What is inside a Temperature sending unit?
metron9
Posts: 1,100
A friend of mine fixes car guages and also distributes other things like temperature sending units and oil pressure sending units.
He biught about $6,000.00 worth of oil and water sending units and mentioned they were both all over the map when he tested them.
The water temp sending units I tested tonight, one known good one from a euro source and the new batch from the U.S.
I put them on a heater plate and put an ohm meter on each of them, brought the heat up to 215 degrees and mapped the ohms of both.
The new one was indeed way high until it hit about 160 degrees F. Then both of them were the same resistance all the way up to 215.
I watched both of them all the way back down cooling and they were both the same.
Odd thing is, when I initially tested both of the units, I could not get an ohm reading on either of them, open circuit on both at room temp.
During the cooling they went all the way to over 400 ohms, I put ice on them and they went up in the 1000,s
So i wonder why initially i could not get an ohm reading on either of them. What is inside the brass body of the sending unit?
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Think Inside the box first and if that doesn't work..
Re-arrange what's inside the box then...
Think outside the BOX!
He biught about $6,000.00 worth of oil and water sending units and mentioned they were both all over the map when he tested them.
The water temp sending units I tested tonight, one known good one from a euro source and the new batch from the U.S.
I put them on a heater plate and put an ohm meter on each of them, brought the heat up to 215 degrees and mapped the ohms of both.
The new one was indeed way high until it hit about 160 degrees F. Then both of them were the same resistance all the way up to 215.
I watched both of them all the way back down cooling and they were both the same.
Odd thing is, when I initially tested both of the units, I could not get an ohm reading on either of them, open circuit on both at room temp.
During the cooling they went all the way to over 400 ohms, I put ice on them and they went up in the 1000,s
So i wonder why initially i could not get an ohm reading on either of them. What is inside the brass body of the sending unit?
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Think Inside the box first and if that doesn't work..
Re-arrange what's inside the box then...
Think outside the BOX!