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Yet another temp gauge sensor question by Dotrenrew
Started on: 08-06-2013 02:14 PM
Replies: 8 (186 views)
Last post by: Gall757 on 08-07-2013 11:15 AM
Dotrenrew
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Report this Post08-06-2013 02:14 PM Click Here to See the Profile for DotrenrewClick Here to visit Dotrenrew's HomePageClick Here to Email DotrenrewSend a Private Message to DotrenrewEdit/Delete MessageReply w/QuoteDirect Link to This Post
I have an 84 2M4. Temp gauge stays on 100°F all the time. The only time the needle moves is when I start the car. It pegs as I start it and returns to 100.

All of the threads that say how to test it say there are two wires. One green and one green w/white stripe. Mine has one green and one orange.

I grounded out both wires. The green one pegged the needle when grounded and the orange did nothing. Not even the warning light.

Can someone please be kind and tell me what I am missing.


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Gall757
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Report this Post08-06-2013 05:05 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
Perhaps you missed this in your search.....note the special instructions for 84s at the end of the article.

http://www.fierosails.com/tempgage.html

[This message has been edited by Gall757 (edited 08-06-2013).]

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Dotrenrew
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Report this Post08-06-2013 05:28 PM Click Here to See the Profile for DotrenrewClick Here to visit Dotrenrew's HomePageClick Here to Email DotrenrewSend a Private Message to DotrenrewEdit/Delete MessageReply w/QuoteDirect Link to This Post
Thanks Gall. I didn't go all the way down. Too many words.

Anyway, I put a new sensor in and it works.

Now my question is, what is the preferred operating temp? I was hovering around 225°-235° traveling at 55 mph on country roads. Outside temp is around 70°

It seemed a bit high to me.
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Gall757
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Report this Post08-07-2013 09:38 AM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
That's the high end of normal based on how the Pontiac engineers set up the sensors. The fan is supposed to come on at 235*, but the thermostat is supposed to be 195*. So normal operation is 200 to 230.
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Dotrenrew
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Report this Post08-07-2013 09:55 AM Click Here to See the Profile for DotrenrewClick Here to visit Dotrenrew's HomePageClick Here to Email DotrenrewSend a Private Message to DotrenrewEdit/Delete MessageReply w/QuoteDirect Link to This Post
Then I have a problem.

My fan only comes on when the A/C is on.

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Gall757
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Report this Post08-07-2013 09:58 AM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
The 84 has a 2 stage fan switch. I am not sure of the temps for each stage, but it is different than later Fieros. Sounds like yours is not working.

Lots of info here:

http://www.fiero.nl/forum/A...110502-2-102588.html

[This message has been edited by Gall757 (edited 08-07-2013).]

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olejoedad
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Report this Post08-07-2013 10:01 AM Click Here to See the Profile for olejoedadClick Here to Email olejoedadSend a Private Message to olejoedadEdit/Delete MessageReply w/QuoteDirect Link to This Post
Your problem may be only an inaccurate gage.

Check the temp that the ECM is seeing by using a scan tool to view ECM data.
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Dotrenrew
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Report this Post08-07-2013 10:04 AM Click Here to See the Profile for DotrenrewClick Here to visit Dotrenrew's HomePageClick Here to Email DotrenrewSend a Private Message to DotrenrewEdit/Delete MessageReply w/QuoteDirect Link to This Post
Does the fan run off info from the gauge or the actual temp from ECM?

And what scan tool do I use? I am still fairly new to the Fiero world and still don't have a lot of items I need.

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Gall757
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Report this Post08-07-2013 11:15 AM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
It has it's own switch.

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