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#4615404 - 12/27/17 07:14 AM Cold engine light (blue) purpose?
Superflan Offline


Registered: 04/28/15
Posts: 357
Loc: Reunion Island
More and more cars are equipped from the factory with a COLD engine light. What’s the intended purpose of it?
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#4615408 - 12/27/17 07:18 AM Re: Cold engine light (blue) purpose? [Re: Superflan]
mightymousetech Online   happy


Registered: 04/03/17
Posts: 1443
Loc: Ontario, Canada
You are supposed to drive the car gently until warmed up. Blue light on = not warmed up.
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#4615411 - 12/27/17 07:23 AM Re: Cold engine light (blue) purpose? [Re: Superflan]
2015_PSD Offline


Registered: 09/26/10
Posts: 7231
Loc: 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.
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#4615413 - 12/27/17 07:28 AM Re: Cold engine light (blue) purpose? [Re: Superflan]
Donald Offline


Registered: 03/21/04
Posts: 20446
Loc: Upstate NY
I turn the fan to low or off until the blue light goes off. Both Subaru vehicles have a blue light.
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#4615425 - 12/27/17 07:37 AM Re: Cold engine light (blue) purpose? [Re: Donald]
Kira Offline


Registered: 08/19/10
Posts: 5203
Loc: 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?

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#4615430 - 12/27/17 07:39 AM Re: Cold engine light (blue) purpose? [Re: Kira]
mightymousetech Online   happy


Registered: 04/03/17
Posts: 1443
Loc: Ontario, Canada
Originally Posted By: Kira

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


Yes.


Edited by mightymousetech (12/27/17 07:39 AM)
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#4615432 - 12/27/17 07:40 AM Re: Cold engine light (blue) purpose? [Re: 2015_PSD]
opus1 Offline


Registered: 12/13/04
Posts: 2497
Loc: 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.
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#4615437 - 12/27/17 07:42 AM Re: Cold engine light (blue) purpose? [Re: Superflan]
mightymousetech Online   happy


Registered: 04/03/17
Posts: 1443
Loc: 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.
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#4615465 - 12/27/17 08:07 AM Re: Cold engine light (blue) purpose? [Re: Superflan]
Miller88 Offline


Registered: 04/09/08
Posts: 12700
Loc: 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.
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#4615504 - 12/27/17 08:38 AM Re: Cold engine light (blue) purpose? [Re: Superflan]
JohnnyJohnson Offline


Registered: 10/22/09
Posts: 2731
Loc: Wet side WA
Originally Posted By: Superflan
More and more cars are equipped from the factory with a COLD engine light. What’s the intended purpose of it?


They likely charged you $500 for that light!
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#4615510 - 12/27/17 08:42 AM Re: Cold engine light (blue) purpose? [Re: Superflan]
SHOZ Offline


Registered: 06/28/03
Posts: 5744
Loc: 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.
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#4615540 - 12/27/17 09:04 AM Re: Cold engine light (blue) purpose? [Re: Superflan]
spackard Offline


Registered: 03/24/11
Posts: 1714
Loc: 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.

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#4615562 - 12/27/17 09:32 AM Re: Cold engine light (blue) purpose? [Re: Miller88]
Linctex Offline


Registered: 12/31/16
Posts: 6148
Loc: 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".
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#4615581 - 12/27/17 09:57 AM Re: Cold engine light (blue) purpose? [Re: Superflan]
lexus114 Offline


Registered: 05/12/08
Posts: 6298
Loc: Easton, PA
Originally Posted By: Superflan
More and more cars are equipped from the factory with a COLD engine light. What’s 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
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#4615588 - 12/27/17 10:07 AM Re: Cold engine light (blue) purpose? [Re: Superflan]
dishdude Online   content


Registered: 11/14/08
Posts: 8730
Loc: Phoenix
At night it makes me think I have my high beams on. mad
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