Fan temperature switch?
Thread Starter
Burning Brakes
Joined: Dec 1999
Posts: 1,023
Likes: 1
From: New Carlisle, Ohio
Fan temperature switch?
Does anyone have a GM, NAPA, or generic temperature switch part number that will screw into the water jacket in the head, on at 195, off at 180, or something close to or lower than this? I understand this is controlled by the ECM, just wanting a very quick solution, and I'm not ready for the ECM programming yet.
Not interested in those that attach to the radiator or slip into a hose, two bulky.
Hypertech would be OK if necessary, but a "standard" is probably out there.
Thanks
Not interested in those that attach to the radiator or slip into a hose, two bulky.
Hypertech would be OK if necessary, but a "standard" is probably out there.
Thanks
Team Owner
Joined: Mar 2001
Posts: 54,124
Likes: 30
From: Cincinnati, Oh USA
Re: Fan temperature switch? (gene284)
The switch that is in the block between #1 & #3 turns on the auxilliary fan, not the main fan. The main fan is operated by the ecm from temp info from the temp sender under the MAF. The block switch is set for on at 238 F . There are block switches that turn on at a lower temp and with simple wiring, can be made to turn on the main fan.
Thread Starter
Burning Brakes
Joined: Dec 1999
Posts: 1,023
Likes: 1
From: New Carlisle, Ohio
Re: Fan temperature switch? (jfb)
You are correct, the temperature switch you are speaking of normally operates the aux fan. Yes, normally the main fan is operated by the ECM. Don't wish to reprogram the ECM at this time.
The temperature switch here will be used to operate the main fan, in lieu of the ECM. There is no aux fan on this car. (This L98 has a big block Nova radiator!)
Looking for similar switch as used on the aux fan, but with much lower temperature settings (195 on/180off or maybe lower)
Thought someone might know of such a switch, or a listing of such switches on the internet, that one might be selected. Thanks for your input.
Do you happen to know what thread that is in the head?
The temperature switch here will be used to operate the main fan, in lieu of the ECM. There is no aux fan on this car. (This L98 has a big block Nova radiator!)
Looking for similar switch as used on the aux fan, but with much lower temperature settings (195 on/180off or maybe lower)
Thought someone might know of such a switch, or a listing of such switches on the internet, that one might be selected. Thanks for your input.
Do you happen to know what thread that is in the head?
Drifting
Joined: Dec 2002
Posts: 1,474
Likes: 4
From: Tracy CA
Team Owner
Joined: Dec 2000
Posts: 21,094
Likes: 282
From: Phila., PA burbs
Re: Fan temperature switch? (TIMSPEED)
Gene,
Mid-America sells a 200/185 (But mine really turned out to be a 195/180) for $13 under part # 609-106
[Modified by TIMSPEED, 11:39 AM 5/28/2003]
Mid-America sells a 200/185 (But mine really turned out to be a 195/180) for $13 under part # 609-106
[Modified by TIMSPEED, 11:39 AM 5/28/2003]
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: Fan temperature switch? (gene284)
The coolant temp sensor in the front of the block is used by the ECM to control the main fan (behind the radiator).
The coolant temp sensor in the block below #1 & #3 plugs only controls the aux fan (in front of the radiator).
You can wire this aux fan switch into the main fan relay (on the rear of the left inner wheel well) so that it also brings on the main fan; see my C4 Tech Tip. Summit racing may have a HyperTech aux fan switch in your range of interest.
The coolant temp sensor in the block below #1 & #3 plugs only controls the aux fan (in front of the radiator).
You can wire this aux fan switch into the main fan relay (on the rear of the left inner wheel well) so that it also brings on the main fan; see my C4 Tech Tip. Summit racing may have a HyperTech aux fan switch in your range of interest.
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Race Director
Joined: Aug 2002
Posts: 17,367
Likes: 1
From: Kentucky
Re: Fan temperature switch? (65Z01)
You can also buy a in-line plug in connector that causes the computer to think the engine is hotter than it really is. Autozone sells these for the 160 or 180 thermo for $45.
