83 Datsun 280zx - Temp switch
#1
83 Datsun 280zx - Temp switch
My temperature switch is acting wonky. I have the digital dash version of the 83 Datsun and I notice, that when my car sits for 8 hours, the temperature is half way upon starting the car which is absolutely impossible because that's about 190 degrees Fahrenheit or more.
So as the engine starts and warms up, it apparently uses that 190 degree mark as its '0' or starting point and warms up from there, and it just terrifies me seeing my engine temp max out.
Have others encountered issues with this temp switch on the engine? Is there any way to fix a temp switch without replaceing it? I've been hunting everywhere and the soonest they can deliver one is in a week for $24
So as the engine starts and warms up, it apparently uses that 190 degree mark as its '0' or starting point and warms up from there, and it just terrifies me seeing my engine temp max out.
Have others encountered issues with this temp switch on the engine? Is there any way to fix a temp switch without replaceing it? I've been hunting everywhere and the soonest they can deliver one is in a week for $24
#3
When I unplug this, the unit sends no data to my dash, its just blank. It can't be a temp sensor because if I run my vehicle too hard, the fan that sits on top the engine will kick on, and it always has done that when it gets too warm, it hasn't gotten that warm anymore since I did a complte flush in the cooling system, so temps have been lower.
So when I see my dash skyrocket to what looks like 250+ degrees, my fan never kicks on, nor is my coolant system bursting at the seams.
#4
What's strange is that when I do a search for 'temperature sensor' and 'temperature switch' I get back similar results with two different parts.
Even when I headed to places like Autozone, they had a parts list and they were mixed under teh same name, some were switches, others were sensors when we would search for 'coolant sensor'
I know right where the thermostat resides, there are three electrical components, I guess which one does what? I know for a fact if I unplug the one mentioned on the previous post, the temperature display dissapears.
I guess I'm generally confused now...
Even when I headed to places like Autozone, they had a parts list and they were mixed under teh same name, some were switches, others were sensors when we would search for 'coolant sensor'
I know right where the thermostat resides, there are three electrical components, I guess which one does what? I know for a fact if I unplug the one mentioned on the previous post, the temperature display dissapears.
I guess I'm generally confused now...
Last edited by RETICON; 07-27-2013 at 11:29 PM.
#5
Temperature sending unit is just a sensor who's resistance changes based on temperature that your gauge displays. Temperature switch only has two modes, on and off, that is triggered when a set temp is hit and that usually controls the fan. It's also called a thermotime switch. The trigger temp is usually marked on it. Temperature sensor is usually what the ecu reads, and works just like the temp.sending unit, just varying its resistance based on temp but is used to help monitor fuel enrichment and cold start up. Temp sender usually just has one wire and grounds to housing. The sensor almost always has two wires, and the switch can go either way.
Last edited by GTR; 07-28-2013 at 12:18 AM.
#6
Temperature sending unit is just a sensor who's resistance changes based on temperature that your gauge displays. Temperature switch only has two modes, on and off, that is triggered when a set temp is hit and that usually controls the fan. It's also called a thermotime switch. The trigger temp is usually marked on it. Temperature sensor is usually what the ecu reads, and works just like the temp.sending unit, just varying its resistance based on temp but is used to help monitor fuel enrichment and cold start up. Temp sender usually just has one wire and grounds to housing. The sensor almost always has two wires, and the switch can go either way.
In this pic here, could you tell me which of the upper three electronic components are what? I replaced the bottom of the 3 with a different 'sensor' and it didn't work, it just maxed out my temperature
Thanks guys, I have a big trip today and I want to make sure I find the source of this issue.
#7
Click: https://www.zdriver.com/forums/280zx...sensors-36716/
And click: XenonS130 - S130 Reference
And click: XenonS130 - S130 Reference
There are 3 sensors...
#1: Water temp sensor for dash gauge
#2: Water temp switch for the aux fan
#3: Thermotime switch for the cold start valve (n/a only).
From the FSM (you should download it here: XenonS130 - S130 Reference if you haven't done so yet).
#1: Water temp sensor for dash gauge
#2: Water temp switch for the aux fan
#3: Thermotime switch for the cold start valve (n/a only).
From the FSM (you should download it here: XenonS130 - S130 Reference if you haven't done so yet).
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