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#4557128 - 10/28/17 11:46 AM How hot is the lower radiator hose coolant
SHOZ Offline


Registered: 06/28/03
Posts: 5751
Loc: 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?
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#4557155 - 10/28/17 12:05 PM Re: How hot is the lower radiator hose coolant [Re: SHOZ]
Drew99GT Offline


Registered: 10/11/02
Posts: 22130
Loc: Colorado Springs
I've hit various cars with my infared temp gun; yea, 150F is about right

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#4557156 - 10/28/17 12:07 PM Re: How hot is the lower radiator hose coolant [Re: SHOZ]
user52165 Offline


Registered: 10/21/11
Posts: 1332
Loc: 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


Edited by user52165 (10/28/17 12:10 PM)

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#4557186 - 10/28/17 12:29 PM Re: How hot is the lower radiator hose coolant [Re: SHOZ]
SHOZ Offline


Registered: 06/28/03
Posts: 5751
Loc: Illinois
More interested really in winter time temps with reference to how much if any the cold side heats the AT fluid.
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#4557189 - 10/28/17 12:30 PM Re: How hot is the lower radiator hose coolant [Re: SHOZ]
mk378 Offline


Registered: 09/27/15
Posts: 1421
Loc: 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.

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#4557192 - 10/28/17 12:34 PM Re: How hot is the lower radiator hose coolant [Re: SHOZ]
WyrTwister Offline


Registered: 01/13/13
Posts: 1532
Loc: 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
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#4557195 - 10/28/17 12:36 PM Re: How hot is the lower radiator hose coolant [Re: SHOZ]
SHOZ Offline


Registered: 06/28/03
Posts: 5751
Loc: 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.
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#4557208 - 10/28/17 12:45 PM Re: How hot is the lower radiator hose coolant [Re: SHOZ]
SHOZ Offline


Registered: 06/28/03
Posts: 5751
Loc: 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.
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#4557210 - 10/28/17 12:46 PM Re: How hot is the lower radiator hose coolant [Re: SHOZ]
SHOZ Offline


Registered: 06/28/03
Posts: 5751
Loc: Illinois
And what of the older style top to bottom radiators? I have one in my Accent.
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#4557215 - 10/28/17 12:54 PM Re: How hot is the lower radiator hose coolant [Re: SHOZ]
Yah-Tah-Hey Offline


Registered: 05/26/14
Posts: 3413
Loc: 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.

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#4557249 - 10/28/17 01:12 PM Re: How hot is the lower radiator hose coolant [Re: SHOZ]
Chris142 Offline


Registered: 06/05/03
Posts: 16843
Loc: Deplorable in apple valley, ca
Needs to be at least 30f cooler than the water going in.
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#4557321 - 10/28/17 02:30 PM Re: How hot is the lower radiator hose coolant [Re: SHOZ]
Linctex Offline


Registered: 12/31/16
Posts: 6178
Loc: 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.
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#4557416 - 10/28/17 04:02 PM Re: How hot is the lower radiator hose coolant [Re: Linctex]
user52165 Offline


Registered: 10/21/11
Posts: 1332
Loc: CA
FWIW - OP was asking about summer with AC on.

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#4557420 - 10/28/17 04:08 PM Re: How hot is the lower radiator hose coolant [Re: user52165]
SHOZ Offline


Registered: 06/28/03
Posts: 5751
Loc: 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.
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#4557960 - 10/29/17 12:48 AM Re: How hot is the lower radiator hose coolant [Re: SHOZ]
DoubleWasp Offline


Registered: 05/21/12
Posts: 5236
Loc: 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.
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