a question on programming the cooling fans - Chevy Impala SS Forum
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post #1 of 11 (permalink) Old 10-26-2012, 03:28 PM Thread Starter
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a question on programming the cooling fans

hey guys,

my roadmaster cooling fans start when the temp needle is about half way(the temp gauge)

due to hot weather, i want them to start running on the first quarter (when the water temp is about 80 degrees Celsius ( observed at the climate control)

is it possible to program it through the climate control and/or how?

and what is the best water temp. range does the car need for warming the engine up in winter?

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post #2 of 11 (permalink) Old 10-26-2012, 04:53 PM
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Originally Posted by buick owner View Post
hey guys,

my roadmaster cooling fans start when the temp needle is about half way(the temp gauge)

due to hot weather, i want them to start running on the first quarter (when the water temp is about 80 degrees Celsius ( observed at the climate control)

is it possible to program it through the climate control and/or how?

and what is the best water temp. range does the car need for warming the engine up in winter?

80C is 176F which would be too low. Fans would run all the time as that is the normal running temp as read thru the RM CC. Are you in Canada? Put car, year and location in your signature info.

I like primary to start about 185, secondary about 190.........other users will differ. Amazing how little they actually run with AC off even in hot weather. Key is to have a well maintained cooling system.

You can not program thru the CC - must use a program either by you on a laptop thru OBD port or send out the PCM - tons of threads on this subject.

grandpas wagon
1994 RMW 80K, clear corners, Gary's cables - battery, headlight, mech fan delete, air pump delete, home plate/first base delete, Bill Harper wiper arm mod, Corvette starter, 1LE elbow, Team SS pipe, K&N filter swiss cheese airbox, throttle body bypass, LED headlights.

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Last edited by grandpas wagon; 10-26-2012 at 04:57 PM.
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post #3 of 11 (permalink) Old 10-26-2012, 05:56 PM
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"I like primary to start about 185, secondary about 190..."

That is good if you are using a 160 degree thermostat. Alex programmed mine at about that when I changed it. A 180 degree thermostat starts to open at 180 and your running temps are around 195-200. If you have the 180, they will run all the time at those temps.
Try somthing like 200 and 205. That is substantially lower than the stock settings.

Jim B.

'95 9c1, pcmperformance.com 93 tune, Dynomax Ultraflo catback, K & N box filter, LT4 KM, 160 stat, 3.08 Posi.
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post #4 of 11 (permalink) Old 10-26-2012, 06:24 PM
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Quote:
Originally Posted by fbi9c1 View Post
"I like primary to start about 185, secondary about 190..."

That is good if you are using a 160 degree thermostat. Alex programmed mine at about that when I changed it. A 180 degree thermostat starts to open at 180 and your running temps are around 195-200. If you have the 180, they will run all the time at those temps.
Try somthing like 200 and 205. That is substantially lower than the stock settings.
Exactly right. I should have expanded my post. I do use the 180 thermostat. The CC on the RM reads the lower of the 2 temp sensors.

So when it indicates 175 (my normal running indicated temp), it is really 190 - 195, etc. which would be thermo fully open and leaves some latitude before the fans would come on.

grandpas wagon
1994 RMW 80K, clear corners, Gary's cables - battery, headlight, mech fan delete, air pump delete, home plate/first base delete, Bill Harper wiper arm mod, Corvette starter, 1LE elbow, Team SS pipe, K&N filter swiss cheese airbox, throttle body bypass, LED headlights.

All my posts contain 100% recycled electrons.

Last edited by grandpas wagon; 10-26-2012 at 06:26 PM.
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post #5 of 11 (permalink) Old 10-26-2012, 06:34 PM
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Quote:
Originally Posted by buick owner View Post
what water temp range does the car need for warming the engine up in winter?
My winter cooling system settings:

180F/82C Thermostat [fully open by 196F/91C]
Primary Fan ON 203F/95C
2ndary Fan ON 212F/100C

My winter operating temps are between 194F/90C [highway cruising] and 214F/101C [parked, engine idling at least 20 mins, needle never goes past 2/3 to the right].

Those settings are fine for summer use too, if you don't prefer colder summer settings. (I prefer and use colder summer settings.)

Once the engine [coolant] reaches 194F/90C, my passengers stop complaining about waiting for heating.

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post #6 of 11 (permalink) Old 10-26-2012, 08:07 PM
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Good post Marky as always. But OP has a RM and he is reading from the climate control which are not the same readings you have. 15-20F lower. Somewhere there is a good thread on this subject.

grandpas wagon
1994 RMW 80K, clear corners, Gary's cables - battery, headlight, mech fan delete, air pump delete, home plate/first base delete, Bill Harper wiper arm mod, Corvette starter, 1LE elbow, Team SS pipe, K&N filter swiss cheese airbox, throttle body bypass, LED headlights.

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post #7 of 11 (permalink) Old 10-26-2012, 09:20 PM
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Quote:
Originally Posted by grandpas wagon View Post
Good post Marky as always. But OP has a RM and he is reading from the climate control which are not the same readings you have. 15-20F lower. Somewhere there is a good thread on this subject.
80 Celsius (176 Fahrenheit) is the warmer sensor. The other sensor is about 20 degrees cooler. You can read them both. The Celsius one is correct.
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post #8 of 11 (permalink) Old 10-26-2012, 11:50 PM
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Originally Posted by MillerTimeGS View Post
80 Celsius (176 Fahrenheit) is the warmer sensor. The other sensor is about 20 degrees cooler. You can read them both. The Celsius one is correct.
Yup - good call. Been so long since I did mine.

Read all about it here in this sticky in this section:

https://www.impalassforum.com/vBullet...d.php?t=230311

grandpas wagon
1994 RMW 80K, clear corners, Gary's cables - battery, headlight, mech fan delete, air pump delete, home plate/first base delete, Bill Harper wiper arm mod, Corvette starter, 1LE elbow, Team SS pipe, K&N filter swiss cheese airbox, throttle body bypass, LED headlights.

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post #9 of 11 (permalink) Old 10-27-2012, 12:32 PM
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Originally Posted by Mark Dissod View Post
I've access to TWO readings at all times:
the head temp sender which reports a relative reading to the instrument panel
the CTS, which informs the PCM, which tells the fans when to turn on and off.
Is the RoadMaster Climate Control relaying
a. [water pump] Coolant Temp Sensor readings
b. [head] Coolant Temp Sender-IP readings
c. (what could 'c' be? Never owned a RoadMaster …)
From the RM sticky I linked above:

Here are the most common you will need to know

-00 PCM diagnostics codes
-01 CCM Diagnostic trouble codes
-02 HVAC Diagnostic trouble codes
-03 SIR Diagnostic trouble codes
-04 ABS/TC Diagnostic trouble codes
-06 Engine RPM
-08 Coolant Temp (F) - Reading taken at Cylinder head sensor, typically 20* cooler than the -24 reading
-14 Vehicle speed
-24 Coolant Temp (C) - Reading taken at the Water Pump sensor, This is what the PCM uses to control the fans.


It shows the 2 temp readings - one in F and one in C - so you have apply the formula 9/5 x C + 32 = F to be consistent. Would have made more sense to use the same scale.

So do you have 2 temp gauges, a switching arrangement, or what?

Big thanks to MillerTimeGS for getting me back to reality.

grandpas wagon
1994 RMW 80K, clear corners, Gary's cables - battery, headlight, mech fan delete, air pump delete, home plate/first base delete, Bill Harper wiper arm mod, Corvette starter, 1LE elbow, Team SS pipe, K&N filter swiss cheese airbox, throttle body bypass, LED headlights.

All my posts contain 100% recycled electrons.

Last edited by grandpas wagon; 10-27-2012 at 12:37 PM.
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post #10 of 11 (permalink) Old 11-03-2012, 12:31 PM Thread Starter
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thanks guys

you ve been a good help
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