Some cooling system questions regarding my LT4
Thread Starter
Burning Brakes
Joined: May 1999
Posts: 928
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From: Riverside CA
Some cooling system questions regarding my LT4
I noticed when my car was ideling for a while in my driveway the coolant temp got up to about 220 - 223 degrees, is this normal? And should the fans have kicked on. That seemed really high to me. At what temperature should the fans turn on?
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From: Exit 89 GSP,Lakewood,NJ The Land Of Mojo
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Re: Some cooling system questions regarding my LT4 (90vette)
Not sure when the fans kick on, but those temps are normal for idle(long periods) or sitting in traffic.
On the highway, you should see between 195-210.
On the highway, you should see between 195-210.
Thread Starter
Burning Brakes
Joined: May 1999
Posts: 928
Likes: 0
From: Riverside CA
Re: Some cooling system questions regarding my LT4 (Mr Mojo)
I have been looking through my owners manuel and no where in there does it say when the fan should kick on. I don't get any low coolant lights or anything.
Advanced
Joined: Jun 2001
Posts: 60
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From: Malibu CA
Re: Some cooling system questions regarding my LT4 (90vette)
The main fan kicks on at 228. I'm not sure when or how the aux fan kicks on. Also, its possible to lower the temperature of this engine a great deal. My fan is now set to kick on at 180, and the engine never gets above 185. I also have a thermostat that opens at 160, and the computer has been reprogrammed to turn the fan on at 180, as mentioned above.
Thread Starter
Burning Brakes
Joined: May 1999
Posts: 928
Likes: 0
From: Riverside CA
Re: Some cooling system questions regarding my LT4 (90vette)
I assume in order to lower the point at which the fan turns on i would need a hyper tech? Would a dealership have a way to change this?
Racer
Joined: Sep 2001
Posts: 259
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From: Pontiac IL
Re: Some cooling system questions regarding my LT4 (90vette)
A Hypertach would do it, but the computer can also be reprogrammed. Read the ECM/PCM section to learn more. I do not know the specifics. There is also a way to make a manual switch for your fan to go on specific for a 96 which has OBDII. Some detalis were posted a few months ago here. It also involves the use of a relay. FrankLT4CE
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Drifting
Joined: Aug 2000
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From: Medford, Or
Re: Some cooling system questions regarding my LT4 (90vette)
90vette-A cheap way to turn your fan on is to engage your A/C pump. You can install a thermal switch that will turn your fans on at 180 degree. I install a Hyper Tech 160-degree thermostat and a thermal switch. My C3 runs cool. First I replaced the PCM coolant-sending unit (located on the water pump) with a 3 wire dual purpose-sending unit which includes both the PCM and gauge senders in one unit. The reason I did this is because the sending unit for the gauge doesn't (located in the cylinder head) give accurate reading due to the reverse flow coolant. When I compared the reading from my X-Ray PCM reader, the PCM coolant temperature always read higher than the Temperature gauge. With this new sensor, the temperature reading has been very stable and gives a realistic reading.
PN-10096181 - PCM/Gauge sending unit. Used on the'94 thru '95 LT5 ZR1 Corvette
PN-12102748 - Connector Pigtail
PN-10096181 - PCM/Gauge sending unit. Used on the'94 thru '95 LT5 ZR1 Corvette
PN-12102748 - Connector Pigtail
