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97 Trans Am cooling fan problem


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13 replies to this topic

#1 hazeleyes0220

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Posted 02 June 2009 - 03:30 PM

Hello everyone. I have a 97 TA, the fans will not come on unless the AC or heat is on. It is making the car run hotter than it normally does, at times going between the half way mark-210 and the next line before in the red. I have checked the fuses and the relays and that didnt change anything, also changed the tstat...still no luck. Anyone else had this problem? Also curious, the manual says there are 3 fans on the car, which ones would be working that come on with the heat and AC?

#2 rusnrno

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Posted 02 June 2009 - 04:35 PM

You only have two fans on your car. One is the high speed fan and the other is low speed.
The low speed fan isn't programmed to come on until somewhere around 220 degrees.
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#3 Sexy_ws6

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Posted 02 June 2009 - 06:38 PM

:ditto: Which means it gets really hot under the hood when it's at normal operating temp.
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#4 jas

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Posted 02 June 2009 - 07:25 PM

Off topic but once again both Evan & Russ caught my eye with the white birds. I almost bought a white 99 but went for the black 01. Nice cars guys. sharp/clean looking.
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#5 Sexy_ws6

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Posted 02 June 2009 - 07:37 PM

Thanks. Russ has more done to his and mine is still bone stock. :ditto: lol ( i hope we could help some Amy)
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#6 jas

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Posted 02 June 2009 - 08:18 PM

I love bone stock my Camaro is other than shifter and exhaust. Cant say the same for my TA.
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#7 hazeleyes0220

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Posted 03 June 2009 - 06:37 AM

Maybe I didnt word it right....the temp will go over 220...closer to the last white line before in the red and the fan still wont come on, so closer to the 235 mark. Another question...on the fuse box there are 3 relays for fans, think it was spot D F H. Thats where I came up with the 3 fans. So, any ideas what it could be?

#8 wisdom

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Posted 03 June 2009 - 08:38 AM

Bad sensor. I could tell a long tale of woe, but suffice it to say that the car has a number of sensors and if one that triggers a fan fails, you could experience thousands of dollars in damage.

#9 hazeleyes0220

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Posted 03 June 2009 - 11:23 AM

I just changed the temp sensor and it is still doing the same thing. The secondary fan kicks in at about 235 and cools it down to around 215. But shouldnt the primary fan kick in before that?

#10 Chynna_Doll

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Posted 03 June 2009 - 01:35 PM

I have the same problem! But mine only gets super hot when it idels. My fan comes on when it want to come on, it'll let it right about to 260 and I have to either turn on the ac or shut the car off. if I leave the ac on to long and then shit it off,when I need to use it again the fan WONT come back on. Ugh! Cars been like this for a while though, thinkin I need a new fan or something?

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#11 wisdom

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Posted 03 June 2009 - 02:30 PM

This reply might show that I don't personally touch anything under the hood, but have you tried physically switching the fans?

#12 msak

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Posted 03 June 2009 - 02:34 PM

This sounds like the same problem that I have had with my 95 Trans Am. It would only over heat when idling, the fan wouldn't kick on until it was nearly in the red zone on the temp and that is bad. I was tinkering around under the hood and unplugged a sensor that ran to the Air intake between the throttle body and the box, it was rear facing, and had a blue plastic housing (I was removing the air box and had to unplug it). When I unplugged the sensor the fans kicked on when they are supposed to and I haven't had it over heat since.

It's bad that I've left it unplugged, but I don't have the time or money to get it looked it, but maybe you should try that as a quick/temporary fix.


Edited for: stupid spelling...

Edited by msak, 03 June 2009 - 02:35 PM.


#13 FBN Firebird Nation

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Posted 03 June 2009 - 03:36 PM

Have you tried to supply power directly to the fan to see if it will kick on? I know I have posted the troubleshooting chart for this issue, so you might want to check the tech article index to see if I listed it. If not, let me know and I will find it.

#14 julidavillan

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Posted 22 April 2014 - 09:20 AM

I have the same problem with my 97 formula. A few differences. My fan does NOT kick on when I turn on the AC. they both turn on when I use a jumper at each relay respectively (low speed and high speed). So what I'm thinking is the fans work, there is power at the relay but the relay is not getting triggered. I figure bad temp sensor and I bought one. Have not put it in yet but I will do it this afternoon after work. I also am thinking that they should kick on with the AC regardless of the temp sensor working or not right? I also have 3 fan relays. Could the 3rd be the one that kicks them on with the AC?




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