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7/26/14 1:29pm - Original Message: 'At what temp should cooling fans start?'
Patteb
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, - Sweden

Vette(s):
Cabriolet 1994, Polo Green Metallic

Joined: 8/10/2013
Posts: 6
I've got a -94 Conv LT1. At highway the temp is around 90-95 C (194-203 F). When at idle, or in town, it can go up to over 110 C (230 F). The primary fan kicks in at 108 C (~226 F). Is that normal? At what temp should secondary fan start?
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7/27/14 2:59pm - Reply: 'Re: At what temp should cooling fans start?'
CaledoniaBrian
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, - Canada

Vette(s):
1988 Convertable

Joined: 11/3/2011
Posts: 148
Completely normal. I have an 88, and the fans on mine kick in at the same temp as you. 108 C. As for the secondary, I'm not sure; mine has never came on, but from what I read this too is normal. Seems very hot to me as well, but this is the way these cars were designed.
 There is ways to change this, but I will leave that to the one with experience in doing so.


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7/28/14 7:18am - Reply: 'Re: At what temp should cooling fans start?'
Patteb
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, - Sweden

Vette(s):
Cabriolet 1994, Polo Green Metallic

Joined: 8/10/2013
Posts: 6
Yes, so I've heard... My problem is that only one of the cooling fans is working, the left one, and that the temp gets high. Also the AC is not working. I went to a local US car workshop today. He made a quick test and said the AC needed refilling. He also said the reson the right hand fan (behind the AC condenser) doesn't work might be that the AC gas level is to low. Can that be correct..? On wednesday I'll refill the AC then we'll see...
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7/28/14 4:30pm - Reply: 'Re: At what temp should cooling fans start?'
LBzr
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Wake Forest, NC - USA

Vette(s):
1996 Collector Edition Convertible

Joined: 11/24/2009
Posts: 15
Very normal. If the A/C is running, the engine temperature runs cooler b/c the fan/fans run constantly.
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7/28/14 4:31pm - Reply: 'Re: At what temp should cooling fans start?'
LBzr
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Wake Forest, NC - USA

Vette(s):
1996 Collector Edition Convertible

Joined: 11/24/2009
Posts: 15
Have the mechanic check for leaks as well. There could a leaky seal somewhere.
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7/29/14 9:52am - Reply: 'Re: At what temp should cooling fans start?'
Corveddie
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Beacon, NY - USA

Vette(s):
1994 convertible, arctic white, black top and interior. LT1 auto.

Joined: 11/29/2009
Posts: 27
What you describe is normal.  The secondary fan comes on at 235 deg F, and is not locked out by low AC refrigerant pressure. 

Corveddie
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7/30/14 9:02am - Reply: 'Re: At what temp should cooling fans start?'
Patteb
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, - Sweden

Vette(s):
Cabriolet 1994, Polo Green Metallic

Joined: 8/10/2013
Posts: 6
Problem solved! I had the AC filled up yesterday and engine temp is now OK, around 92C/200F when driving and 95C/203F when idle. Left fan is now working when the ac is on. Now I sleep like a baby... :-)
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8/13/14 11:42am - Reply: 'Re: At what temp should cooling fans start?'
dvanloon
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Lehigh Acres, FL - USA

Vette(s):
1990 Targa Top 6 speed L98

Joined: 4/14/2014
Posts: 6
I'm driving a 1990 in south Florida and was concerned that only one fan was on most of the time. The second fan is controlled by a pressure switch on the freon line to the A/C coil. I simply unplugged the connector to the pressure switch and both fans run whenever the engine is running.
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10/22/14 7:13pm - Reply: 'Re: At what temp should cooling fans start?'
knnhon
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new poret richey, FL - USA

Vette(s):
1991 Coupe-L-98-auto, 1994 White Conv., l-98 6 spd.

Joined: 10/21/2014
Posts: 13
Has anyone put a 180 degree thermostat in ? I did this on my 454 Vortec Dually. Changed O2 sensors. Temp W/ AC in South Florida in summer never goes above 200 F.   Also, would the 180 thermo preclude the second fan from operating? Corvette america hasa a switch where you can program what temp. for second fan.
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