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  Topic Review (Newest First)
03-12-2019 11:58 AM
mdram4x4 the air does not hit the rear view mirror area. that big plastic thing there keeps it from doing so

design flaw?
03-12-2019 01:37 AM
Jasmine My defroster works fine, but when its below zero from time to time I need to put it on full defrost to keep the edges of the windshield clear, then back to the floor to keep my feet warm. Otherwise the frost starts to creep in. So I'm often switching back and forth.

When its warmer and we get freezing rain (like on my drive downstate on Sunday night) it won't melt the ice off the rear view mirror area. Obviously it doesn't affect my field of vision but I hate hearing the wipers going over the ice.
03-12-2019 12:53 AM
eric Definitely have your compass checked out. That just seems odd. Maybe it's a setting issue if you have automatic climate control.

Mine does a very good job of defrosting in the last few storms. Much better than my wife's Chevy. I have the basic model (sport, 3 classic knobs: speed, temp and direction).
03-03-2019 03:44 PM
mycampbell I live here in Vermont so it is cold, but even in moderate temps I must keep the defrost on fully at all times or the windows will fog up, if I put them even 1/2 defrost and half panel it is not enough to keep up, doesn't seem right compared to other cars.
02-04-2019 11:51 PM
Jasmine I'm not sure when you took your trip, but it was seriously cold for a few days there. The defroster ought to keep the windshield free of ice, except maybe the lower corners. Obviously something is wrong with your rear defroster. IMO mine works better/faster than the front. As for the side windows, I've never had a car that kept them clear when it got severely cold. A couple adults in front sipping coffee, a couple kids in back being kids -- that's a lot of moisture. Maybe if you ran the a/c and the heater together it might dry the warm air.

Give the dealer a chance to fix the rear defroster. Probably something didn't get plugged in at the factory, or maybe a fuse. I once had an Olds that blew the defroster fuse if I didn't shut if off manually. Every time I forgot to <poof!> it blew.
02-04-2019 06:03 PM
Dakota J Storey So to clarify a little, this was on the inside of every window of the car. Before we left the Jeep had warmed to normal operating temp quick as we garage it at night and the garage is heated. After we started driving the windows all fogged over. My theory is that the below zero temps outside cause the fog on the windows inside to freeze. Now it wasn’t like thick ice. It was normal...like scape your window in the morning stuff. We’re going to have the rear glass defrost looked at because obviously that wasn’t working. Im nearly 30 years old so I’ve had a few cars...I’ve never experienced anything like this in any other vehicle. Our next stop will certainly be the dealer and then Jeep cares... maybe some video evidence of it wouldn’t hurt either. It’s just too bad. We’ve always been Jeep owners....we like the compass, but the quirks are sometimes unbearable....
01-31-2019 02:19 PM
Jerry Skrocki Having the climate control set to recirculate air causes excessive window fogging.
01-30-2019 12:02 AM
Jasmine It can be fatal. NH passed "Jessica's Law" named for a girl killed when ice flew off a tractor-trailer causing the accident. Fines can be big, like $500.
01-29-2019 09:59 PM
Tripod
Quote:
Originally Posted by Jasmine View Post
I can't imagine how the inside of the rear window ices up so much that the electric defroster can't melt it, at least enough to loosen it so the rear w/s wiper can clear it. On my Compass, usually the rear melts off faster than the front does.

To OP Dakota: if you've only got 3" clear to see out of, you shouldn't be driving at all. Around here the police will make you clean it off if you're lucky or write you a ticket if you're not so lucky. If you're really unlucky the coroner gets involved.
Yeah snow/ice on a car is dangerous. It can fly up and smash the windshield of a car behind. There is a video of that happening.

01-29-2019 09:12 PM
Jasmine I can't imagine how the inside of the rear window ices up so much that the electric defroster can't melt it, at least enough to loosen it so the rear w/s wiper can clear it. On my Compass, usually the rear melts off faster than the front does.

To OP Dakota: if you've only got 3" clear to see out of, you shouldn't be driving at all. Around here the police will make you clean it off if you're lucky or write you a ticket if you're not so lucky. If you're really unlucky the coroner gets involved.
01-28-2019 08:16 PM
mdram4x4 the rear window uses an electric defroster.

engine temp shouldnt matter
01-28-2019 08:05 PM
Tripod
Quote:
Originally Posted by Jasmine View Post
I'd start by bringing the problem to your dealer unless they have tried and failed to remedy the problem. If they can't help, Jeep Cares is a member on this site. You can send them a PM.

If Tripod is wrong, it could be that something is blocking your defroster from working. Leaves from autumn? Ice in the intake?

I notice that these little engines take awhile to warm up and when its below zero F, if I run my heater on high the engine actually loses temperature. Maybe if you backed the fan down a notch or two the air from the defroster would be warmer and do a better job.

If my windshield is frozen over I'll start my car and put the defroster on the warmest setting and lowest speed. I don't want to hit frozen glass with really hot air. Never happened to me, but I've heard of people cracking their windshields.

I think the reason why it takes so long for the engine to heat up is because of then thermostat/fan settings isnt tuned properly for different ambient temperatures. If you open the coolant temperature tab and watch how the temperature move, you will see it heats up to 120F pretty fast. But that that point, the electronic radiator thermostat partially engages and it starts circulating the coolant from the radiator. Then the coolant temperature stays around 120F for some time until all the cold coolant coming from the radiator is circulated to the engine and heated up to at least 120F. Since the thermostat closes if the coolant temperature falls below 120F and opens the moment it goes above 120F, coolant cant build up any heat until all the coolant within the radiator plus the engine (plus the heater core if heater is on) reaches to at least 120F.

At somewhere around 160F, thermostat is completely open and once you hit 200F, radiator fan engages (I assume fan also has certain settings as it gets loud after ~215F, at some point oil cooler and its fan also turn on). I dont think engine volume has a direct effect on this since larger engines also have more coolant and oil, so overall, they should all heat up similarly. Russian use 1.1 and 1.3 liter Lada Nivas for extended periods of time in Siberia where temperatures are probably way below what we experience here in US.

In older cars, you would need to install different thermostats for winter and summer, just to prevent this issue. But on Compass, for some reason, the thermostat and fan behave almost identically for both summer and winter. Which I think is the reason why it takes so long for the engine to heat up. In my case, engine takes something like ~3 mins to heat up to 120F, but it takes more than 10 mins after that to reach 215F.

I think they should have just made the thermostat open much later if the ambient temperature ,or maybe the oil temperature, is below a certain value. Because in my case, thermostat opens when the oil temperature is still not even registering and it is fully open while oil temperature is half way to optimal (which means there is no reason to start circulating coolant to the radiator).

I also experience the same thing about heater being able to cool the engine . I think this is also due to thermostat settings since both the heater and the thermostat engages at the same temperature of 120F. So if you turn on the heater, you effectively have two locations that heat exchange the temperature and the oil is simply not warm enough to heat up the returning coolant, especially if you are going down hill.

Another thing to keep an eye on is the fact that once you turn on the defroster, it blows air to the glass, at the temperature you set the HVAC to. So if it is set to 72F, it will blow 72F air to glass. All the previous cars I owned blew "max heating" air to the glass on defroster setting, but compass doesn't do that. So if the outside temperature is too low, 72F (or whatever it is) air might not be able to defrost. So for better performance, you might need to manual set the heater temperature to max after turning on the defroster.

The reason why I suggested OP to check for water leaks is the rear window. I have never heard ice building up from the inside on rear window with resistance wiring. Those wires get pretty hot and I cant see how ice can form unless there is excess amounts of water vapor inside the card.
01-28-2019 06:30 PM
Jasmine I'd start by bringing the problem to your dealer unless they have tried and failed to remedy the problem. If they can't help, Jeep Cares is a member on this site. You can send them a PM.

If Tripod is wrong, it could be that something is blocking your defroster from working. Leaves from autumn? Ice in the intake?

I notice that these little engines take awhile to warm up and when its below zero F, if I run my heater on high the engine actually loses temperature. Maybe if you backed the fan down a notch or two the air from the defroster would be warmer and do a better job.

If my windshield is frozen over I'll start my car and put the defroster on the warmest setting and lowest speed. I don't want to hit frozen glass with really hot air. Never happened to me, but I've heard of people cracking their windshields.
01-28-2019 04:52 PM
Tripod I think you have water leaking into your car from somewhere. There is no other way that much of ice can build up on the glass, even if you turned the defroster off.
01-28-2019 09:48 AM
Dakota J Storey
Defrost concerns

Hello all hope all is well. So reaching out to see if anyone has had any defrost/ window fogging issues? We drove from Michigan to Florida this week in the compass and I will say it was dangerous. We left Michigan in a severe winter storm. Now the compass has absolutely awful defrost, but this time was especially bad. The back windows froze over with ice on the inside. The pass and driver door window would only thaw about a 3 inch circle. The front window was bad also. We could only drive with the front defroster on high. Soooo dangerous because we could not see anything around us. Defrost couldn’t keep up until we hit Kentucky. Wonder what the process is for getting in touch with Jeep cares. As far as I’m concerned this vehicle is a hazard if you can’t see out the window! This issue could kill the driver or other ppl. I appreciate it guys and gals! Take care! Dakota

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