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Old 07-21-2018, 09:22 AM   #1
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Over heating in town

All of a sudden, with 10k miles on the 2016 Prism, it occasionally overheats when driving in town with all the stop and go driving. It got hot once going up a long grade.


Has anyone else had this happen?

My thoughts are it's most likely a thermostat but I suppose it could be the fan not working at slower speeds. It looks like changing the thermostat could be challenging.


Of course we are on day 2 of a 2k mile, 3 week trip
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Old 07-21-2018, 09:38 AM   #2
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Assuming you've checked your antifreeze level, fans would probably be my first suspect. Make sure your cooling sections (Radiators, Condensers, and any other associated items) are clean of dirt, leaves, etc. Thermostat not opening is a little less suspect if your not running hotter at cruising speeds.
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Old 07-21-2018, 09:43 AM   #3
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A 2016 with only 10K miles the first thing I would check is look and see what has built a nest between the AC condenser and the radiator
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Old 07-21-2018, 09:48 AM   #4
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Quote:
Originally Posted by SeaDog View Post
A 2016 with only 10 miles the first thing I would check is look and see what has built a nest between the AC condenser and the radiator
He said 10k miles. It's been on a few trips.
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Old 07-21-2018, 09:56 AM   #5
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I've come across the issue a few times on tractors and big rig trucks, and it was always low coolant, plugged radiator(s), slipping fan belt (which would cause other problems along with it), thermostat, fan clutch not engaging - in this order.
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Old 07-21-2018, 10:04 AM   #6
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Quote:
Originally Posted by valleyduo View Post
He said 10k miles. It's been on a few trips.
I thought id did an edit of that mistake thanks
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Old 07-21-2018, 10:14 AM   #7
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My first thought is to check the electric fan or clutch fan while it's running hot. It may tell you if your drawing air thru the radiator to keep it cool.
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Old 07-21-2018, 01:16 PM   #8
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Likely an air flow problem if occurring at low speed in town. Not a lot of heat generated at low speed and not much air flow to cool the heat generated. A lot more air flow on the highway, so not likely a thermostat problem, especially given the age and low mileage if not overheating on the highway and only in town. A thermostat doesnít make any cold, it only controls the hot water leaving the engine, so why would it not control it in town, but control it on the highway? If the coach is not equipped with a coolant level sensor, the engine coolant may be low. However, if there is no coolant level sensor, coolant should be visually checked each time the fuel tank is filled. Airflow may be blocked by bug screens, debris, or inoperative fan clutches or fan motors, switches, relays, or fuses that control the fan motor.
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Old 07-21-2018, 01:36 PM   #9
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Check the fan

Quote:
Originally Posted by AudiDudi View Post
All of a sudden, with 10k miles on the 2016 Prism, it occasionally overheats when driving in town with all the stop and go driving. It got hot once going up a long grade.


Has anyone else had this happen?

My thoughts are it's most likely a thermostat but I suppose it could be the fan not working at slower speeds. It looks like changing the thermostat could be challenging.


Of course we are on day 2 of a 2k mile, 3 week trip
Pretty easy to check the fan. Start it, idle it until warm, slow drive in town until it begins to overheat. Pull over, leave engine running, pop hood. Is fan spinning?

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Old 07-21-2018, 02:18 PM   #10
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A Retired Diesel Mechanics Thoughts

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Pretty easy to check the fan. Start it, idle it until warm, slow drive in town until it begins to overheat. Pull over, leave engine running, pop hood. Is fan spinning?

Larry
Because a fan is turning, does not always mean it is working properly. Generally, when an electric fan motor is powered, it is working OK, although if the motor is bad, it may be turning slower than designed. Viscous fan clutches, if equipped, are much more difficult to diagnose because the fan will always turn. When a viscous fan clutch does not fully engage based on temperature, it will turn, yet produce insufficient air flow that can cause engine overheating and poor or no cooling from the air conditioner. Sometimes the only way to diagnose a failing viscus fan clutch is to replace it with a new clutch and see if the cooling problem is eliminated. Viscous clutches are designed to slip and even a small amount of slipping over designed engagement can cause very noticeable problems. Direct belt driven fans are seldom used any more due to wastefulness and noise. However, even a direct belt driven fan can slip if the belt is improperly tensioned or glazed. Electromagnetic clutches will usually burn up and fail if slipping so they are much more easily diagnosed when failed.
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