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General E46 Forum
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Old Yesterday, 04:36 PM   #1
patdown
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Join Date: Dec 2008
Location: Canyon Lake, Texas
Posts: 80
My Ride: 2005 BMW 330Ci
Do I have T-stat problem?

I have an Ultraguage set to get water temp in F degrees. Usually when I drive at 75 mph, the temps are around 208-210F. Changing speeds does not seem to affect the temp.

Today, the air temp on the cluster was 103F. I drove for about 45 minutes and the UG temp was in the 208-210F range. I stopped for about 20 minutes for some errands and then got back on the highway at 75 or so mph. I noticed that the UG temp was now showing 199.4F. Stayed this way until I started slowing down to 40-50mph. The UG temp varied from 190 to 197F. Finally got into my neighbor which has some fairly steep hills. The UG temp jumped up 204-206F as I started putting a load on the engine (20-40 mph) as I went up and down several hills until I got home.

I noticed the same thing last week. Happened about the same way. Outside temps were over 100F. When outside temps are in the mid 90's and below, I stay in the 208-210F range all the time, no matter if I speed up, slow down, or go up or down hills.

I have previously had a P0597 Thermostat Heater Control Circuit Open code. That has always happened when the weather was cool. Never has happened in the summer. Happened this past winter two or three times. Cleared the code each time. I replaced the t-stat in 2009 @ 72K miles and now I have 123K miles. I started picking up this P0597 code in November 2011 and have gotten every winter since then.

Any of you guru's have any ideas on this? I can't remember in past times of hot weather if this same scenario happened.
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2005 330Ci ZHP 6MT
AA Tune, domestically engineered CAI w/aFe Pro S, UUC TSE3,
Cooling Sys ovhl with Stewart WP, BMW M3 Front Strut Brace,
Koni FSD struts/shocks with original springs,
Cryo-Stop Rotors, Akebono Euro Ceramic pads, SS Brake/Clutch lines, CDV Delete,
Mason Engineering clutch pedal, Umnitza Predator Orion AE's, smoked corners and sides,
VMR V710 18" Staggered w/Hankook Ventus V12 235's/FR and 265's/RR
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Old Yesterday, 04:43 PM   #2
HLG600
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Join Date: Jan 2008
Location: NNJ
Posts: 1,668
My Ride: German
190F (or 88C) is the at the very low end of an acceptable operating temperature range. Soft failing units cause operating temps to dip a good deal lower than that.

I think your thermostat is fine, but it wouldn't hurt to keep monitoring it. Check out the temp gauge link in my sig. A few clever members outlined a way to code out the idiotic buffer that comes from the factory.

Unrelated note, but I love my Ultragauge. Very handy.
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Old Yesterday, 04:48 PM   #3
patdown
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Join Date: Dec 2008
Location: Canyon Lake, Texas
Posts: 80
My Ride: 2005 BMW 330Ci
It was only at the 190F for a couple of minutes. During this particular 40-50 mph event, it was mostly in the range of 194 to 197F until I got into my neighbor.
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Pat

2005 330Ci ZHP 6MT
AA Tune, domestically engineered CAI w/aFe Pro S, UUC TSE3,
Cooling Sys ovhl with Stewart WP, BMW M3 Front Strut Brace,
Koni FSD struts/shocks with original springs,
Cryo-Stop Rotors, Akebono Euro Ceramic pads, SS Brake/Clutch lines, CDV Delete,
Mason Engineering clutch pedal, Umnitza Predator Orion AE's, smoked corners and sides,
VMR V710 18" Staggered w/Hankook Ventus V12 235's/FR and 265's/RR
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Old Yesterday, 05:07 PM   #4
AWDBMW
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Join Date: Feb 2009
Location: Denver
Posts: 98
My Ride: 04 330CI
Your thermostat is 5 years old with close to 50K on it and you've been getting thermostat related error codes for 3 or 4 years? Change it, it's only $50 to $60 bucks.
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Old Yesterday, 05:52 PM   #5
jfoj
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Join Date: Nov 2009
Location: Fairfax, VA USA
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My Ride: '06 330CiC, '03 M5
96C idling is what these engine should operate at. The problem is once the outside ambient is above 70F even a soft stat may reach close to 96C. Just wait and see what happens once the ambients drop below 70F!

You need to use a garden hose to super cool the radiator and see if the engine can stabilize the temp, likely it will not.

After 2 years the main spring on the stat gets weak and they typically go soft.

Change the thermostat now while the weather is good, otherwise you be out in the cold getting wet with antifreeze and using very choice words this Fall or Winter!

See the 3rd link below in my signature for more info.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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Old Yesterday, 07:37 PM   #6
sneakyRedPanda
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Join Date: Dec 2013
Location: Santa Rosa, CA
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Yeah, mine failed open and I was getting as low as 50-60C temperature readings. 96C as jfoj said is the normal operating temp.

Replace it.
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Old Yesterday, 08:17 PM   #7
AWDBMW
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My Ride: 04 330CI
I noticed in your signature that you had a cooling system overhaul including a Stewart water pump. I've heard these pumps have a higher rated flow rate than the OEM versions. If your thermostat is beginning to soft fail open this would tend to reduce the coolant temp even more by increasing the flow to the radiator at a given thermostat opening. Any particular reason why you chose a Stewart over a Saleri or other OEM equivalent?
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