,theres threads that explain KAs need proper bleeding,sometimes they dont,sometimes they do,i had to on mine when I replaced the thermostat,didnt bleed the system and overheated,bled the system,never overheated since then..... its weird,but true,something about iron blocks

05-31-2012, 04:09 PM	#5
Enders.S13 Join Date: Feb 2012 Location: Phoenix, AZ Age: 27 Posts: 40 Trader Rating: (0) Feedback Score: 0 reviews	Yeah I bought autozone crap just to stay on the cheap side. But I might look into an OEM one. I looked for the bleeder bolt and it looks like the bolt snapped off in the threads. Like it's just missing the top of the bolt :/.

05-31-2012, 04:12 PM	#6
silver350z05rb Zilvia Junkie Join Date: Apr 2008 Location: California Age: 34 Posts: 432 Trader Rating: (9) Feedback Score: 9 reviews	Autozone will work fine ,but for 3to 5 bucks more,you can get OEM,that sucks about the bleeder screw,you can maybe bleed it by unscrewing the temp gauge sensor(1 wire) and use that as a bleeder,as it should be the next highest point that could be unscrewed

05-31-2012, 04:22 PM	#7
Enders.S13 Join Date: Feb 2012 Location: Phoenix, AZ Age: 27 Posts: 40 Trader Rating: (0) Feedback Score: 0 reviews	Well if that doesn't work, how would I get the busted bolt out of there?

05-31-2012, 04:27 PM	#8
JKL1031 Zilvia Junkie Join Date: Nov 2010 Location: MS Posts: 427 Trader Rating: (1) Feedback Score: 1 reviews	run the car with the nose jacked up or on a hill up, with the rad cap off, HVAC on outside circulation, heat on full blast, until the bottom hose gets hot. step inside and check the guage every now and then.

05-31-2012, 05:03 PM	#11
Edwin562 Post Whore! Join Date: Nov 2009 Location: Whittier (562) Age: 31 Posts: 4,721 Trader Rating: (35) Feedback Score: 35 reviews	another easy way to take out air bubbles are the coolant swirl breather tanks. I used one on my coupe and worked great.. also dont forget T-stat have lil hole on top of it, that should be at 12oclock. just a FYI

06-01-2012, 12:56 AM	#13
ariansworld Zilvia FREAK! Join Date: Dec 2008 Location: CoRoNa, CA 92882 Age: 31 Posts: 1,361 Trader Rating: (54) Feedback Score: 54 reviews	I have a brand new 95 oem Nissan thermo. I just used it for a sec but never ran it. I paid 32 from the Nissan dealership, Ill take 15 shipped. Lmk

06-02-2012, 02:31 PM	#14
Mishkin_707 Zilvia Addict Join Date: Jul 2009 Location: everywhere Age: 39 Posts: 729 Trader Rating: (1) Feedback Score: 1 reviews	Get one of those cooling system funnel kits, with the different fitting to put on the neck of the radiator filler, it's like $20 but worth it, I changed my lower radiator hose so had to refill the cooling system, all I did was put my car on the slant of my driveway and put the funnel kit on the radiator filler neck, took me 25 minutes to bleed the system, I didn't even have to use the bleeder valve, I've used the kit for a long time and no overheating issues at all

06-03-2012, 09:04 PM	#16
MrSanchez925 Zilvia Junkie Join Date: Feb 2012 Location: Martinez, Ca Age: 32 Posts: 412 Trader Rating: (4) Feedback Score: 4 reviews	Did you remove the heater core completely and just look the hoses? Autozone thermostats and water pumps have a HIGH failure rate. Save up the money and go oem.