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I broke it and I don't know what it is!!!


Pennyman

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Yep, looks like the thermotime switch. It'll still start and run okay while the weather is warm, but it'll be a little harder to start and warm up, as the weather gets colder.

Not an emergency, but should be replaced to keep the system operating properly.

Spdloader

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That would be the "Water Temperture Switch" that is messed up. P/N: 22120-N4202 Runs about $53.03 from your local Nissan dealer. Red wire turns into the blue wire at the bullet connector just prior to the wiring for the switch, and the other black wire coming back out of the switch is the ground connection. The thermotime switch is the one behind it with the brown connector still attached to it...

webdawg1

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Hmm, separating the men from the boys now it seems, hehe. I'm gonna head down to the junkyard tomorrow and take one out of another Z. Maybe the ones from the 280zx's work too, hehe. Do you think the sensor off a N47 head would work as well? I don't think there are any N42 heads left at the junkyard...

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Looks like that is something that is on the 75-76 cars. 77-78 doesn't have it so I doubt that you would find it on a ZX. What is it's function? On my 78, the water neck only has the temp sensor, the thermotime switch, and the thermal transmitter (for the temp gauge). The hole where you have the broken item is plugged on a 77-78.

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Yep, looks like the thermotime switch. It'll still start and run okay while the weather is warm, but it'll be a little harder to start and warm up, as the weather gets colder.

Not an emergency, but should be replaced to keep the system operating properly.

Spdloader

Huh? This looks like the electrical wire that runs to the sensor. It doesn't modify engine performance as far as I know. It simply sends a signal back to the guage in the cockpit. Unless I'm not aware of a something... Any more info on this?

The car should run just fine without this sensor, but, you will notice that your guage is not working.

-- MIke

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I think it has to do with the emmision control system actually, the wire I broke eventually makes its way to the EGR solenoid, so I think my car will be running kinda rich actually... I just hope I can find one. The trick is getting a 21mm wrench in there to take it out, hehe. My car is one of the CA models with every sensor known to man on it to make it run cleaner. Any tips on getting it out? I guess I have to use a box end wrench huh?

P.S. I think that picture is worth...at least 2 thousand words, hehe...sorry for the kick in the butt 56K folks!

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Alright, I ordered a new one from Nissan. The guys there are crooks seriously. After tax it came out to be $97.54. Holy crap. I'm poor now. I just don't even understand why my Z needs it and a bunch of others don't. Aperantly it's the sensor that tells the EGR solenoid valve to open a passage to complete a vacuum through the EGR valve itself when the car is at normal operating temp. So until the part comes in, I'll be polluting a little more.

Poor design on Nissan's part to put fragile little wires sticking out of a sensor that is exposed to constant heat, without using a larger gauge wire to help maintian conductivity over time.

Anyone else have something to say? Wanna commiserate? How did later Z's get by without this sensor? I'm confused.

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Poor design on Nissan's part to put fragile little wires sticking out of a sensor that is exposed to constant heat, without using a larger gauge wire to help maintian conductivity over time.

hehe... I have to chuckle at this comment. Datsun/Nissan did an extremely poor job with their electrical work, IMHO. The whole car is like this. You should see the roadster. :)

Broken connectors, broken wires, rusty connections, boots falling apart, incorrect guage, etc... It's all a part of owning a Z. :rambo:

I do have to admit it's not as bad as an MG or a Triumph. hehe...

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I do have to admit it's not as bad as an MG or a Triumph. hehe...

I can only imagine. I think another bad design was putting the main interior wire harness running right beneath the area where the heater hoses and/or the heater core would leak (passenger side floor next to tranny tunnel and firewall). I'ts a wiring nightmare down there, hehe.

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Well, put in the new switch and it runs ALMOST $100 better, hehe. Very smooth, and I can tell the emmisions system is working now because the car idles higher when cold with the new part installed. Yay. Not hard to put in either. Just gotta make sure you don't tighten it too far or you'll really mess stuff up. TAKES A 21mm BOX END WRENCH.

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  • 2 years later...
I found a "Reference" picture that shows the locations for the various sensors screwed into the housing.

webdawg1

I was looking at the attachement and had a few questions. I have a 1975 280z and I broke the temp guage bolt. .. also the wire for the water temp switch was never there although the bolt is there. I also broke the Thermotime switch plug as well..

My question is,

1. what are the part numbers for the water temp switch, water temp sensor ("Water Temp), Thermotime, and the Temp Guage?

2. where does the wire to the "water temp switch" connect to?

Any feedback would be greatly appreciated. Thanks

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