[JoshuaevansF87]

Got a engine temp warning. I was aware of the issue I dropped my car off for downpipes and jb4 and my guy said I had a very small coolant leak from one of the hoses. It's not even leaking out it's more sweating there's no coolant leaking on the floor and I drove the car home fine. I ordered a replacement hose but outta stock until mid march anyone else have a issue like this?

[Grumpy514]

Did the coolant leak happen before or after the install? I know that map can be disturbed/removed from bracket when trying to access the MAP sensor which is below that.

Usually coolant gets crusty like that when it gets super hot. Perhaps an air pocket in coolant system? You ordered the rubber hose itself? Hopefully not an issue with your pump.

[JoshuaevansF87]

Originally Posted by Grumpy514

Did the coolant leak happen before or after the install? I know that map can be disturbed/removed from bracket when trying to access the MAP sensor which is below that.

Usually coolant gets crusty like that when it gets super hot. Perhaps an air pocket in coolant system? You ordered the rubber hose itself? Hopefully not an issue with your pump.

I guess it happened before install because he sent me those pics while he was installing the Jb4 and yeah I had the shop order a new hose. But I never had this come up before but I also haven't been driving the car much because winter months so I'm not really sure if it was leaking before.

[BGM-M3COMP]

This is concerning because this isn't the first time i'm seeing an issue relating to coolant lost.

Not to mention i wonder about my car because i have the water temp gauge in my gauge pocket and sometimes i'll be driving and i see the temp gauge sit at 210F, then all of a sudden i see it drop down to what looks like to be in the 170-180F range. Then sometimes i'll see it a bit past 210F to what looks like 220F.

This is in current northeast weather so it's cold out. Plus when i'm noticing these odd readings i'm always on the move and not sitting at a light.

I don't smell coolant nor am i losing any. But now i feel like i gotta check all those hoses now.

[Grumpy514]

Originally Posted by BGM-M3COMP

This is concerning because this isn't the first time i'm seeing an issue relating to coolant lost.

Not to mention i wonder about my car because i have the water temp gauge in my gauge pocket and sometimes i'll be driving and i see the temp gauge sit at 210F, then all of a sudden i see it drop down to what looks like to be in the 170-180F range. Then sometimes i'll see it a bit past 210F to what looks like 220F.

This is in current northeast weather so it's cold out. Plus when i'm noticing these odd readings i'm always on the move and not sitting at a light.

I don't smell coolant nor am i losing any. But now i feel like i gotta check all those hoses now.

Thankfully a trained tech can usually tell if you have a coolant leak just by opening up the hood and taking a deep breath/smell. I've had so many vehicles come in where I will pop the hood for a check up & soon as the hood flys open you get a waft of coolant smell. It is very distinct. Ideally you want the car to be warm so the smell can permeate.


Hoping just some air pockets in these vehicles and nothing major..... When you vehicle is jumping around is it in between driving and coming to a stop or it's bouncing around while driving?

[BGM-M3COMP]

Originally Posted by Grumpy514

Thankfully a trained tech can usually tell if you have a coolant leak just by opening up the hood and taking a deep breath/smell. I've had so many vehicles come in where I will pop the hood for a check up & soon as the hood flys open you get a waft of coolant smell. It is very distinct. Ideally you want the car to be warm so the smell can permeate.


Hoping just some air pockets in these vehicles and nothing major..... When you vehicle is jumping around is it in between driving and coming to a stop or it's bouncing around while driving?

I came from modified cars my whole life, i too know when i have a coolant leak or something. That smell is very familiar to me lol.

The gauge isn't really jumping around per say, but if i notice my temp gauge at 210, then after a few minutes of highway driving i'll notice it below 210 (yes i know because of air flow while moving), but then randomly i'll see it past 210 as well. As if the reading is inaccurate showing random readings in your gauge cluster.

[Limegrntaln]

I've actually smelled coolant, after running my car, hard a few times. I open the hood, and can't actually smell coolant under the hood. Not sure where its coming from, I've smelled it 2-3 times, and I'm not even 100% sure its my car.

But it just seems like a coincidence, that I would get done running it hard, and stop at a light with the windows down, sometimes with other cars around, and it smells like its coming from my car. I've never noticed any temperature issues, though.

[JoshuaevansF87]

So I started it up this morning and as soon as I started it I got engine temp warning. I turned it off disabled Jb4 turned it back on and same thing.

[JoshuaevansF87]

Update the reservoir tank was pretty much empty gonna refill it and wait till the hose comes in witch is about 3 weeks :

[Grumpy514]

Originally Posted by JoshuaevansF87

Update the reservoir tank was pretty much empty gonna refill it and wait till the hose comes in witch is about 3 weeks :

Yeah that's no good, it's possible it had an air pocket from factory after not properly being bled. Fill her up & pressure test the system.

I would say take it in to dealer to get looked at but with the mods you have...I'd talk to them first and see how they feels about mods being on there. Not going to have anything to do with them but dealerships are crooks.

[JoshuaevansF87]

Originally Posted by Grumpy514

Yeah that's no good, it's possible it had an air pocket from factory after not properly being bled. Fill her up & pressure test the system.

I would say take it in to dealer to get looked at but with the mods you have...I'd talk to them first and see how they feels about mods being on there. Not going to have anything to do with them but dealerships are crooks.

Idk about taking to it the dealer I don't think they'll like my mods lol once the hose comes in I have a shop that'll handle it. If I know the hose is leaking why is a pressure test necessary?

[Grumpy514]

Originally Posted by JoshuaevansF87

Idk about taking to it the dealer I don't think they'll like my mods lol once the hose comes in I have a shop that'll handle it. If I know the hose is leaking why is a pressure test necessary?

Peace of mind. You don't have to have a leak test done but I usually like to find out about leaks myself than having a coolant light flash on to tell me when it has been spraying everywhere or possibly overheat the car. I would hope there are no other leaks but who knows. Replacing just that hose will probably be it.

[smaglik]

Top the coolant off, and run the bleed procedure...i presume it's the same sequence as older electric coolant pumps?

[JoshuaevansF87]

I ran the bleed procedure replaced a hose with a new one and after about five minutes of driving the engine temp came back on. I am running jb4 not sure if that has something to do with it. The car is showing engine temp too high but the code is reading engine temperature too low. Any ideas on what it can be?

[Ximian]

Originally Posted by JoshuaevansF87

I ran the bleed procedure replaced a hose with a new one and after about five minutes of driving the engine temp came back on. I am running jb4 not sure if that has something to do with it. The car is showing engine temp too high but the code is reading engine temperature too low. Any ideas on what it can be?

Your thermostat might be broken.

[JoshuaevansF87]

Originally Posted by Ximian

Your thermostat might be broken.

That's what I was thinking. The shop is telling me it could be a water pump and thermostat issue but they don't know for sure. Might just take off my mods and go to bmw

[G80M3andMe]

Any update on this? I have a JB4 hooked up and never have flashed a tune just using it for diagnostics in real time. My coolant Wiley fluctuates between 210-221 just easy driving I.e. cruising on the highway at 70mph getting 41 mpg and it still crawls up to 221. When I floor it the temps drop down to 164. Haven’t gotten a coolant warning. I am pretty sure I have air in my coolant because there is a toilet bowl pissing sound/you’ve just turned your tub to shower and can hear the air running through the pipe. I’ve cracked the coolant lid after running it hot and seen steam come out and watched the coolant surge up and flow back down as well. I bought a burping kit but couldn’t get it to burp. I can’t find the damn bleeder screw!

[JoshuaevansF87]

Originally Posted by G80M3andMe

Any update on this? I have a JB4 hooked up and never have flashed a tune just using it for diagnostics in real time. My coolant Wiley fluctuates between 210-221 just easy driving I.e. cruising on the highway at 70mph getting 41 mpg and it still crawls up to 221. When I floor it the temps drop down to 164. Haven’t gotten a coolant warning. I am pretty sure I have air in my coolant because there is a toilet bowl pissing sound/you’ve just turned your tub to shower and can hear the air running through the pipe. I’ve cracked the coolant lid after running it hot and seen steam come out and watched the coolant surge up and flow back down as well. I bought a burping kit but couldn’t get it to burp. I can’t find the damn bleeder screw!

The end result for me was that the JB4 was installed incorrectly and it was tricking the thermostat into not opening or closing so the car was running hot. I also did have a coolant leak in my hose that was fixed but I took everything off and went to Bmw and they reflashed the car and that did the trick. I am no longer running JB4

[Shaneartistry]

Originally Posted by G80M3andMe

Any update on this? I have a JB4 hooked up and never have flashed a tune just using it for diagnostics in real time. My coolant Wiley fluctuates between 210-221 just easy driving I.e. cruising on the highway at 70mph getting 41 mpg and it still crawls up to 221. When I floor it the temps drop down to 164. Haven’t gotten a coolant warning. I am pretty sure I have air in my coolant because there is a toilet bowl pissing sound/you’ve just turned your tub to shower and can hear the air running through the pipe. I’ve cracked the coolant lid after running it hot and seen steam come out and watched the coolant surge up and flow back down as well. I bought a burping kit but couldn’t get it to burp. I can’t find the damn bleeder screw!

On a side note…you’re able to get 41 mpg?! I have a 6MT and the best I’ve been able to do is 24.5 mpg at 70 mph or so.

[G80M3andMe]

Originally Posted by Shaneartistry

On a side note…you’re able to get 41 mpg?! I have a 6MT and the best I’ve been able to do is 24.5 mpg at 70 mph or so.

I am up in the north east, kinda hilly, so going north I average about 28mpg but coming back home going south which is more down hill I get 39-41 if no traffic. I just use my big toe and go very light on the pedal. Have the ZF8 though not MT. Any idea where the bleeder screw is? I installed the JB4 myself and don’t believe I installed it wrong.

[G80M3andMe]

Originally Posted by JoshuaevansF87

The end result for me was that the JB4 was installed incorrectly and it was tricking the thermostat into not opening or closing so the car was running hot. I also did have a coolant leak in my hose that was fixed but I took everything off and went to Bmw and they reflashed the car and that did the trick. I am no longer running JB4

Is your water pump loud? Can you hear it over the fuel injectors? This is the sound I’m dealing with. Any help would be nice. https://youtube.com/shorts/IsGqe82j8cA?feature=share