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PostPosted: Wed Oct 03, 2018 3:04 pm 
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Joined: Wed Sep 05, 2018 9:13 am
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Year and Trim: 2003 Bonneville SE
Hello-

I have a 2003 3.8l Bonneville that stays cool because I kive in 90+ degree Florida! If I turn off the air conditioning the fans do not run... no overheating, but temp goes a tick over 200 and holds steady.
I looked around a little bit for some ideas, but do not know how to diagnose.
No overheat condition, but rad fans wont come on without the air conditioning...
Thanks!


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PostPosted: Wed Oct 03, 2018 9:12 pm 
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Posts like an LG3
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Joined: Tue Oct 19, 2010 7:45 am
Posts: 314
Location: New York
Year and Trim: 2004 Bonneville SE
From what you describe there is no problem and the cooling system is functioning normally.

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2004 Bonneville SE 151,xxx- 20% tint all around, 5% tint bar on windshield | 4500k DDM HID low | De-badged | Hardwired Passport 9500ix | FWI(inter-cooler piping) | FE2 Rear Sway Bar | Solid Motor Mount | 180* Stat | Firm Shift Kit

My old car(now brother's car) 1998 Bonneville SE 230,xxx- 20% tint all around
Other cars in family(only the Pontiacs)
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PostPosted: Thu Oct 04, 2018 7:18 pm 
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Location: Macedonia, OH
Year and Trim: 2002 SE
Sounds normal to me as well. I thought I had an issue as well (same diagnosis as you) but nope. Everything is okay.

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PostPosted: Mon Oct 08, 2018 1:35 pm 
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Location: Margate, England.
Year and Trim: 1987 Oldsmobile Delta 88

1989 Buick Le Sabre
Let the car idle in still air and see if the fans come on. They shouldn't until the coolant temperature reaches around 220 degrees, and should shut off when it gets below maybe 180.
If you keep moving the fan will almost never come on, the flow of air through the radiator is enough to keep things cool.

Roger.


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PostPosted: Tue Oct 09, 2018 12:29 am 
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Location: Las Cruces, NM
Year and Trim: 1993 Buick Park Avenue
1994 Buick Regal Custom
If the gauge holds steady a tick above 200 while just sitting there idling, either the fans are coming on, or there is enough air moving through the radiator (a breeze) to keep temps in check.

As mentioned, fans don't come on low until 215 (approx) and hit high if it pushes beyond 225, or if they are required for air conditioning. It's very rare that the fans will ever run at high speed under normal conditions, aside from A/C.

If the fans are on low, it's possible they are running but you simply can't hear them. They should shut off once it cools down around 210 or so.

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