adjustable coolant fan temp switch ? where

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Jun 16, 2010 | 09:20 PM

#21

chileverde

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From: Temecula Cali

I believe the knock sensor is between 6 and 8.
the ect sender is in the water manifold, below the pump.

i kinda like the thought of the fan switch at the same location as the ect anyways, making sure they both get similar readings.

besides, the water manifold location is a much easier location to wrench.

rob

Jun 17, 2010 | 01:40 AM

#22

turbodiesel

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From: phx az

Quote:

Originally Posted by rodj

Could have put your new switch in the hole between #6 and 8 .No tee needed

will this work on a 87....swap out 225 temp sensor for 207 temp sensor relay?

just plug and play?

Jun 17, 2010 | 01:53 AM

#23

chileverde

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From: Temecula Cali

yes - on your 87 with a front and rear fan, you will have your front fan turn on at 208 and the rear at 228 if you just plug and play it.

Jun 17, 2010 | 01:58 AM

#24

turbodiesel

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From: phx az

Quote:

Originally Posted by chileverde

yes - on your 87 with a front and rear fan, you will have your front fan turn on at 208 and the rear at 228 if you just plug and play it.

ok is that good enough?

or what do i do just run a jumper wire over to the other relay and it will turn the 2nd fan on to?

Jun 17, 2010 | 02:48 AM

#25

rodj

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Joined: Aug 2000

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From: Australia

Quote:

Originally Posted by chileverde

I believe the knock sensor is between 6 and 8.

Knock sensor(s) is in the block above pan rail

Quote:

Originally Posted by chileverde

the ect sender is in the water manifold, below the pump.

Locations vary by year and engine type
The Coolant Temperature Sensor ( CTS ) the computer uses for turning on main fan is in the intake under the TB on L98's and in the water pump on LT1's
The gauge sender unit could be in LH or RH head depending on L98 year model.Likewise the fan switch ( if fitted )
Positions were reversed in '86

Jun 17, 2010 | 06:33 PM

#26

chileverde

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From: Temecula Cali

Quote:

Originally Posted by turbodiesel

ok is that good enough?

or what do i do just run a jumper wire over to the other relay and it will turn the 2nd fan on to?

you can jumper over to both relays to make them both come on, but I'd do only the one first and see if it does the trick.

both fans running means more amperage requirement which means more power tapped from the motor and lower fuel economy.

Jun 17, 2010 | 06:38 PM

#27

chileverde

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Joined: Mar 2010

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From: Temecula Cali

Quote:

Originally Posted by rodj

The Coolant Temperature Sensor ( CTS ) the computer uses for turning on main fan is in the water pump on LT1's

i know i'm splitting hairs but technically it's in the manifold that houses the pump, not the pump itself.

split #2 - in the GM factory manual, they refer to it as a engine coolant temperature (ect) sensor.

rob

Jun 19, 2010 | 02:09 AM

#28

turbodiesel

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From: phx az

wheres the hot spot to get gm relays and al delco parts wholesale for cheap?..lol

thanks guys

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Jun 19, 2010 | 03:03 AM

#29

turbodiesel

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From: phx az

02-4026 Hypertech Cool Fan Switch [cuts on at 176, off at 166 degrees F] $39.99

02-4028 Hypertech Cool Fan Switch [cuts on at 200, off at 185 degrees F] $39.99

Jet Summit P# JET-60600 on at 200* off at 185* $38.69

or some1 said

Or save some money and buy a Coolant Fan Switch for a 1987 Buick Grand National it comes on at 200 of at 180 IIRC

Last edited by turbodiesel; Jun 19, 2010 at 03:05 AM.

Jun 19, 2010 | 10:19 AM

#30

chileverde

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From: Temecula Cali

If you're running a stock thermostat steer clear of those that turn the fan off at a lower temp than 195 degrees...

you'll be needlessly running your electric fan and that costs mpg/hp, as well as cuts the cooling fan motor life down a bit.

Rob

Sep 6, 2010 | 08:05 PM

#31

george234

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From: Portage Indiana

Fan question.

I have an 87,
So what is wrong with having the main coolant fan run all the time the engine is running, key on- fan runs>>> the thermostat at 195 controls the engine temp, right?<>>> seems simple, ( besides cutting mpg or life of the fan motor?

I am having trouble with mine also, even replaced the ECM and no help.

that is the way the cars use to run, fan runs when engine runs

Any Ideas or input?
george.

Last edited by george234; Sep 6, 2010 at 08:09 PM.