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| Lt1 Fiero Owners. (Page 14/16) |
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cyrus88
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MAY 02, 12:21 AM
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| quote | Originally posted by str8maxn:
Ahhhh ... the radiator has an after market radiator cap . . .
ThermoCap
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Take the cap off and pull on the center poppet. If it's spring-loaded and pulls back, it's non-vented, otherwise it's vented. Fieros require non-vented.
The Camaros and Firebirds with LT-1 didn't have caps on the radiator, they just had them on the overflow/expansion tank, and they were 18-PSI.
I use a small expansion tank in the engine bay (makes it easier to fill and remove air out of the system) with 22-PSI cap, and an 18-PSI cap on the radiator so that I can use the stock Fiero overflow tank.[This message has been edited by cyrus88 (edited 05-02-2022).]
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Will
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MAY 03, 11:38 AM
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| quote | Originally posted by str8maxn:
What do you think these sensor are?
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Looks like he put a T into the CTS port on the cylinder head, then screwed the ECM CTS into one branch and the Fiero gauge sender (or switch?) into the other branch. That will hurt response and accuracy on both because they're not getting coolant flowing over the sensor.
Use this sensor instead: https://www.rockauto.com/en...hp?pk=87392&jsn=1648
GM PN is 10096181. This sensor has three wires and fulfills both functions.
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str8maxn
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MAY 03, 11:46 AM
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Thank you Will ... would you happen to know what pig tail \ connector I need?
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Will
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MAY 03, 12:15 PM
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str8maxn
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MAY 03, 02:04 PM
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I take it I combine the grounds to the connector from both existing connectors? [This message has been edited by str8maxn (edited 05-03-2022).]
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Will
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MAY 03, 03:00 PM
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I just realized the far one has two wires. That means it's either the fan switch or the temp light switch.
The three terminal sensor I linked should go into the waterpump. Two wires go to the ECM, the third goes to the gauge input. FieroGuru posted the pinout, or you can find it online.
You should not need a fan switch, as the ECM should be operating the fan (verify that wire is hooked up to C500-D1)
Your temperature light switch (don't remember if single or two wire) should go into the cylinder head where the brass T in your photo is currently installed.
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str8maxn
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MAY 03, 03:39 PM
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| quote | Originally posted by Will:
I just realized the far one has two wires. That means it's either the fan switch or the temp light switch.
The three terminal sensor I linked should go into the waterpump. Two wires go to the ECM, the third goes to the gauge input. FieroGuru posted the pinout, or you can find it online.
You should not need a fan switch, as the ECM should be operating the fan (verify that wire is hooked up to C500-D1)
Your temperature light switch (don't remember if single or two wire) should go into the cylinder head where the brass T in your photo is currently installed. |
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I believe both connectors uses two wires.
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str8maxn
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MAY 05, 12:15 AM
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I was able to trace one of the two connectors today.
Its the connector that I fixed because it got to close to the exhaust and melted. One end is grounded to the engine block the other wire appears to travel into the cab.
I will work on tracing the other plug.
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Will
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MAY 05, 10:59 AM
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| quote | Originally posted by str8maxn:
I believe both connectors uses two wires. |
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The foreground sensor is the normal 2 wire CTS, so it should have two wires.
The Fiero manual says the stock gauge sender and are in the same unit. Both circuits go to the C500 connector and ground through the housing.
If that device is wired correctly, then it's a different kind of switch, which needs an external ground.
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str8maxn
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MAY 05, 11:03 AM
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| quote | Originally posted by Will:
The foreground sensor is the normal 2 wire CTS, so it should have two wires.
The Fiero manual says the stock gauge sender and are in the same unit. Both circuits go to the C500 connector and ground through the housing.
If that device is wired correctly, then it's a different kind of switch, which needs an external ground. |
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I am hoping to install the new champion radiator this weekend. If I still get higher temp reading ... I'll have to dig deeper into these plugs\sensors.
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