Don't have a real good idea here, but maybe a clogged Cat or a bad
ignition coil...both will occur on an '89 405
> Now, here's the second thing I've noticed: occasionally (and
>for no good reason), you'll hear a relay buzzing behind the dash. It
starts off
>as a barely-audible series of clicks then graduates to a
>piezo-electric-type constant buzz, by which time the 'STOP' light on the
dash is
>illuminated. The only cure for this one is to go home and not touch the
car until
>the next day.
When my STOP light comes one It is often accompanied by the clicking you
describe
figure out why the STOP light is coming on.
You need to learn to diagnose the check engine light using a $2 switch
and 6 feet of wire.
email my off-line and I'll send instructions.
What's odd about all of this is that a) I didn't have the
>air-con on at the time (the fan was, though),
and b) that the fan seems to have a >mind of
>its own: you can't select the highest speed with the dial - you'll
>actually get a speed that's about two notches down from that. However,
on
>occasion and for no good reason, it'll start blowing at top speed......
heater blower failure is pretty common on these cars. the blower comes
out as one piece behind the glove box. The circuitry attached to the fan
blower is probably shot.
Find a replacement in a junk yard if you can. BTW, the blowers are all
date stamped on the housing, and I think many were replaced under
warranty by dealers I pulled one out of a junked 405, and the blower was
made in late 1990, while the car was an '89
>turn the fan or car off, at which point you're back to square one.
>One other thing (well, two, actually): even with the heater up
>full, I get no heat whatsoever - what's coming through the vents is only
slightly
>warmer than the ambient temperature. Also, the dial that selects where
the
>air should be directed sticks (usually between positions), and can be a
>real bugger to get working again. Is it possible that an archon wire is
>getting jammed in there and shorting out?
>
You may be having the climate control ECU/blend door motor problems which
are common to the 405's. It also sound like you have a disconnected
linkage behind the temp and vent dials...I might look there.
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