Running Hot (235+) - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 06-06-2004, 01:47 PM   #11
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Quote:
Originally Posted by 2000SilverBullet
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Of all my cooling mods, the extra trans cooler probably did the most for everyday driving. The fan override is the quickest way to drop big spikes in temps, though. Of course, the fan override is more effective because of the extra trans cooler, too.
Do you run with the low speed on all the time, or just use it intermittently
How long do you leave the hi speed on for
When I kick the high speed on at idle, I can feel the engine speed drop for a sec due to the high amp load. Low speed is not noticeable.
Do you run with the A/C on all the time, with your much higher outside temps.
On days of 75F (not metric ) or higher, if I'm NOT using my AC, I leave the high speed on all the time. My low speed mode throws a QDMa fault and SES light, so I don't use it. (after the car warms up......say about 5 min). This is becoming habit now. I don't even think about it. I'm tempted to put a 5 min relay in, or run it off an external thermostat set to come on at 180F ECT.

I don't notice the high speed making an engine load difference. The AC does slightly, but the high-speed fans don't. My 160amp DP alternator may be why.
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Old 06-06-2004, 02:33 PM   #12
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Speedin, your fans do run, right? If not, there are two relays and one fuse under the Maxi-fuse cover on the firewall.
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Old 06-06-2004, 03:00 PM   #13
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Both my fans come on. The high speed fan switch, is this just a relay that supplies the fan with a full 12 volts?
Also, i see that there are 160 degree thermo'* also. Is that too cold to run?

So is it normal for the car to run a full 20+ degrees cooler with the AC off?
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Old 06-06-2004, 03:04 PM   #14
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Quote:
Originally Posted by speedin
Both my fans come on. The high speed fan switch, is this just a relay that supplies the fan with a full 12 volts?
Also, i see that there are 160 degree thermo'* also. Is that too cold to run?

So is it normal for the car to run a full 20+ degrees cooler with the AC off?
1. It'* a switch wired to the ground of the relay.

2. Too cold unless you have a PCM chip programmed for it.

3. No, it'* not normal. Mine runs cooler in city traffic with the AC on because the fans are always on.
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Old 06-07-2004, 06:18 PM   #15
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Originally Posted by BonneMeMN
We've found some to run hot on their own, i know truewildman had a bad temp on his for a long time.
Still do...
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Old 06-08-2004, 02:22 AM   #16
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I have had the same problem with my 97. A 180* stat helped for the most part, but I am considering a tranny cooler, or a high speed manual switch. When I just sit there I get hot on the humid days, so I just turn the AC off until I get move'n again.
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Old 06-08-2004, 09:27 PM   #17
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Quote:
I have had the same problem with my 97. A 180* stat helped for the most part, but I am considering a tranny cooler, or a high speed manual switch. When I just sit there I get hot on the humid days, so I just turn the AC off until I get move'n again.
That'* just your Flame paint scheme heating things up.
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Old 06-09-2004, 02:29 AM   #18
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Quote:
Originally Posted by 97bonnevillextreme
I have had the same problem with my 97. A 180* stat helped for the most part, but I am considering a tranny cooler, or a high speed manual switch. When I just sit there I get hot on the humid days, so I just turn the AC off until I get move'n again.
The AC actually helps, it turns on the high speed fan for 2 min bud! Don't turn it off.
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Old 06-10-2004, 12:57 AM   #19
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The AC actually helps, it turns on the high speed fan for 2 min bud! Don't turn it off.
Yes, you're right, it will help to keep the A/C on but the fans come on low speed only. The high speed fans don't kick in until the temp climbs above 210 F. The stock 195 thermostat is fully open at 207 F.

With my DHP computer the high speed fans come on if the temp is higher than 185 F and stay on for 2 minutes after the engine is turned off.

With the higher temps now, I have adopted Will'* habit of leaving the high speed fans on all the time, after the coolant temp has reached about 170 F.
Now the temps never go over 180 F unless I really get into a performance run and even then it never goes over 190 F.
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Old 06-10-2004, 01:45 AM   #20
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i have the stock 195 t-stat and an extra tranny cooler, the tranny cooler made a big difference but I still run about 200-205 on the highway. Rarely will I go over 210 even after performance runs. This is with the AC on almost all the time. its better to have your AC on than the windows down when on the highway. when I am in town I usually put the windows down and turn off the AC, just let it blow air in, that probably helps keep the temps down in the stop and go.
The tranny cooler helped alot to keep me regular.
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