temperature sender malfunction?
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Junior Member
Joined: Mar 2010
Posts: 56
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temperature sender malfunction?
I have an 88 Iroc with dual coolant fans.The temp gauge is in the red and the fans do not come on.If I ground the ALDL with the key on the primary fan comes on.If I unground the ALDL, turn on the key and ground the green-white wire at the primary relay the primary fan turns on.Seems like everything is okay.If I ground the green-white wire at the secondary fan relay with the key on the secondary fan turns on.Seems like everything is okay there too.Could there be any other problem other than the fact the temp sender is shot and the engine is not as hot as the gauge says? Thank-you for any replies.
Supreme Member
Joined: Sep 2002
Posts: 9,192
Likes: 20
From: Cary, North Carolina
Car: 1992 RS
Engine: Carbed 350
Transmission: 700R4
Axle/Gears: 3.42 posi
Re: temperature sender malfunction?
Sounds like you need a Coolant Temperature Sensor (located at the thermostat, black wire & yellow wire), and maybe a fan switch (located pass side head between #6 & #8 spark plug).
The CTS tells ECM the temp, then the ECM turns on primary fan.
The switch turns on secondary fan.
The CTS tells ECM the temp, then the ECM turns on primary fan.
The switch turns on secondary fan.
Member
Joined: May 2004
Posts: 418
Likes: 0
From: Fort Lauderdale
Car: 1991 Pontiac Trans Am
Engine: 305
Transmission: 700r4
Re: temperature sender malfunction?
It's possible that it's not the switch itself. On mine, that plug is right next to the headers and it just fell apart due to age. You may also need to splice in a new plug. Easy enough to do at least.
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