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Coolant gauge seems to be inop or is it the sensor ?

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Old 06-28-2015, 08:47 PM
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Car: 1984 Trans Am Recaro Edition
Engine: 355 L98 Vortec 226/234 custom cam
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Coolant gauge seems to be inop or is it the sensor ?

Not getting a temp reading on the gauge but the Autoxray shows temperature readings..... My question is for a 1984 Trans Am, does the same sensor send data to the ECM and instrument gauge?


Thanks !
Chuck
Old 06-28-2015, 09:38 PM
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Re: Coolant gauge seems to be inop or is it the sensor ?

2 completely separate sensors.

The gauge one is in the driver's side head between the #1 & #3 spark plugs. Should have a green wire plugged onto it.
Old 06-28-2015, 10:03 PM
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Re: Coolant gauge seems to be inop or is it the sensor ?

Thought it would be 2 sensors..

Cool...I'll check that ... I thought that sensor between 1 and 3 was for the fan?
Old 06-29-2015, 02:23 AM
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Re: Coolant gauge seems to be inop or is it the sensor ?

the sensor between 1 and 3 is the gauge wire... test it by turning the key on and grounding the wire: it should make the gauge instantly max out... if it does make the needle jump, then buy a new sensor and put it in.. they are cheap.. if it doesn't move the needle, trace the wire and figure out what the problem is.
Old 06-29-2015, 07:53 AM
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Car: 1984 Trans Am Recaro Edition
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Axle/Gears: On borrowed time...
Re: Coolant gauge seems to be inop or is it the sensor ?

Originally Posted by novaderrik
the sensor between 1 and 3 is the gauge wire... test it by turning the key on and grounding the wire: it should make the gauge instantly max out... if it does make the needle jump, then buy a new sensor and put it in.. they are cheap.. if it doesn't move the needle, trace the wire and figure out what the problem is.
Thank you!!
Old 06-29-2015, 05:34 PM
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Re: Coolant gauge seems to be inop or is it the sensor ?

Switch for the fan is in the same place in the other head; between #6 & #8 plugs.
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