e30 318is, temp sensor

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lhd220turbo
E30 Zone Newbie
E30 Zone Newbie
Posts: 226
Joined: Fri Jul 06, 2012 11:00 pm

Post Mon Jan 07, 2013 8:23 pm

Gents;

i believe the coolant temp sensor in the 318is is fecked, just want to be sure before i order a new one.

can i test it using a decent multimeter by measuring resistance? if so whats the tollerances?

cheers
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Brianmoooore
E30 Zone Team Member
E30 Zone Team Member
Posts: 49360
Joined: Mon Jan 10, 2005 11:00 pm

Post Mon Jan 07, 2013 11:47 pm

Cold temperature is anywhere between 3000 and 4000 ohms, depending on the time of year/country/weather. Should be around 300 ohms at engine working temperature.
Even if it's right at the extremes, there's still the possibility that it might not 'track' right at temperatures in between - a fact that once allowed me to buy an E30 several years ago for much less than I should have paid.
A little searching on the web should find the full temp/resistance graph.