Fan Temperature Switch (2)
Thread Starter
Drifting
Joined: Dec 2002
Posts: 1,474
Likes: 4
From: Tracy CA
Fan Temperature Switch (2)
I read the first post on this subject, got all excited, before I realized that it wasn't for an LT1.
Any way to set the fan up to start at a lower temp in an LT1 without reprogramming the chip?
Thanks!!!
Any way to set the fan up to start at a lower temp in an LT1 without reprogramming the chip?
Thanks!!!
Thread Starter
Drifting
Joined: Dec 2002
Posts: 1,474
Likes: 4
From: Tracy CA
Re: Fan Temperature Switch (vette_dreamer)
Thanks. I'm not looking for a thermostat. I've got the stock 180.
On the freeway, the car runs a consistent 192 F. In all weather conditions. The cooling system works perfectly.
When driving in traffic w/o the AC on, the fans don't kick on till about 238. That just seems ridiculous. Maybe it's perfectly fine - it just bugs me. There are manual switches, or a reprogramming of the ECM as options to change it. As I understand it, the primary fan is controlled by the ECM. The secondary fan is controlled by a temperature activated switch. (I could be wrong)
So changing out the secondary fan switch with one calibrated for a lower temperature is a cheap solution to the heat issue.
That would keep the car at normal temperatures during traffic conditions.
Any thoughts?
On the freeway, the car runs a consistent 192 F. In all weather conditions. The cooling system works perfectly.
When driving in traffic w/o the AC on, the fans don't kick on till about 238. That just seems ridiculous. Maybe it's perfectly fine - it just bugs me. There are manual switches, or a reprogramming of the ECM as options to change it. As I understand it, the primary fan is controlled by the ECM. The secondary fan is controlled by a temperature activated switch. (I could be wrong)
So changing out the secondary fan switch with one calibrated for a lower temperature is a cheap solution to the heat issue.
That would keep the car at normal temperatures during traffic conditions.
Any thoughts?
Melting Slicks
Joined: Jan 2003
Posts: 3,019
Likes: 56
From: North Dallas, TX
Re: Fan Temperature Switch (mitchcole)
When driving in traffic w/o the AC on, the fans don't kick on till about 238. That just seems ridiculous. Maybe it's perfectly fine - it just bugs me. There are manual switches, or a reprogramming of the ECM as options to change it. As I understand it, the primary fan is controlled by the ECM. The secondary fan is controlled by a temperature activated switch. (I could be wrong)
So changing out the secondary fan switch with one calibrated for a lower temperature is a cheap solution to the heat issue.
That would keep the car at normal temperatures during traffic conditions.
Any thoughts?
So changing out the secondary fan switch with one calibrated for a lower temperature is a cheap solution to the heat issue.
That would keep the car at normal temperatures during traffic conditions.
Any thoughts?
I am no expert on this subject. So can't really help you with it. I am actually trying to find out ways of fixing the same "problem"
Racer
Joined: Jan 2003
Posts: 321
Likes: 0
From: Birmingham AL
Re: Fan Temperature Switch (mitchcole)
Both fans are controlled by the ECM
The primary fan (drivers side) comes on when the coolant temp > 226F, Oil temp > 228F, AC high pressure signal is activated or trouble codes 14, 15, 52 or 62 are set. Fan will stay on until the coolant temp drops 41F or the oil temp drops 36F. However minimum time is 30 seconds.
The secondary fan (passengers side) comes on when the coolant temp > 234F, Oil temp > 235F, AC high pressure signal is activated or trouble codes 14, 15, 52 or 62 are set. Fan will stay on until the coolant temp drops 41F or the oil temp drops 36F. However minimum time is 25 seconds.
Vehicle speed sensor will turn the fans off at a certain speed.
Relays are located on the drivers side of the fan shroud.
You can get a manual switch if you wish and ground out the relays and turn the fans on earlier if you wish or have the ECM reprogrammed.
The primary fan (drivers side) comes on when the coolant temp > 226F, Oil temp > 228F, AC high pressure signal is activated or trouble codes 14, 15, 52 or 62 are set. Fan will stay on until the coolant temp drops 41F or the oil temp drops 36F. However minimum time is 30 seconds.
The secondary fan (passengers side) comes on when the coolant temp > 234F, Oil temp > 235F, AC high pressure signal is activated or trouble codes 14, 15, 52 or 62 are set. Fan will stay on until the coolant temp drops 41F or the oil temp drops 36F. However minimum time is 25 seconds.
Vehicle speed sensor will turn the fans off at a certain speed.
Relays are located on the drivers side of the fan shroud.
You can get a manual switch if you wish and ground out the relays and turn the fans on earlier if you wish or have the ECM reprogrammed.
Thread Starter
Drifting
Joined: Dec 2002
Posts: 1,474
Likes: 4
From: Tracy CA
Re: Fan Temperature Switch (jimswhite92)
So, reprogram the ECM or live with it... :cry
OK, I'll live with it. It just seems like an unnecessary strain on all the systems. To put all the effort of dual fans and then not use them.:crazy:
Thanks for the input though!!!
OK, I'll live with it. It just seems like an unnecessary strain on all the systems. To put all the effort of dual fans and then not use them.:crazy:
Thanks for the input though!!!
Instructor
Joined: Mar 2003
Posts: 173
Likes: 0
From: Janesville WI
Re: Fan Temperature Switch (mitchcole)
So, reprogram the ECM or live with it... :cry
OK, I'll live with it. It just seems like an unnecessary strain on all the systems. To put all the effort of dual fans and then not use them.:crazy:
Thanks for the input though!!!
OK, I'll live with it. It just seems like an unnecessary strain on all the systems. To put all the effort of dual fans and then not use them.:crazy:
Thanks for the input though!!!
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Re: Fan Temperature Switch (PIN DR)
I installed an adjustable thermostatic switch with remote bulb $19 and fan relay $12. i strapped the bulb to the upper radiator hose and mounted the switch to the wheel well. don't do it to a show car but it works and does not look bad.