temp sender on 85 12a - RX7Club.com - Mazda RX7 Forum

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temp sender on 85 12a

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Old 01-03-04, 12:28 PM
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Angry temp sender on 85 12a

I need a little help with the location of the temp sender. I know its located on the block somewhere near the oil filler, but I don't see it.
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Old 01-03-04, 01:27 PM
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it should be on the rear casing, below the oil filter, above the heater hose to the left . here i'll post a pic. there should be a yellow wire hooked to it.


pic

Last edited by kettlman; 01-03-04 at 01:34 PM.
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Old 01-03-04, 01:29 PM
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up an the the rear of the oil sender
its just a prong
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Old 01-03-04, 02:23 PM
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picsss

I took a few pics, plus one of the ride since I have'nt yet
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Old 01-03-04, 02:29 PM
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SO can you see from Kettlmans pic where it goes?
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Old 01-03-04, 02:42 PM
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It would'nt be in a different location because its a california car could it? I'm looking at the area in the pic, I'm not seeing it
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Old 01-03-04, 02:46 PM
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What does the sensor do that screws into the back of the water pump housing at the front of the engine?
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Old 01-03-04, 02:50 PM
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Originally posted by mar3
What does the sensor do that screws into the back of the water pump housing at the front of the engine?
That controls the choke. My question is what does the sensor do at the bottom of the radiator?
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Old 01-03-04, 02:55 PM
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Originally posted by texas rx's
It would'nt be in a different location because its a california car could it? I'm looking at the area in the pic, I'm not seeing it
Nope, same spot dude. Its really small though and usually covered in dirt.

And for the hijackers. The one on the rad is for the emissions control computer.
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Old 01-03-04, 03:02 PM
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Originally posted by Rx7carl
And for the hijackers.
haha

BTW, I just added this thread to the FAQ. Now everyone will know all about the all-important temperature sensors.
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Old 01-03-04, 03:56 PM
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I did see a small opening behind the oil sender but the part I have didn't fit. Could it be missing? wouldn't water shoot out if so?
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Old 01-03-04, 04:04 PM
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Yes, that looks like the part BUT..... Quoted from this Mazdatrix page: Sensors, Senders, and Miscellaneous Electrical

"Note: A few years ago MAZDA changed the thread on the water temp sender in the rear side housing from the straight thread that they had used forever, to a metric pipe thread. All NEW rear housings have the new thread. It is essentially impossible to tell which you have with out looking at it. Most cars still use the straight thread. However, if the engine has been replaced with a FACTORY rebuilt, there is a small chance you have the pipe thread. The new sender will not read correctly in pre-80 cars"

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Old 01-03-04, 04:11 PM
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I could have the wrong one, since there were but could it be missing from the car? The hole that is there is a little smaller than the part I have, so I'm not sure about the threads in the housing.
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Old 01-06-04, 09:35 AM
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Well, the temp sender is broke off in the block, I tested the loose yellow wire with a test light and the gauge went up some, so it works. Anyway, anyone have any suggestions for technique, tools, etc. to get this thing out?
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Old 01-06-04, 10:07 AM
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Drill and an easy out.
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Old 01-06-04, 10:18 AM
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Mine broke, too. It's a pain in the *** to get it out, but like Carl said, an easy out will do it, but you're not gonna have a lot of room to work with.
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Old 01-06-04, 10:37 AM
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Thumbs up

Thanks for the help, I'm gonna get it done this week
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Old 01-06-04, 11:09 AM
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i'm glad you got it figures out.
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Old 04-02-04, 05:30 PM
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Originally posted by inittab
That controls the choke. My question is what does the sensor do at the bottom of the radiator?
I thought the choke ran off of the main water temp sensor in the driver side's of the engine. Mine is not connected right now and I though that's why the choke wasn't working
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Old 04-02-04, 05:53 PM
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umm i think he has the sensor behind the water pump housing.... thats called the temp. sensor as well. thats what its called on the advanced auto parts computer. is it about a half inch thick and have two wires sticking out the back?
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Old 04-02-04, 06:19 PM
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when in doubt, spray the area with carb cleaner. might help.
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Old 04-03-04, 07:31 PM
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Ok. Now here's an important question. I don't have a temp sensor in the block right now. Could I wire the temp gauge to the sensor in the back of the water pump housing? i.e. do they have the same resistance for the same temperature?
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Old 12-05-07, 03:26 AM
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i have the same concern... i use the opening in the back of the water pump housing to run my Water Temp Guage... its an aftermarket guage and i just screwed the fitting into the hole.... the person who had this car before me had the same thing setup, but the guage crapped out.... how is this gonna affect my dellorto carb and choke? if i dont have anything plugged into it from the water pump housing???
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Old 12-05-07, 09:27 AM
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My recommendation is to put the correct plug into the water housing and run a new adapter for your temp sender where the stock one is located.

I'm not sure what the thread size is, but check this link just in case.
http://www.pegasusautoracing.com/Pro...asp?RecId=3142
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Old 12-05-07, 12:24 PM
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Upon doing some searching, might not have to worry about the location of the sender. Try this link, see if there are some answers in there that should help you.

https://www.rx7club.com/1st-generation-specific-1979-1985-18/aftermarket-water-temp-gauge-install-adapter-fitting-311349/
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