No Heat!!! - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

s14unimog · 10-24-2007, 12:12 PM

So I've had my SR in my s14 for about a year now and it seems that my heat has stopped working. I parked the car on a hill and bleed the cooling system. I disconnected the return from the heater core and watched water come out, so I know there isn't a clog or stuck valve. As far as the heater hose routing goes, I have the lower firewall connection point going to the intake manifold and the upper going to the turbo. My car is an OBDII chassis and doesn't have the valve on the heater line in the engine bay that my buddies '95 has.

So to be absolutely clear, no matter where I slide the temperature setting it only blows cold (outside air basically).

Thoughts?

EATthis · 10-24-2007, 01:55 PM

Blend door prob stuck or fubared.

s14unimog · 10-24-2007, 01:58 PM

is there a way to tell if its working, like a motor I can watch turn a valve or something?

D1GP · 10-24-2007, 01:59 PM

Try replacing the thermostat and make sure that your coolant overflow tank is not cracked.

s14unimog · 10-24-2007, 02:08 PM

Quote:

Originally Posted by D1GP

Try replacing the thermostat and make sure that your coolant overflow tank is not cracked.

As in the mechanical thermostat for the motor? I fail to see how that has anything to do with it? The car will run fine and not over heat. Besides its working, I've felt the lower line on the radiator.

Also the coolent overflow is not cracked and IS holding "MAX" coolent/water

any other idea's?

D1GP · 10-24-2007, 02:13 PM

Quote:

Originally Posted by s14unimog

As in the mechanical thermostat for the motor? I fail to see how that has anything to do with it? The car will run fine and not over heat. Besides its working, I've felt the lower line on the radiator.

Also the coolent overflow is not cracked and IS holding "MAX" coolent/water

any other idea's?

a thermostat that is stuck open will not allow your coolant to get to adequate operating temps which will in turn keep your temps cool and your heater cold.

MavericStephenc · 10-24-2007, 02:19 PM

try the thermo, also the heater core might be junk. that happened to me when i had a bravada back in the day, the heat randomly stopped working one day and i didn't know what happened, low and behold it was the heater core

s14unimog · 10-24-2007, 02:29 PM

I guess there is no harm in looking at it but I'm pretty sure the thermo is ok. The car will warm up fine and settle at operating temperature. Also the lower Radiator line will stay cold until the temp levels out in my cluster. When you say the heater core might be junk....what do you mean? Its not leaking and I can run water thru it without a problem.

MavericStephenc · 10-24-2007, 02:37 PM

I don't know how it goes bad, I do know that when i replaced my the heat was fine again.whenI say junk i mean not working to it's full potential.
http://en.wikipedia.org/wiki/Heater_core more info here

projectRDM · 10-24-2007, 02:41 PM

It's more likely the blend door motor. Go under the dash, look straight up by the gas pedal, there's two motors on the side of the heater case. The lower one closest to the firewall is the one you want to check, there's a plastic cover on the bottom, remove it, then turn the key on and slide the temp control back and forth. If it moves freely and fully without binding, you have another problem. If it binds up or doesn't move, replace it.

I have about thirty of them if you need one.

s14unimog · 10-24-2007, 02:59 PM

thats the response I was looking for, Thanks Russ!

we might be in touch

EATthis · 10-24-2007, 11:56 PM

Yeah sorry i never got back to your pretty much what he said....

10-24-2007, 12:12 PM	#1
s14unimog Nissanaholic! Join Date: Dec 2003 Location: In a place, near a river, over a lake Age: 38 Posts: 2,415 Trader Rating: (22) Rides Gallery: s14unimog Feedback Score: 22 reviews	No Heat!!! So I've had my SR in my s14 for about a year now and it seems that my heat has stopped working. I parked the car on a hill and bleed the cooling system. I disconnected the return from the heater core and watched water come out, so I know there isn't a clog or stuck valve. As far as the heater hose routing goes, I have the lower firewall connection point going to the intake manifold and the upper going to the turbo. My car is an OBDII chassis and doesn't have the valve on the heater line in the engine bay that my buddies '95 has. So to be absolutely clear, no matter where I slide the temperature setting it only blows cold (outside air basically). Thoughts? __________________ Fuking ginger bread man stole my wallet... SHIFT*lock_slide to side d3m3rs0n: if i have a baby im naming it Brandons Fault Emerson

10-24-2007, 01:58 PM	#3
s14unimog Nissanaholic! Join Date: Dec 2003 Location: In a place, near a river, over a lake Age: 38 Posts: 2,415 Trader Rating: (22) Rides Gallery: s14unimog Feedback Score: 22 reviews	is there a way to tell if its working, like a motor I can watch turn a valve or something? __________________ Fuking ginger bread man stole my wallet... SHIFT*lock_slide to side d3m3rs0n: if i have a baby im naming it Brandons Fault Emerson

10-24-2007, 02:19 PM	#7
MavericStephenc Zilvia Addict Join Date: Aug 2006 Location: salem mass. Age: 37 Posts: 830 Trader Rating: (0) Feedback Score: 0 reviews	try the thermo, also the heater core might be junk. that happened to me when i had a bravada back in the day, the heat randomly stopped working one day and i didn't know what happened, low and behold it was the heater core __________________ That kind of attitude is SHIT. People with that kind of complacent outlook on law and government are the bane of this country's existence. -Thesquidd Boycott Berkeley and code pink

10-24-2007, 02:29 PM	#8
s14unimog Nissanaholic! Join Date: Dec 2003 Location: In a place, near a river, over a lake Age: 38 Posts: 2,415 Trader Rating: (22) Rides Gallery: s14unimog Feedback Score: 22 reviews	I guess there is no harm in looking at it but I'm pretty sure the thermo is ok. The car will warm up fine and settle at operating temperature. Also the lower Radiator line will stay cold until the temp levels out in my cluster. When you say the heater core might be junk....what do you mean? Its not leaking and I can run water thru it without a problem. __________________ Fuking ginger bread man stole my wallet... SHIFT*lock_slide to side d3m3rs0n: if i have a baby im naming it Brandons Fault Emerson

10-24-2007, 02:37 PM	#9
MavericStephenc Zilvia Addict Join Date: Aug 2006 Location: salem mass. Age: 37 Posts: 830 Trader Rating: (0) Feedback Score: 0 reviews	I don't know how it goes bad, I do know that when i replaced my the heat was fine again.whenI say junk i mean not working to it's full potential. http://en.wikipedia.org/wiki/Heater_core more info here __________________ That kind of attitude is SHIT. People with that kind of complacent outlook on law and government are the bane of this country's existence. -Thesquidd Boycott Berkeley and code pink

10-24-2007, 01:55 PM	#2
EATthis Join Date: Aug 2007 Location: wa Age: 38 Posts: 22 Trader Rating: (0) Feedback Score: 0 reviews	Blend door prob stuck or fubared.

10-24-2007, 01:59 PM	#4
D1GP Zilvia Junkie Join Date: Apr 2004 Location: SLC, UT Posts: 378 Trader Rating: (1) Feedback Score: 1 reviews	Try replacing the thermostat and make sure that your coolant overflow tank is not cracked.

10-24-2007, 02:41 PM	#10
projectRDM Post Whore! Join Date: Dec 2002 Location: Atlanta Age: 51 Posts: 13,812 Trader Rating: (12) Feedback Score: 12 reviews	It's more likely the blend door motor. Go under the dash, look straight up by the gas pedal, there's two motors on the side of the heater case. The lower one closest to the firewall is the one you want to check, there's a plastic cover on the bottom, remove it, then turn the key on and slide the temp control back and forth. If it moves freely and fully without binding, you have another problem. If it binds up or doesn't move, replace it. I have about thirty of them if you need one. __________________ FORMERLY R240NA Learn what's really going on and protect your assets now before they're gone forever: www.paypalsucks.com

10-24-2007, 02:59 PM	#11
s14unimog Nissanaholic! Join Date: Dec 2003 Location: In a place, near a river, over a lake Age: 38 Posts: 2,415 Trader Rating: (22) Rides Gallery: s14unimog Feedback Score: 22 reviews	thats the response I was looking for, Thanks Russ! we might be in touch __________________ Fuking ginger bread man stole my wallet... SHIFT*lock_slide to side d3m3rs0n: if i have a baby im naming it Brandons Fault Emerson

10-24-2007, 11:56 PM	#12
EATthis Join Date: Aug 2007 Location: wa Age: 38 Posts: 22 Trader Rating: (0) Feedback Score: 0 reviews	Yeah sorry i never got back to your pretty much what he said....