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Old 01-11-2019, 01:31 AM
 
Location: Back and Beyond
2,666 posts, read 2,500,692 times
Reputation: 6196

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2014 jeep patriot, 130k miles.

Whenever it's about -30 degrees or colder out (I live in interior Alaska) my jeep patriot wants to over heat. I've replaced both thermostats, twice. I have the correct antifreeze mixture (tested, and my stored outside extra antifreeze is completely liquid.) I've flushed out and replaced the coolant twice now. Car never overheats in warmer temperatures and does great really down to -30 or so.

Thought I had this problem fixed last winter, but went for a drive tonight at -35 and sure enough the temp gauge started to creep up over the middle mark (which it's not supposed to do), so I turned around and came home. Coolant level is good.

Any ideas on what could be causing this only in super cold temps? Do I have yet another bad thermostat? Am I missing something? Bigger problem? Frustrating....
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Old 01-11-2019, 03:35 AM
 
Location: Vermont
282 posts, read 67,015 times
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Antifreeze Auto Cooling: Premixed or Straight? - Ethylene Glycol (EG)

Quote:
That’s where antifreeze comes in. When mixed in equal parts with water (50/50), antifreeze lowers the freezing point to -35 degrees F
Simply put, your coolant is frozen and not flowing.
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Old 01-11-2019, 08:54 AM
 
Location: Keosauqua, Iowa
8,988 posts, read 15,949,321 times
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Quote:
Originally Posted by EckyX View Post
Antifreeze Auto Cooling: Premixed or Straight? - Ethylene Glycol (EG)



Simply put, your coolant is frozen and not flowing.
I take it you missed this statement:

Quote:
Originally Posted by 6.7traveler View Post
I have the correct antifreeze mixture (tested, and my stored outside extra antifreeze is completely liquid.)
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Old 01-11-2019, 09:27 AM
 
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About the only rational reason would be the coolant is somehow freezing. Outside of that something is not functioning properly, it is a jeep patriot after all.
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Old 01-11-2019, 10:03 AM
 
3,052 posts, read 3,419,742 times
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It may be a bad coolant temp sensor.
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Old 01-11-2019, 01:26 PM
 
Location: Grosse Ile Michigan
25,279 posts, read 60,641,117 times
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It may be an electric cooling fan. I had this problem with a Camaro. It had two cooling fans. One was belt driven (I think) one electric. the electric one was supposed to come on if the engine reached a certain temperature. When it was super cold outside, the electric fan would not come on and the engine would overheat. The solution was to bypass the sensor and just let the fan run all the time. Problem then was it would overcool and freeze up so I had to run concentrated coolant.
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Old 01-11-2019, 01:40 PM
 
Location: Back and Beyond
2,666 posts, read 2,500,692 times
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Quote:
Originally Posted by EckyX View Post
Antifreeze Auto Cooling: Premixed or Straight? - Ethylene Glycol (EG)



Simply put, your coolant is frozen and not flowing.
That's what I would think too, except my coolant is tested and mixed 60/40. My extra pre mixed coolant, stored outside, is completely liquid and not frozen.

Quote:
Originally Posted by dijkstra View Post
About the only rational reason would be the coolant is somehow freezing. Outside of that something is not functioning properly, it is a jeep patriot after all.
Haha, not the biggest fan of the jeep patriot myself, but in its defense, it hasn't had any major problems, besides this over heating thing in 130k+ miles. I agree that the rational reason is coolant freezing, but it shouldn't be.

Quote:
Originally Posted by st33lcas3 View Post
It may be a bad coolant temp sensor.
Thanks, I'll look into that.


Some old timers have told me that the HOAT orange coolant that this thing requires per owners manual, is garbage in these cold temps, and that the system should be flushed very thoroughly and refilled with regular green antifreeze mix. That makes me nervous to do though because the different types of coolant aren't supposed to be mixed and I'd hate to mess anything up.

I guess I'll probably change out both thermostats again, flush coolant, re-mix new 60/40 coolant and refill and see what that does. Hopefully it just warms up too .
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Old 01-11-2019, 01:44 PM
 
Location: Back and Beyond
2,666 posts, read 2,500,692 times
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Quote:
Originally Posted by Coldjensens View Post
It may be an electric cooling fan. I had this problem with a Camaro. It had two cooling fans. One was belt driven (I think) one electric. the electric one was supposed to come on if the engine reached a certain temperature. When it was super cold outside, the electric fan would not come on and the engine would overheat. The solution was to bypass the sensor and just let the fan run all the time. Problem then was it would overcool and freeze up so I had to run concentrated coolant.
Thanks, I'll look into the electric cooling fan coming on or not. That could be an option since crazy electric issues do seem to pop up in extreme cold temps for me.
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Old 01-11-2019, 01:49 PM
 
Location: NE Mississippi
12,122 posts, read 7,773,929 times
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Here's a thought:
The super cold air is blowing on the thermostat housing. That makes the thermostat close.
Meanwhile, back at the temperature sensor for the gauge, there is no blast of super cold air. The liquid is not circulating, so it heats up a little more than normal.


Buy yourself an infrared thermometer. When you think it is over heating stop and immediately read teh temperature of the thermostat housing. It might be a lot lower than you would like.
Then check temperatures at the radiator and so forth. I bet you find out there is no problem at all.
But I'd still insulate the thermostat housing in some way.
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Old 01-11-2019, 02:09 PM
 
Location: Eastern Washington
13,597 posts, read 43,415,753 times
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Quote:
Originally Posted by 6.7traveler View Post
That's what I would think too, except my coolant is tested and mixed 60/40. My extra pre mixed coolant, stored outside, is completely liquid and not frozen.

Haha, not the biggest fan of the jeep patriot myself, but in its defense, it hasn't had any major problems, besides this over heating thing in 130k+ miles. I agree that the rational reason is coolant freezing, but it shouldn't be.

Thanks, I'll look into that.


Some old timers have told me that the HOAT orange coolant that this thing requires per owners manual, is garbage in these cold temps, and that the system should be flushed very thoroughly and refilled with regular green antifreeze mix. That makes me nervous to do though because the different types of coolant aren't supposed to be mixed and I'd hate to mess anything up.

I guess I'll probably change out both thermostats again, flush coolant, re-mix new 60/40 coolant and refill and see what that does. Hopefully it just warms up too .

Remember that this is close to Einstein's definition of insanity - repeating the same procedure and hoping for a different result.



At -30, if you have your heater on full blast, I would think the heater itself would nearly cool the engine.


The old timers may be onto something about that HOAT stuff not working at Alaska temperatures. I have never lived there, but my understanding is that it's a different world and stuff that works fine in the lower 48 sometimes won't work at all in Alaska.



Next time this happens, soon as you turn it off, feel of both upper and lower radiator hoses, or better yet use an infrared "gun" thermometer. If both hoses are hot, you are not rejecting heat into the air for whatever reason. If both are cold, coolant is not flowing, for whatever reason.
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