BMW E39 M5 - Code 69 - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 02-02-2012, 12:19 PM
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BMW E39 M5 - Code 69

Hello everyone,

I have a question. My SES light came on. So I ran diagnostics it and it came up as Code-69. I replaced the sensor, I used OEM, and reset the SES.

Couple of days later SES came on again. Same Code-69. So I did another reset. Couple of days later same thing.

I ran OBC test-7 and I think my KTEMP is OK. It in mid 70's C and slightly higher when standing for 5 to 10 min. I think it reached up to 82 C. Out side temp was about 45 F. (It is winter in CO..............LOL).

The temp gauge in right in the middle (12 O'clock) when car is fully warm.

Could it be that T-Stat got stock in open position and car is running too cold?

Thanks.
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#2 (permalink) Old 02-02-2012, 12:27 PM
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Tbh, you should try the Stat as I think you're on the right track... Also, disconnecting the battery might help/assist in clearing the fault.

Bear in mind that 90degs is considered as a safe max, or top operating temp before she encroaches the boiling area !!


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#3 (permalink) Old 02-02-2012, 01:04 PM
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I have tried to clear codes using BavAuto SR-300 (Love that little tool). But code keeps coming back.
I never reach 90 C - KTEMP, but it is cold here. I average about 75 to 78 C while driving and a little higher when standing.

My car has a little over 105K mile, so I think it might be time to change T-Stat and change the cooling. Don't want to over-heat during the summer.

I am going to take it to the shop, because I think changing a T-stat is a little above my ability. (Its not like in Toyota's...............LOL).

Thank you very much for the info.
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#4 (permalink) Old 02-02-2012, 01:54 PM
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Noooooooooooo Its easy !!


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#5 (permalink) Old 02-02-2012, 02:04 PM
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Really? I thought it was pretty complicated on German cars.
I'll need to do more research, maybe I'll find step by step DIY instructions. If I find a good link, I'll be sure to post it. Maybe someone else could use too.
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#6 (permalink) Old 02-02-2012, 10:56 PM
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OK. I think I found enough info on how to change T-Stat, so I should be able to do it at home.
And I think I just realize that I replaced the wrong sensor. I think I should have replace "DOUBLE TEMPERATURE SWITCH / Part #13621703993". But I replaced the "Auxiliary Fan Switch / Coolant Temperature sensor / Part #13621433077)

So I am not even sure if I even need new T-Stat, but due to mileage I think I should change it.
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#7 (permalink) Old 02-03-2012, 12:31 PM
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Yeah, there is one sensor on the head for main temp reading and one usually on the rad for the fan(S) !


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#8 (permalink) Old 02-06-2012, 11:07 PM
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What's the best way to bled the cooling system after changing the thermostat. Is there a special tool or a trick to do it?

Thanks.
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#9 (permalink) Old 02-07-2012, 06:07 AM
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What I did, and it seemed to work ok for me (on a cold engine). Fit all your hoses except the top radiator hose on the block. Pour coolant in through the hose until you have coolant appearing in the block outlet. If you can put your car nose up (on ramps is good) it helps to purge the air from the system. Connect the hose to the block outlet, check the expansion tank levels and then start the engine with the heater on max heat. Keep an eye on the level with in your expansion tank, you should see the level falling as air bubbles are purged from the system, once the tank level starts to rise, put the expansion tank cap back on and open the purge valve (if you have one) near the expansion tank. Once you have just coolant being bled out this valve, close the purge valve and go for a drive, keep an eye on the temperature guage and pay attention to whether or not you are getting warm air from your heater vents. Check the expansion tank levels every day or two for a week to 10 days, or until you don't need to top up the expansion tank. Use your normal precautions around hot cooling systems to avoid being scalded.


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#10 (permalink) Old 02-07-2012, 11:28 AM
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Thank you very much for the detailed info.
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#11 (permalink) Old 03-19-2012, 04:13 PM
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Could T-Stat fix itself.....yes, I know its sounds silly......but I am having something rather odd with my M5.
So I changed top Coolant Temperature sensor. Reset the system. Drove for couple of days, SES Light came one, Code 69.
I reset it drive for for couple more days. Again SES Light came one, Code 69.
I did another reset. Couple days later, same thing, Code 69. So I figure T-Stat is done. Ordered new one on line.

Since temps were normal, I continued driving my car. After about 3 days of driving, SES light turned off by itself and has not been back for about 3 days.............Could anyone explain why?and should I still change the T-Stat?
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#12 (permalink) Old 03-21-2012, 04:28 PM
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Change it anyway, if only for peace of mind !!
It will build your confidence with the spanners too


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#13 (permalink) Old 03-21-2012, 11:00 PM
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Well, SES came back on my way home. I have not checked code, but I am 99.9999% sure its code 69. So planning to change T-Stat this coming Sat or Sun. Hopefully won't see SES light again. (I really hate that light..............LOL).
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