Oldsmobile Coolant temp sensor reads hot

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dhardy724
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Joined: Wed Jan 30, 2013 9:02 am

Oldsmobile Coolant temp sensor reads hot

Unread post by dhardy724 » Wed Jan 30, 2013 9:06 am

My buddy did a engine swap on my 96 olds cutlass supreme and he replaced the coolant temp sensor and not it reads hot on the temp gauge when I start the car can anyone help me it is the 3.1 sfi motor.

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ProTech
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Re: Coolant temp sensor

Unread post by ProTech » Thu Jan 31, 2013 8:27 pm

Possibly put the wrong sensor in, or the terminals are reversed, or just a bad sensor. I'd have to say it's something the guy did during the engine swap if the temp gauge worked normally before that. Possibly some wiring got crushed or broken during the swap. If everything checks out normally, you could just have a bad gauge in the instrument cluster.
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dhardy724
Posts: 3
Joined: Wed Jan 30, 2013 9:02 am

Re: Coolant temp sensor

Unread post by dhardy724 » Fri Feb 01, 2013 8:47 am

Well I had the computer read and it said that there was voltage problem with it now if he changed one of the sensors shouldn't he have changed the one for the gauge as well

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ProTech
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Re: Coolant temp sensor

Unread post by ProTech » Fri Feb 01, 2013 9:29 am

Just because you had a code for a voltage issue, doesn't mean it's automatically a sensor problem. Also, depending on what year/model your used engine came out of, it could have one or two sensors. Some years only have one sensor that works both the gauge and the computer, some have two. You might want to have him go over his work and check it out.
GM Dealer Technician For 18+ Years
In the automotive industry for 20+

dhardy724
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Joined: Wed Jan 30, 2013 9:02 am

Re: Coolant temp sensor

Unread post by dhardy724 » Fri Feb 01, 2013 10:03 am

Alright on that note the motor came out of a 97 grand am

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ProTech
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Re: Oldsmobile Coolant temp sensor reads hot

Unread post by ProTech » Fri Feb 01, 2013 11:44 am

Yeah, you may have a different set up now. The Grand Am is an 'N' body style and your Cutlass is a 'W' body style. Your best bet would be to go to your local GM dealer and have them look up the sensors for each and see if there is two, one, or they are different part numbers. That would be your problem then, and probably no way of getting around it. If you are confident the engine is running fine and not overheating, you could just live without the gauge and save some money.
GM Dealer Technician For 18+ Years
In the automotive industry for 20+

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