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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 11-25-2008, 08:42 AM   #1
umermariner
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Under-heating...???

Hello,

About a week ago I noticed that the temp. Gauge in my car was not going to 12 O Clock. The gauge would just move 1/4 instead of 1/2. I checked the coolant, and it was really low (I could not see it). So I added more coolant (without any draining procedure). I was expecting it to take a lot more coolant then it took (maybe an air lock).

However, my baby is still under-heating, and the heater is also not working as good, even if I take it for a 20 mile ride.

I am confused. I thought if there is air trapped, it should over heat.

I will appreciate any help.
Thanks.
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Old 11-25-2008, 08:54 AM   #2
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Maybe your gauge is not working properly....
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Old 11-25-2008, 08:56 AM   #3
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Maybe your gauge is not working properly....
I would think that if the climate control works properly. I set it at 91 now, and it still does not push in as hot air as it used to.
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Old 11-25-2008, 06:36 PM   #4
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Check your thermostat!!
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Old 11-26-2008, 04:55 AM   #5
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Thermostats in the E46 are designed to fail in the open positions. It won't light up the SES light on your dash but it will give a code. They aren't too expensive and they aren't hard to replace. Good luck!
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Old 11-26-2008, 05:44 AM   #6
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Thermostats in the E46 are designed to fail in the open positions. It won't light up the SES light on your dash but it will give a code. They aren't too expensive and they aren't hard to replace. Good luck!
So you mean, I should be able to get a code?
Also, what is the best way to confirm Thermostat failure, before actually taking it apart... temperature difference b/w hoses? I tried that this morning.. but was not sure...

Any other way?
Thanks.
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Old 12-03-2008, 03:50 AM   #7
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So you mean, I should be able to get a code?
Also, what is the best way to confirm Thermostat failure, before actually taking it apart... temperature difference b/w hoses? I tried that this morning.. but was not sure...

Any other way?
Thanks.
Yeah, the only way I found out that I had a thermostat failure is when I went to the dealer for my broken transmission and they gave me a code readout. So I bought a new thermostat, installed it, and sure enough, it warmed up a little quicker than normal and my mileage improved slightly.

Obviously though, if you car never gets to the 12 o'clock position than something is wrong. If you recently replaced your thermostat and don't think that is the issue you can have the codes read.
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Old 12-17-2008, 07:56 AM   #8
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Originally Posted by mkodama View Post
Thermostats in the E46 are designed to fail in the open positions. It won't light up the SES light on your dash but it will give a code. They aren't too expensive and they aren't hard to replace. Good luck!
+1 that was the problem with my e46
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Old 12-21-2008, 06:23 PM   #9
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to the OP...

...so I'm curious did you replace the thermostat? did that take care of your problem? mine is doing the exact same thing. i'm gonna try to replace it this week but gotta get a few tools together first. i need the wrench to get the fan off.
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Old 12-21-2008, 10:17 PM   #10
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...so I'm curious did you replace the thermostat? did that take care of your problem? mine is doing the exact same thing. i'm gonna try to replace it this week but gotta get a few tools together first. i need the wrench to get the fan off.
hmmmmmmmm... I got the thermostat (ordered it online), but its really really cold here in NJ now a day, so waiting for the weather to get better . Do I need some special ranch to take it apart :O.... I have all the normal tools though..
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Old 12-22-2008, 07:31 PM   #11
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hmmmmmmmm... I got the thermostat (ordered it online), but its really really cold here in NJ now a day, so waiting for the weather to get better . Do I need some special ranch to take it apart :O.... I have all the normal tools though..
If you have an auto, you'll need a special wrench to remove the fan.
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Old 12-01-2008, 09:31 PM   #12
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If your car has a lot of miles you might want to replace the thermostat anyway. I recently did it and the car heats up much quicker.

I had a code before that said coolant temperature below engine regulating temperature or something like that which means it was running too cold.
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Old 12-02-2008, 09:14 AM   #13
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If your car has a lot of miles you might want to replace the thermostat anyway. I recently did it and the car heats up much quicker.

I had a code before that said coolant temperature below engine regulating temperature or something like that which means it was running too cold.
I ll run the codes too... but I just had it changed around 15000 miles ago
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Old 12-02-2008, 09:28 AM   #14
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im in an 03 m3 and my temp is just a cunt hair under 12 oclock sometimes a little lower within .25" of the "correct" position but it is 20-30 degrees here right now. NORMAL?
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Old 12-03-2008, 08:16 PM   #15
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Have you bled the air out with the heat turned on?
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Old 12-03-2008, 08:45 PM   #16
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Have you bled the air out with the heat turned on?

I tried.. .. i losen the plastic screw just near the radiator oppening.. the heat was at 91, and the fan was at the min.. but still no air bubbles.. i didnt lift the front end though
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Old 12-03-2008, 08:50 PM   #17
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thermostat. replaced mine in 20min, topped up on coolant, and she settles nicely at 12 oclock. gets there fast too.
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Old 12-03-2008, 08:51 PM   #18
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thermostat. replaced mine in 20min, topped up on coolant, and she settles nicely at 12 oclock. gets there fast too.
20 mins :O... didnt you have to take out the fan and stuff?
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Old 12-03-2008, 08:57 PM   #19
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fan comes right out, gotta remove the belly pan too, there will be some coolant drippin
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Old 12-03-2008, 10:08 PM   #20
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fan comes right out, gotta remove the belly pan too, there will be some coolant drippin
hmmm.. u mean.. taking out the fan... and then replacing it will be about 20 mins.. hmm.. thats not bad (even if it is up to an hr.. its ok).

What do u mean by belly pan?
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