[Author Prev][Author Next][Thread Prev][Thread Next][Author Index][Thread Index]

temperature gauge question

What are possible causes for intermittent operation of the temperature
gauge on an '89 100?  Following the Bentley procedure, I have checked
the resistance of both sensors on the upper cooling hose ( ~3.3k ohms at
50 deg F and ~230-250 ohms when hot) and the voltage on the connecting
harness (4.95V on one terminal and 4.75V on the other).
3.3k ohms is above the spec. in the manual, but the resistance does seem
to change properly versus temperature.  Is there something in the gauge
unit itself (I don't look forward to the idea of dash disassembly) that
typically fails?  It appears aggravated at cold temperature.  Thanks for

Adam Dixon
'89 100  130k