S14 Heat Not Working - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

*chibo* · 12-19-2008, 04:16 PM

Alright - bone stock KA, nothing molested.

Looks like it has a new waterpump, new hoses, etc. Everything is hooked up correctly. When I turn on the heat I just get ambient air blowing at me. Probably related is that there is some temperature gauge fluctuation - when I'm engine braking the water temp dips a little, same with WOT up in the rpms.

Am I looking at a dead thermostat? Any other ideas? Thanks.

orion::S14 · 12-19-2008, 04:45 PM

What year?

If it's a '95, it has a cable operated valve on the heater hoses. Look behind the intake manifold...make sure it moves when you slide the temp control to HOT.

If it's '96-98...then you have some other problem.

The temp fluctuation is probably a loose connection at the sender...it's just a spade clip...and that gauge is pretty inaccurate.

- Brian

***S14DB*** · 12-19-2008, 05:33 PM

On the OBDII S14's the valve usually fails open. It should be open, then when you start the car the valve closes. This is to keep the core purged.

Usually what fails is the mixture damper. Slide from hot to cold fast and listen to hear it travel.

*chibo* · 12-19-2008, 10:35 PM

Ding ding. Thank you guys. I had someone slide it back and forth while I watched/listened and didn't see anything move. It is a 96.

reinvent · 12-19-2008, 10:48 PM

dumb question on the s13 , what does the hot cold switch on interior heater do to change between hot and ambient? i assume hot water always flows through heater core and the switch changed the ducting?

12-19-2008, 04:16 PM	#1
chibo I'm back. :sadface: Join Date: Sep 2005 Location: Tempe and Scottsdale, Arizona Age: 22 Posts: 1,372 Trader Rating: (0)	S14 Heat Not Working Alright - bone stock KA, nothing molested. Looks like it has a new waterpump, new hoses, etc. Everything is hooked up correctly. When I turn on the heat I just get ambient air blowing at me. Probably related is that there is some temperature gauge fluctuation - when I'm engine braking the water temp dips a little, same with WOT up in the rpms. Am I looking at a dead thermostat? Any other ideas? Thanks. __________________

12-19-2008, 04:45 PM	#2
orion::S14 Zilvia FREAK! Join Date: May 2003 Location: Orange Park, FL Posts: 1,511 Trader Rating: (0)	What year? If it's a '95, it has a cable operated valve on the heater hoses. Look behind the intake manifold...make sure it moves when you slide the temp control to HOT. If it's '96-98...then you have some other problem. The temp fluctuation is probably a loose connection at the sender...it's just a spade clip...and that gauge is pretty inaccurate. - Brian __________________ www.KA24DEvelopment.com

12-19-2008, 05:33 PM	#3
*S14DB* AFC #1 Join Date: Oct 2003 Location: 昨晩あなたのお母さんの家 Posts: 14,323 Trader Rating: (1)	On the OBDII S14's the valve usually fails open. It should be open, then when you start the car the valve closes. This is to keep the core purged. Usually what fails is the mixture damper. Slide from hot to cold fast and listen to hear it travel. __________________ Comments should be taken as Opinions not as Statements of Fact.

12-19-2008, 10:35 PM	#4
chibo I'm back. :sadface: Join Date: Sep 2005 Location: Tempe and Scottsdale, Arizona Age: 22 Posts: 1,372 Trader Rating: (0)	Ding ding. Thank you guys. I had someone slide it back and forth while I watched/listened and didn't see anything move. It is a 96. __________________

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

12-19-2008, 10:48 PM	#5
reinvent BANNED Join Date: Dec 2008 Location: illinois Posts: 104 Trader Rating: (0)	dumb question on the s13 , what does the hot cold switch on interior heater do to change between hot and ambient? i assume hot water always flows through heater core and the switch changed the ducting?

Sponsored Links