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  #1  
Old 09-11-2021, 05:14 PM
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M54 -- Map Cooling - Resistance of heater?

So recently, I got the temperature map cooling open/short fault on my e53. I only recently replaced the thermostat a little over a year ago. Upon inspection, I did see the connector had some slight greenish tint on the pin... UGH!

I cannot find ANYWHERE listing what the heater element resistance is suppose to be. When probing mine, I'm getting about 5.1 ohms at about 70F ambient temperature.

Does anyone know what nominal resistance readings of the thermostat heater is suppose to be??
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  #2  
Old 09-11-2021, 07:08 PM
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About 16 ohms
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Old 09-11-2021, 08:30 PM
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Quote:
Originally Posted by 80stech View Post
About 16 ohms
Thank you for responding. Hmm...16 ohms?

Is that posted anywhere on the bentley manual or something? To my understanding, the heater can unclip out I think.
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Old 09-11-2021, 09:16 PM
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I measured the 2 that I have.
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Old 09-13-2021, 08:10 PM
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Well...shoot. Such a stupid thing to replace a whole thermostat with.
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Old 09-13-2021, 09:02 PM
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Yes. it's likely the corrosion migrated out from the coil which is shorting from it.
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Old 09-13-2021, 09:39 PM
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Just wondering what brand is this tstat?

PS: I use only Wahler...
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Old 09-14-2021, 12:45 AM
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The brand of tstat was a STANT. But it was a rebranded/rebadged brand that was marked "made in germany" on it.
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