Coolant temp sensor?
brett at cloud9.net
Wed Jan 16 21:30:06 PST 2008
On Jan 16, 2008, at 3:41 PM, Phil Rose wrote:
> The coolant warning display flashing on (when
> level and temp are both OK) is a symptom of a
> defective MFTS.
Only if he has the solid-state MFTS. Which may be the only thing in
our cars these days, perhaps? Do they still make the mechanical version?
> Low boost-pressure and inoperative A/C compressor are also symptoms
> of a
> bad MFTS
There are separate switches for the Autocheck and the ECU/climate
control overheat signals. The ECU/CC signal is triggered at a lower
temperature than the autocheck signal, at least in the mechanical
version. Autocheck's alert can be triggered by the MFTS *or* the
coolant tank switch.
> , but the dead temp-gauge is a "dead giveaway".
Not necessarily true, since all three functions are separate devices
inside common body. The temp gauge is driven off a thermistor, and
the two different overheat signals come from different switches pushed
out by a wax expansion device (in the old mechanical ones.)
More information about the 200q20v