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How hot is the lower radiator hose coolant #4557128
10/28/17 11:46 AM
10/28/17 11:46 AM
Joined: Jun 2003
Posts: 5,920
Illinois
SHOZ Offline OP
SHOZ  Offline OP
Joined: Jun 2003
Posts: 5,920
Illinois
I've always wondered just how hot is the coolant entering the engine after leaving the radiator?

Assuming a crossflow radiator and taking into account the ambient temps. 150F in the summer with AC on for coolant?


2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual
Re: How hot is the lower radiator hose coolant [Re: SHOZ] #4557155
10/28/17 12:05 PM
10/28/17 12:05 PM
Joined: Oct 2002
Posts: 22,158
Colorado Springs
Drew99GT Offline
Drew99GT  Offline
Joined: Oct 2002
Posts: 22,158
Colorado Springs
I've hit various cars with my infared temp gun; yea, 150F is about right

Re: How hot is the lower radiator hose coolant [Re: SHOZ] #4557156
10/28/17 12:07 PM
10/28/17 12:07 PM
Joined: Oct 2011
Posts: 1,372
CA
user52165 Offline
user52165  Offline
Joined: Oct 2011
Posts: 1,372
CA
I would bet quite a bit higher. The actual interior temp of the coolant is warmer than the hose exterior.

https://www.harborfreight.com/non-contact-infrared-thermometer-with-laser-targeting-60725.html

Last edited by user52165; 10/28/17 12:10 PM.
Re: How hot is the lower radiator hose coolant [Re: SHOZ] #4557186
10/28/17 12:29 PM
10/28/17 12:29 PM
Joined: Jun 2003
Posts: 5,920
Illinois
SHOZ Offline OP
SHOZ  Offline OP
Joined: Jun 2003
Posts: 5,920
Illinois
More interested really in winter time temps with reference to how much if any the cold side heats the AT fluid.


2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual
Re: How hot is the lower radiator hose coolant [Re: SHOZ] #4557189
10/28/17 12:30 PM
10/28/17 12:30 PM
Joined: Sep 2015
Posts: 1,523
USA
mk378 Offline
mk378  Offline
Joined: Sep 2015
Posts: 1,523
USA
It will go down when the car is moving and there is a good air flow. Many cars sense the temperature of the coolant in the lower hose or the bottom of the radiator to decide when to turn the fan on.

Re: How hot is the lower radiator hose coolant [Re: SHOZ] #4557192
10/28/17 12:34 PM
10/28/17 12:34 PM
Joined: Jan 2013
Posts: 1,841
Texas
WyrTwister Offline
WyrTwister  Offline
Joined: Jan 2013
Posts: 1,841
Texas
Let us suppose you have a 190 fegree thermostat . Suppose the dash temp gauge is showing 200F and further suppose that is accurate .

I am guessing the coolant temp of the coolant entering the radiator will be close to 200F . The leaving coolant temperature is going to be less . By how much , which is in effect what you are asking .

As you implies , that can vary , depending on the ambient temp , vehicle speed / amount of ram air , radiator fan efficiency , amount of air restriction due to other " coolers " in front of the radiator . And , probably other things which do not come to mind .

But , I never actually thought about the actual temp . As long as problema did not occur , I was happy .

Best wishes , :-0


Wyr
God bless
Re: How hot is the lower radiator hose coolant [Re: SHOZ] #4557195
10/28/17 12:36 PM
10/28/17 12:36 PM
Joined: Jun 2003
Posts: 5,920
Illinois
SHOZ Offline OP
SHOZ  Offline OP
Joined: Jun 2003
Posts: 5,920
Illinois
I've never seen anything other than a temp sender in the t-stat area for temp control. I do personally have a stand alone temp sensor in the upper hose for control because tune.

On four of my last five cars they all had the t-stat on the lower radiator hose entry point on the engine.


2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual
Re: How hot is the lower radiator hose coolant [Re: SHOZ] #4557208
10/28/17 12:45 PM
10/28/17 12:45 PM
Joined: Jun 2003
Posts: 5,920
Illinois
SHOZ Offline OP
SHOZ  Offline OP
Joined: Jun 2003
Posts: 5,920
Illinois
I feel that when it's quite cold out that the cold side of the radiator is not hot enough to heat the at fluid. This comes up when some replace the AT radiator with one without a cooler in it.

Many say to keep the cooler so it adds heat in the winter. I don't see that happening if the fluid is much over 125F which is what my trans fluid would run in the winter with an air to oil trans cooler.

I suppose I could attach an external probe to a stand alone temp sensor and insulate it.


2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual
Re: How hot is the lower radiator hose coolant [Re: SHOZ] #4557210
10/28/17 12:46 PM
10/28/17 12:46 PM
Joined: Jun 2003
Posts: 5,920
Illinois
SHOZ Offline OP
SHOZ  Offline OP
Joined: Jun 2003
Posts: 5,920
Illinois
And what of the older style top to bottom radiators? I have one in my Accent.


2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual
Re: How hot is the lower radiator hose coolant [Re: SHOZ] #4557215
10/28/17 12:54 PM
10/28/17 12:54 PM
Joined: May 2014
Posts: 3,662
Columbus,Nebraska
Yah-Tah-Hey Offline
Yah-Tah-Hey  Offline
Joined: May 2014
Posts: 3,662
Columbus,Nebraska
I think it depends on the ambient air and air flow. Also on cooling system efficiency. I had a 84 Honda Accord that had a cooling system so efficient that I could completely block the radiator during Colorado winters and still have marginal heater output in spite of being hooked up to a 240 volt powerplant parking outlet. The Camry I now drive has a well designed cooling system. Defrost is available by the time I back out of the garage. Find someone with a thermal imager and check it out.

Re: How hot is the lower radiator hose coolant [Re: SHOZ] #4557249
10/28/17 01:12 PM
10/28/17 01:12 PM
Joined: Jun 2003
Posts: 17,343
Deplorable in apple valley, ca
Chris142 Online content
Chris142  Online Content
Joined: Jun 2003
Posts: 17,343
Deplorable in apple valley, ca
Needs to be at least 30f cooler than the water going in.


02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: How hot is the lower radiator hose coolant [Re: SHOZ] #4557321
10/28/17 02:30 PM
10/28/17 02:30 PM
Joined: Dec 2016
Posts: 6,226
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,226
Waco, TX
In the wintertime with "No cardboard in front",
I have seen lower radiator hose temps around 45*F when it's -40*F

That's with the engine at normal operating temp and a .062" air bleed hole drilled in the flange of the thermostat. The heater was also on. Most of the engine heat is lost through the heater core when it's that cold outside.


"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: How hot is the lower radiator hose coolant [Re: Linctex] #4557416
10/28/17 04:02 PM
10/28/17 04:02 PM
Joined: Oct 2011
Posts: 1,372
CA
user52165 Offline
user52165  Offline
Joined: Oct 2011
Posts: 1,372
CA
FWIW - OP was asking about summer with AC on.

Re: How hot is the lower radiator hose coolant [Re: user52165] #4557420
10/28/17 04:08 PM
10/28/17 04:08 PM
Joined: Jun 2003
Posts: 5,920
Illinois
SHOZ Offline OP
SHOZ  Offline OP
Joined: Jun 2003
Posts: 5,920
Illinois
Originally Posted By: user52165
FWIW - OP was asking about summer with AC on.
Yes. But the cold end too.

Many argue that the atf cooler in the radiator heats the fluid up but I don't see that happening in the dead of winter.


2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual
Re: How hot is the lower radiator hose coolant [Re: SHOZ] #4557960
10/29/17 12:48 AM
10/29/17 12:48 AM
Joined: May 2012
Posts: 5,363
Fort Lauderdale, FL
DoubleWasp Offline
DoubleWasp  Offline
Joined: May 2012
Posts: 5,363
Fort Lauderdale, FL
I'm not seeing the ATF heating going on either. Some manufacturers even claim the opposite, that the ATF will help heat the engine.

Does ATF even need to be heated? Many manufacturers claim a decently hot ATF is a more efficient trans, but is it doing anything for operation or durability? I've never had any "cold transmission" problems in my life.


07 Lincoln Navigator M1 0w-40/FU
68 Charger R/T / Supercharged 440 VR1/DBL7349
07 Ram 3500 4x4 / Cummins 6.7 /DBL7349
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