Thermostat opening temp 105c? - E46Fanatics E46 BMW Social Directory E46 FAQ 3-Series Discussion Forums BMW Photo Gallery BMW 3-Series Technical Information E46 Fanatics - The Ultimate BMW Resource BMW Vendors General E46 Forum The Tire Rack's Tire Wheel Forum Forced Induction Forum The Off-Topic The E46 BMW Showroom For Sale, For Trade or Wanting to Buy

Go Back   E46Fanatics > E46 BMW > General E46 Forum

General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 08-14-2019, 07:35 AM   #1
Chrisbish2000
Registered User
 
Join Date: Aug 2019
Posts: 14
Thermostat opening temp 105c?

2000
318ci
M43tu engine

I replaced the thermostat recently with a Topran. Apparently all thermostats for this engine (PN 11531437085) state that they open at 105c, that seems very hot to me.

I replaced the water pump and thermostat. While flushing I used the digital dash temp gauge to keep an accurate eye on engine temp. Needle temp gauge stayed in the middle the whole time but the engine went up to 115c after 15 minutes of fast idle which I feel is hot, most thermostats should open at 85ish no? At 115c the bottom hose felt only slightly warm and nowhere near a hot as the radiator top hose.

Engine seemed ok but I think there was air in there after draining the old coolant and filling up with the flush, I bled it but no hot air was blowing though the heater.

Does anybody know about the specs on this engine and what's considered "normal" I know they run hot but is that normal? Thanks.

Last edited by Chrisbish2000; 08-14-2019 at 07:36 AM.
Chrisbish2000 is offline   Reply With Quote
Old 08-14-2019, 11:58 PM   #2
darkfires102
Registered User
 
Join Date: Mar 2019
Location: Colorado, USA
Posts: 373
My Ride: 325xi, '07 E60 M5
Year: 2003
Transmission: 5spd Manual
Sounds like air in the system. Not sure on M43 engines but M54 cars normally run between 95-105 C.
darkfires102 is offline   Reply With Quote
Old 08-15-2019, 12:17 AM   #3
Sapote
Registered User
 
Join Date: Jan 2008
Location: southern California
Posts: 2,622
My Ride: 2000 323i auto wagon
Radiator should feel hot and if not then Tstat didn't open.
Sapote is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 08-15-2019, 04:08 AM   #4
Antti
Registered User
 
Join Date: Sep 2013
Location: Finland, Europe
Posts: 1,107
My Ride: 330CI / 316 1.8i
Year: 2005
Model: 330CI M-Sport II
Transmission: Automatic
If car runs fine and temp needle stays 12 o clock, dont worry too much.
Temp should go little bit down when thermostat opens. Just be sure car is blowing hot all the time inside cabin and temp needle stays 12.
I have 316i with N46 engine (valvetronic 4 cylinder), and if i remember correct it runs much hotter compared my M54B30.
__________________
BMW E46 330CI M-Sport II 2005 Individual Black Sapphire metallic /Showroom https://forum.e46fanatics.com/showthread.php?t=1241411
BMW E46 316 1.8i Sport 2005 Mysticblau metallic /Showroom https://forum.e46fanatics.com/showthread.php?t=1130549
Renault Clio RS197 2007 Ultra Red
Antti is offline   Reply With Quote
Old 08-15-2019, 04:14 AM   #5
BaliDawg
DEADBEEF BAADF00D
 
BaliDawg's Avatar
 
Join Date: Aug 2012
Location: Riverside, CA
Posts: 8,486
My Ride: E39 E46 E84
Check the water pump. If coolant is hot but heater and radiator are not, there may be a coolant flow problem.
Also, is the electric fan operating properly?
__________________
BaliDawg is offline   Reply With Quote
Old 08-15-2019, 08:02 AM   #6
Chrisbish2000
Registered User
 
Join Date: Aug 2019
Posts: 14
Water pump is new. The fan didn't come on which is another issue.
Chrisbish2000 is offline   Reply With Quote
Old 08-15-2019, 08:07 AM   #7
markusmarkus
Registered User
 
Join Date: Jul 2008
Location: USA
Posts: 8,997
My Ride: 2018 M240i
The installation of aftermarket cooling system parts is strictly verboten. 105*C is too high.
markusmarkus is offline   Reply With Quote
Old 08-15-2019, 08:28 AM   #8
Chrisbish2000
Registered User
 
Join Date: Aug 2019
Posts: 14
If you follow the link below they are all rated to open at 105C, even the Mahle which I though was considered good to use in these cars. Every manufacturer wouldn't use the same rating unless specified by BNW for this engine surely?

https://m.autodoc.co.uk/car-parts/oe...caAs1DEALw_wcB
Chrisbish2000 is offline   Reply With Quote
Old 08-15-2019, 08:35 AM   #9
E46Wagoneer
Registered User
 
Join Date: Aug 2019
Posts: 5
I recently picked up a E46 Wagon with an over heating issue that has since been fixed (torn lower radiator hose).

Living in the southwest, I have been monitoring temps on the regular utilizing the Torque Pro app and have seen as high as 221F (105c) on a handful of occasions. Current ambient temperatures this week are 110-115F degrees. From my research, the thermostat is a 207F (97c), so should hover around that area majority of the time. When driving my car, anything light throttle or idling is staying around the 205f area, with creeping upwards of 221f when accelerating, such as getting up speed on the on ramp of a freeway. Majority of cruising appears to hover from 205-210f area. Mind you all of this is with AC running full blast. Both of my fans are functional and no known issues with the cooling system. Freshly flushed with BMW blue 50/50 mix.

That said, I don't think that 221F (105c) is any concern as my other vehicles (Audi and a sports bike) both have thermostats that open at 221F and have no issues even with these excessive ambient temps.

Last edited by E46Wagoneer; 08-15-2019 at 08:44 AM.
E46Wagoneer is offline   Reply With Quote
Old 08-15-2019, 08:39 AM   #10
MJC12
Registered User
 
Join Date: Apr 2015
Location: New Hampshire
Posts: 788
My Ride: 2001 330i
Transmission: 5 Speed
Quote:
Originally Posted by Chrisbish2000 View Post
If you follow the link below they are all rated to open at 105C, even the Mahle which I though was considered good to use in these cars. Every manufacturer wouldn't use the same rating unless specified by BNW for this engine surely?

https://m.autodoc.co.uk/car-parts/oe...caAs1DEALw_wcB
According to realoem.com for your vehicle that link is for the correct thermostat part number so I'm thinking that 105C is correct for your car. Granted we still need to figure out why you're getting to 115C.

Have you been getting to 115 at idle or at speed on the highway? If it happens at idle I'd suspect your fan isn't working properly, especially given your note that it wasn't working properly. I believe you can force it to come on with A/C
__________________
2001 BMW 330i
2004 Subaru FXT

Last edited by MJC12; 08-15-2019 at 08:40 AM.
MJC12 is offline   Reply With Quote
Old 08-16-2019, 09:00 AM   #11
Chrisbish2000
Registered User
 
Join Date: Aug 2019
Posts: 14
Yes I think it is correct, I thought I would check if anybody knew exactly.

Thermostat is new, as is the water pump but at 115c the bottom hose should feel as hot as the top no? I took the bottom hose off the Thermostat this morning and water flooded out so it's obviously circulating but still overheating.

115c was at fast idle when flushing the coolant system, not driving. The fan did not come on by itself but if I spin it by hand it starts up for for a while then stops again. I tried unplugging the coolant hose temp sensor but nothing.

Today it won't start. I've got fuel pressure at the rail, spark, air. Car cranks but want start, crank sensor is fine,p. I get an occasional pop noise which sounds like it's coming out the intake if I crank long enough :/. It was running fine the other day, did I over heat it? Maybe it's lost compression.

The issue I'm having is no code reader I own works on this 2000 model. I've heard I need PAsoft v1.4 but I need a windows XP laptop to run it which in 2019 I don't own anymore.

This car is starting to frustrate me.

Last edited by Chrisbish2000; 08-16-2019 at 09:05 AM.
Chrisbish2000 is offline   Reply With Quote
Old 08-16-2019, 08:50 PM   #12
jmo69
Registered User
 
Join Date: Mar 2013
Location: Wisconsin
Posts: 4,786
My Ride: 03 325xi 98 328is
Year: 2003
Model: 325xi
Transmission: Steptronic
Get the OBD Fusion app for your phone and the proper dongle for your phone. It can track your coolant temp among other things and read codes for emissions faults.
__________________
Alternative to expensive xi control arm bushings https://forum.e46fanatics.com/showthread.php?t=1231503

Bad outer xi ball joint? https://forum.e46fanatics.com/showthread.php?t=1127077


2003 325xi auto Stahlgrau

1998328is 5sp
jmo69 is offline   Reply With Quote
Old 08-16-2019, 08:56 PM   #13
Chrisbish2000
Registered User
 
Join Date: Aug 2019
Posts: 14
I've gone with the ipasoft 1.4..It looks the most versatile for coding.

Im at the point now where I need a good code reader for this car. All sorts of strange things are happening.

I'm sure I'll be posting a new thread later in the week after I've had a look at the DME.
Chrisbish2000 is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Censor is ON



All times are GMT -5. The time now is 01:51 PM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
(c) 1999 - VerticalScope Inc. All rights reserved.