[urq] Coolant temp sensor and duty cycle q's

n-engelbert at terrans.net n-engelbert at terrans.net
Mon Dec 1 11:08:19 EST 2003

So what is the appropriate female (?) connector for the round connector
coolant temp sensor?  Is there a crimp on connector for this?

Also, my searches online for the 049 number show a black topped sensor with
round connector as well, and not the flat connector.  ???

Looks like I'm buying the 035...


Nathan Engelbert
83 UrQ 900453

> Nathan,
> I ordered myself a new sensor (035 919 501, OEM 47$, round connector)
> no later than this morning because I found that the one bought last
> summer (049 919 501, jobber, 8$, flat connector) when I did the head
> job is not the correct unit.
> Both are white but 049 is rated at 0-125C and the good one (035) is
> rated at 0-150C. What I found (with the 049) is the ECU _thinks_ the
> engine is hotter than reality and reduce the frequency valve duty cycle
> too soon. So my engine RPM is always a little low when warming up. And,
> most important, the fuel mileage is 3 liter/100 km (4 mpg) worst than
> usual!
> BTW, be very careful when tightening the sensor in the head: that's the
> reason why I had to replace it last summer...  The thing is really
> fragile (10mm brass threads on an hollow tube!! ) and using a 17 mm or
> 19 mm socket with a 1/2 inch ratchet makes a good grip, enough to shear
> it off very easily... Don't ask how I know.
> Live and learn,
> Louis-Alain

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