98redaurora
Aurora Driver
This is not your fathers Oldsmobile.
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Post by 98redaurora on Sept 3, 2012 21:13:18 GMT -6
That's a VERY good question, lol. Right!? It should be, the low turns on at 205 and high at 220 or 215.
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Post by nelson480 on Sept 4, 2012 0:02:59 GMT -6
The PCM will command fan operation when: Low Speed Fan Operation Engine coolant temperature exceeds approximately 106°C (229°F). Transmission fluid temperature exceeds 150°C (302°F). A/C operation is requested. After the vehicle is shut OFF if the coolant temperature at key-off is more than 151°C (304°F) and system voltage was more than 12 volts. The fans will stay ON for approximately 3 minutes. High Speed Fan Operation Engine coolant temperature reaches 112°C (234°F). Transmission temperature is more than 151°C (304°F). When certain DTCs set. The fans will switch from low to OFF when the coolant drops below 102°C (216°F). The fans will switch from high to low (except DTCs set) when the coolant drops below 106°C (229°F). Check out Bob's Deluxe Cooling Fan Mod in the stickies. Why is it my fans will run Low, and sometimes HI with the A/C on?
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Post by sall on Sept 4, 2012 5:55:57 GMT -6
How do you know they are running on high speed?
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Post by nelson480 on Sept 4, 2012 12:57:42 GMT -6
Because they can't barely be heard on low. And you can hear them alot more on Hi
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98redaurora
Aurora Driver
This is not your fathers Oldsmobile.
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Post by 98redaurora on Sept 5, 2012 16:45:04 GMT -6
Car runs good now 195-205 at all times. Changed to greeen coolant, and new thermostat.
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Post by sall on Sept 5, 2012 17:59:09 GMT -6
Great! but you shouldn't mix coolants. Unless it was flushed?
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98redaurora
Aurora Driver
This is not your fathers Oldsmobile.
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Post by 98redaurora on Sept 5, 2012 18:01:11 GMT -6
Yeah I flushed it.
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Post by kyngofpop on Sept 9, 2012 17:50:15 GMT -6
The PCM will command fan operation when: Low Speed Fan Operation Engine coolant temperature exceeds approximately 106°C (229°F). Transmission fluid temperature exceeds 150°C (302°F). A/C operation is requested. After the vehicle is shut OFF if the coolant temperature at key-off is more than 151°C (304°F) and system voltage was more than 12 volts. The fans will stay ON for approximately 3 minutes. High Speed Fan Operation Engine coolant temperature reaches 112°C (234°F). Transmission temperature is more than 151°C (304°F). When certain DTCs set. The fans will switch from low to OFF when the coolant drops below 102°C (216°F). The fans will switch from high to low (except DTCs set) when the coolant drops below 106°C (229°F). Check out Bob's Deluxe Cooling Fan Mod in the stickies. Why is it my fans will run Low, and sometimes HI with the A/C on? Mine do the same thing but only at idle or when idling in heavy traffic and when it's very hot outside. I'm certain that it has to do with the a/c pressure switch and the pressures around the condenser instead of the coolant temps *someone correct me if i'm wrong*
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Post by sall on Sept 9, 2012 18:20:31 GMT -6
Nope not unless your coolant temp is 234* or above high speed will not come on(or you have fan mod). There is not a default in the PCM to activate high speed if AC is on unless temp is 234* or above. ECT sensor could be failing.
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Post by kyngofpop on Sept 9, 2012 18:29:25 GMT -6
Coolant temps must be that high with the a/c on then. The a/c and cooling fan operation is the same on my SHO and was the same way on my Merkur Scorpio.
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Post by sall on Sept 9, 2012 18:34:50 GMT -6
Check ECT with scantool next time.
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