Temperature sending unit location?

[tinkering]

!993 TransSport 3.8: Where is the TSU located and what size of socket or wrench is neccessary (gauge on dash)?

[LMP]

AH..this one....(the one used by the computer is another one)
...I've NEVER seen it but here is an indirect solution in case you wanted first to verify its operation..if not done yet. This is a very sturdy sensor and very rarely fails. Wiring is more susceptible to failure.

Connector 100 is near left hand hood hinge,
This is a 10 pin connector and contact G - dark green/white stripe - is the one that leads to i/p temp sensor.
Measure G to ground

CONtacts are
ABCDE
x JHGF
resistance values show on this i/p diagram
www.avigex.ca/xport/instrumentpanel1.jpg
and here
www.avigex.ca/xport/thermistor.jpg

[tinkering]

Originally Posted by LMP

AH..this one....(the one used by the computer is another one)
...I've NEVER seen it but here is an indirect solution in case you wanted first to verify its operation..if not done yet. This is a very sturdy sensor and very rarely fails. Wiring is more susceptible to failure.

Connector 100 is near left hand hood hinge,
This is a 10 pin connector and contact G - dark green/white stripe - is the one that leads to i/p temp sensor.
Measure G to ground

CONtacts are
ABCDE
x JHGF
resistance values show on this i/p diagram
www.avigex.ca/xport/instrumentpanel1.jpg
and here
www.avigex.ca/xport/thermistor.jpg

I am going to get around to checking these resistance values at the connector you mention... soon. When I changed the starter I saw a sending unit just above the end of the starter, screwed into the block. Could this be the temp gauge sending unit? The gauge needle moves all the way to right when I turn the key so I suspect wiring or the sending unit. If I ground the sending unit lead it should essentially pin the gauge needle, correct?

[tinkering]

Originally Posted by brycets2

I've taken it to a few dealers that couldn't do it.

Did you ever get it fixed? Lets see if we can come up with a solution, even if it means using an after market dash mount gauge. Who has some ideas?

[tinkering]

Originally Posted by LMP

AH..this one....(the one used by the computer is another one)
...I've NEVER seen it but here is an indirect solution in case you wanted first to verify its operation..if not done yet. This is a very sturdy sensor and very rarely fails. Wiring is more susceptible to failure.

Connector 100 is near left hand hood hinge,
This is a 10 pin connector and contact G - dark green/white stripe - is the one that leads to i/p temp sensor.
Measure G to ground

CONtacts are
ABCDE
x JHGF
resistance values show on this i/p diagram
www.avigex.ca/xport/instrumentpanel1.jpg
and here
www.avigex.ca/xport/thermistor.jpg

I found the connector, the 'G' contact, and the green wire with white tracer. I checked the ohms readings as per the above links. One side of the connector showed 'open' with no reading at all. The other side of the connector showed 49 ohms with the engine cold; it went up to 59 ohms with the engine warm. These values do not jive at all with the data in the above links.

I momentarily grounded the contact in the connector which made the gauge needle jump. I located the temp sending unit (finally! I will desscribe the location below). I unplugged the TSU and temporarily grounded the contact (green wire w/white tracer) in the plug; this causes the gauge needle to jump.

I can now only deduce that it is the TSU itself. $30 CAD +/-

The TSU (or the Coolant Temp Sensor I think it is called) is hidden around the back of the intake manifold; maybe right on the intake manifold back there. It is closer to the drivers side of the manifold. There are some vacuum lines, and some bracket type stuff just above the TSU. I was able to jockey my hand around to barely make it fit in there. It is a tight squeeze but it looks like a socket and extension will fit in there. I will post the results.

[tinkering]

The sensor is definitely hard to see and reach. You can see the connector and the wire but have to feel around for the fitting. A mirror might come in handy for you. I forget the socket size I used and whether it had to be deep or not...sorry.
The old sensor was quite corroded along the top. I changed it out and voila!!