The Coolant temperature fan switch is on the thermostat housing on
the driver side of the engine bay. There are 3 sensors hooked there,
the Fuel injection temperature sensor (blue 2 wire), temp gauge
sensor (Red one wire) and a the fan switch (grey 2 wire) which is on
the bottom. You can unplug this while the car is running or the key
is in the on position. When you unplug this sensor it thinks the
temperature went off the charts because of the infinite resistance.
Some times this sensor gets coolant in it from leaking thermostat
housing and it gets confused with resistance settings making the stop
light flash and A/C kicks out. I have moved this sensor to the top
side of the housing with success and no more flashing stop light and
continuous working A/C.
The fans come on low when the A/C is on and come on on low at 190. It
only kicks in at high around 210 degrees or 205 degrees with A/C on.
Hearing the low setting is tough but High is really obvious. It
should never go over 190 if the cooling system is working the way it
is supposed to.
Good luck!
- In peugeot-L@yahoogroups.com, Kenneth Gunnar Ramonet
<gunnarramonet@y...> wrote:
>
> background:
>
> i have a 1991 405 Mi 16 with 135k on the odometer. i drive it
in/around san francisco, ca less that 500 miles/month. like all
previous 405s i've owned, it has been durable and truly trouble free.
>
> the issue
>
> in the last month, it has started to overheat when stuck in
freeway stop and go traffic(temp gauge will shoot up to above 190
which is well before the red zone but still hotter than i'm
comfortable with). ambient temp hasn't become an issue as outside
temps in SF rarely get hotter than 74 F (64 F this time of year).
>
> upon resumption of decent movement, the temp drops quickly to
below 140 (i think). the car is not leaking any coolant and i never
have added fluids (though i'm sure jiffy lube tiops it off, if
required).
>
> this, i think, leaves the electric fan and a possible problem
with it not coming on when required. i've tried to confirm that it
works and perhaps it doesn't because i can't seem to induce kick-in
by turning on the A/C and letting the car idle.
>
> but as i thought about it, i don't think i've EVER heard or seen
the electric fan working on any 405 any peugeot for that matter! and
on the 405 there's two largish ones. they go about their business
pretty quietly compared to, say, a VW fan. and i don't think i've
ever walked away from a peugeot with the engine off and the fan's
still humming away as is common with most 4 cylinder cars (more
commonly in decades past i'm guessing).
>
> can anyone shed some light on this?
>
>
>
>
>
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Received on Wed Dec 14 14:30:13 2005
