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Left Vs Right head water temps (with FLIR pictures)

 
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Old 09-05-2017, 03:36 PM
itsnotavan
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Left Vs Right head water temps (with FLIR pictures)

Idled the truck up today and let it get to temp and decided to use the FLIR to see what all was going on. Ive herd before that the right side runs a bit hotter and near as i can tell theres a 16C difference form left to right which is fine because thats the side the heater is on and on the "cold" side of the radiator there is a 9C difference.

I don't expect them to be the same so could i consider this to be normal? or should they be in a closer range to each other



drivers side hot


drivers side return from radiator



passengers side hot



passengers side return


heat loss through the radiator
 
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Old 09-05-2017, 05:03 PM
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I think your engine is running really cool, overall. Too cool. Although if just idling in the driveway, it may not ever get really warm.

Usual difference L-to-R is at most 10 deg F, about 6 deg C.

Once warmed up from driving, in the summer, the outlet pipes should be around 185 - 190 F, you can do the conversion to C. What thermostats do you have in it?

Is that FLIR the one that pops onto a smartphone? They're pretty cool (no pun intended!)!
 
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Old 09-05-2017, 05:31 PM
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That is really neat. Why would your driver's seat return be 9C hotter than the passenger side if your passenger side is hotter?
 
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Old 09-05-2017, 06:40 PM
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Very interesting.
 
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Old 09-06-2017, 12:55 PM
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Originally Posted by ALBUQ F-1 View Post
I think your engine is running really cool, overall. Too cool. Although if just idling in the driveway, it may not ever get really warm.

Usual difference L-to-R is at most 10 deg F, about 6 deg C.

Once warmed up from driving, in the summer, the outlet pipes should be around 185 - 190 F, you can do the conversion to C. What thermostats do you have in it?

Is that FLIR the one that pops onto a smartphone? They're pretty cool (no pun intended!)!
Yes its the FLIR ONE for the iPhone kinda pricy for the size and shape at 200 but the resolution is to the tenth of a degree in both C and F and considering what a real FLIR will set your back this thing is invaluable, i have done all manor of work with it from balancing brakes on multi axle cranes to finding broken wires in our under floor heating.

Not sure what thermostats are in there right now its just whatever was in the truck when i got it.
 
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Old 09-06-2017, 01:11 PM
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Originally Posted by abe View Post
That is really neat. Why would your driver's seat return be 9C hotter than the passenger side if your passenger side is hotter?
2 things I can think of is that the passenger side pump is on its way out with low flow, or turbulence or lack there of in the radiator from 2 deterrent pumps.

who knows how well these pumps flow from one pump to another, the weaker of the 2 will allow the coolant more dwell time and remove more heat before boing back into the suction side of the pump. Once things are further along I may put in a left and right cylinder head temp gauge in the glove box for pice of mind. Oddly enough the bi-metal over temp switch is on the left head.
 
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Old 09-06-2017, 01:29 PM
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Originally Posted by itsnotavan View Post
2 things I can think of is that the passenger side pump is on its way out with low flow, or turbulence or lack there of in the radiator from 2 deterrent pumps.

who knows how well these pumps flow from one pump to another, the weaker of the 2 will allow the coolant more dwell time and remove more heat before boing back into the suction side of the pump. Once things are further along I may put in a left and right cylinder head temp gauge in the glove box for pice of mind. Oddly enough the bi-metal over temp switch is on the left head.
There should be plenty of mixing of the two flows in the upper tank, even if the water leaving the heads is different temps. Water to the pumps should be the same temp.

Is your truck RHD?
 
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Old 09-06-2017, 01:36 PM
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Nope its regular LHD.
 
 
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