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Cold engine light (blue) purpose? #4615404
12/27/17 08:14 AM
12/27/17 08:14 AM
Joined: Apr 2015
Posts: 386
Reunion Island
Superflan Offline OP
Superflan  Offline OP
Joined: Apr 2015
Posts: 386
Reunion Island
More and more cars are equipped from the factory with a COLD engine light. Whatís the intended purpose of it?


Peugeot Partner 1.9 D, 5W40 C3, 245000 Km, running on WVO
Wife's Mitsubishi Outlander PHEV, dealerís overfilled, 16000 Km
Re: Cold engine light (blue) purpose? [Re: Superflan] #4615408
12/27/17 08:18 AM
12/27/17 08:18 AM
Joined: Apr 2017
Posts: 1,480
Ontario, Canada
mightymousetech Offline
mightymousetech  Offline
Joined: Apr 2017
Posts: 1,480
Ontario, Canada
You are supposed to drive the car gently until warmed up. Blue light on = not warmed up.


Mighty Mouse Tech
BMW Tech, Former Acura Tech
2010 Civic Si Castrol 0W40, Redline MTL
2013 BMW 135i M Sport Edition Castrol 0W40, Redline MTL
Re: Cold engine light (blue) purpose? [Re: Superflan] #4615411
12/27/17 08:23 AM
12/27/17 08:23 AM
Joined: Sep 2010
Posts: 7,560
SE Texas
2015_PSD Offline
2015_PSD  Offline
Joined: Sep 2010
Posts: 7,560
SE Texas
The last time I saw one of those was in my Dad's 1966 Ford Galaxie 500. He would have me go out and crank it (fun times for a 10 year old) and set the heater in the winter or the A/C in the summer. I would then go check and see if the light was out and he would head off to work. He did shift work, so I would only be able to do it in the evenings and would race home from school. Good memories.


2018 MB AMG GLC43 3.0L Coupe - Castrol 0W-40/Purflux
2018 MB C300 2.0L - M1 0W-40/OEM
2015 F-250 6.7L PS Diesel - Delo 15W-40/CQ Blue
2014 Explorer 3.5L Limited - M1 AFE 0W-20/FU
Re: Cold engine light (blue) purpose? [Re: Superflan] #4615413
12/27/17 08:28 AM
12/27/17 08:28 AM
Joined: Mar 2004
Posts: 20,758
Upstate NY
Donald Offline
Donald  Offline
Joined: Mar 2004
Posts: 20,758
Upstate NY
I turn the fan to low or off until the blue light goes off. Both Subaru vehicles have a blue light.


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: Cold engine light (blue) purpose? [Re: Donald] #4615425
12/27/17 08:37 AM
12/27/17 08:37 AM
Joined: Aug 2010
Posts: 5,681
Champlain/Hudson Valley
Kira Online content
Kira  Online Content
Joined: Aug 2010
Posts: 5,681
Champlain/Hudson Valley
My Dad's 1954 DeSoto Firedome had a blue COLD light.

I wasn't to see another COLD light until my sister's 2012 Mazda3.

One day immediately after the COLD light went out I turned the heater on. The COLD light came back on.

Did the cold coolant in the heater core drop the system temp or was the light programmed to come on with the heater below a certain point?

Re: Cold engine light (blue) purpose? [Re: Kira] #4615430
12/27/17 08:39 AM
12/27/17 08:39 AM
Joined: Apr 2017
Posts: 1,480
Ontario, Canada
mightymousetech Offline
mightymousetech  Offline
Joined: Apr 2017
Posts: 1,480
Ontario, Canada
Originally Posted By: Kira

Did the cold coolant in the heater core drop the system temp


Yes.

Last edited by mightymousetech; 12/27/17 08:39 AM.

Mighty Mouse Tech
BMW Tech, Former Acura Tech
2010 Civic Si Castrol 0W40, Redline MTL
2013 BMW 135i M Sport Edition Castrol 0W40, Redline MTL
Re: Cold engine light (blue) purpose? [Re: 2015_PSD] #4615432
12/27/17 08:40 AM
12/27/17 08:40 AM
Joined: Dec 2004
Posts: 2,532
Chicago Area
opus1 Offline
opus1  Offline
Joined: Dec 2004
Posts: 2,532
Chicago Area
Originally Posted By: 2015_PSD
The last time I saw one of those was in my Dad's 1966 Ford Galaxie 500. He would have me go out and crank it (fun times for a 10 year old) and set the heater in the winter or the A/C in the summer. I would then go check and see if the light was out and he would head off to work. He did shift work, so I would only be able to do it in the evenings and would race home from school. Good memories.


My Dad's Pontiac Star Chief was the last time I saw one of these. What's old is new again.


Current Fleet:

2010 Hyundai Sonata GLS
2009 Chevy Cobalt SS Sedan (yes,the turbo)
2002 Dodge Dakota SXT Club Cab
1994 Ford Ranger XLT (RIP, Dad)
Re: Cold engine light (blue) purpose? [Re: Superflan] #4615437
12/27/17 08:42 AM
12/27/17 08:42 AM
Joined: Apr 2017
Posts: 1,480
Ontario, Canada
mightymousetech Offline
mightymousetech  Offline
Joined: Apr 2017
Posts: 1,480
Ontario, Canada
Really, the blue light is no different than a "temp" gauge in modern cars, unless it is a German car. The new "temp" gauge is nothing more than a three position light, cold/normal/hot.


Mighty Mouse Tech
BMW Tech, Former Acura Tech
2010 Civic Si Castrol 0W40, Redline MTL
2013 BMW 135i M Sport Edition Castrol 0W40, Redline MTL
Re: Cold engine light (blue) purpose? [Re: Superflan] #4615465
12/27/17 09:07 AM
12/27/17 09:07 AM
Joined: Apr 2008
Posts: 12,863
Onondaga County
Miller88 Offline
Miller88  Offline
Joined: Apr 2008
Posts: 12,863
Onondaga County
No temp gauge in my Subaru so that's all I have. It's more than the temp gauge in previous Fords I have had. At least it means something.

I'm not sure of the coolant temp, but that goes out when the engine oil reaches 86F

That also is at the same time the computer kicks down the cold idle.


18 Forester 2.5I 6M
00 Jeep Cherokee
01 Ford F-350 XL 4x4 5M
Re: Cold engine light (blue) purpose? [Re: Superflan] #4615504
12/27/17 09:38 AM
12/27/17 09:38 AM
Joined: Oct 2009
Posts: 3,223
Wet side WA
JohnnyJohnson Offline
JohnnyJohnson  Offline
Joined: Oct 2009
Posts: 3,223
Wet side WA
Originally Posted By: Superflan
More and more cars are equipped from the factory with a COLD engine light. Whatís the intended purpose of it?


They likely charged you $500 for that light!


2004 Corolla 124805
Out: VML 5w-30 TG4967 OCI 5007 Miles
In: EDGE EP 5W-30 Bosch 3311 122537 7-18-18
2006 Duramax 74277
Out: T6 5W-40 M1-303
In: T6 5W-40 XG9100 74705 4-22-18
Re: Cold engine light (blue) purpose? [Re: Superflan] #4615510
12/27/17 09:42 AM
12/27/17 09:42 AM
Joined: Jun 2003
Posts: 5,921
Illinois
SHOZ Offline
SHOZ  Offline
Joined: Jun 2003
Posts: 5,921
Illinois
My Hyundai Accent has the blue and red temp light. I have never seen the red one while driving. The blue shuts off at ~150F.

My Genesis Coupe has a temperature gauge that is useless. You can't tell from the gauge needle if the temp is 160F or 195F. There is no movement of the needle in that range. It would be better to have the blue and red lights.


2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual
Re: Cold engine light (blue) purpose? [Re: Superflan] #4615540
12/27/17 10:04 AM
12/27/17 10:04 AM
Joined: Mar 2011
Posts: 1,812
CA
spackard Offline
spackard  Offline
Joined: Mar 2011
Posts: 1,812
CA
Didn't one use the COLD light to remind you to pump the accelerator pedal twice before cranking?
Then, in the late '70s, the 3000 RPM cold idle audibly told you the engine was cold.

Re: Cold engine light (blue) purpose? [Re: Miller88] #4615562
12/27/17 10:32 AM
12/27/17 10:32 AM
Joined: Dec 2016
Posts: 6,251
Waco, TX
Linctex Online content
Linctex  Online Content
Joined: Dec 2016
Posts: 6,251
Waco, TX
Originally Posted By: Miller88
It's more than the temp gauge in previous Fords I have had. At least it means something.



???

Ford temp gauges are always functional...

It's the oil pressure gauges that are just a "glorified idiot light".


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Cold engine light (blue) purpose? [Re: Superflan] #4615581
12/27/17 10:57 AM
12/27/17 10:57 AM
Joined: May 2008
Posts: 6,298
Easton, PA
lexus114 Offline
lexus114  Offline
Joined: May 2008
Posts: 6,298
Easton, PA
Originally Posted By: Superflan
More and more cars are equipped from the factory with a COLD engine light. Whatís the intended purpose of it?


this is funny. my buddies dads 1968 ford station wagon had a blue cold light on the dash until it warmed up. 390 cid engine


2017 Mercedes-Benz C300 4matic coupe 2.0 turbo
2016 Lexus RX 350 Autumn Shimmer AWD
Re: Cold engine light (blue) purpose? [Re: Superflan] #4615588
12/27/17 11:07 AM
12/27/17 11:07 AM
Joined: Nov 2008
Posts: 9,045
Phoenix
dishdude Offline
dishdude  Offline
Joined: Nov 2008
Posts: 9,045
Phoenix
At night it makes me think I have my high beams on. mad


2018 Challenger SRT
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