QUOTE(Rand @ Sep 20 2021, 06:43 PM)
Yes, you could be wrong (me too), but no way would it be 104. I never even run a CSV and had no trouble in Seattle winters. I was thinking it was under 40, but I've also read freezing. I guess we'll have to wait for someone to quote from a manual.
i'm digging into my manuals a bit now.
like i say i haven't had to go into it in my car.
was something i glanced across a while back doing recommission.
I found this much in my VW L Jetronic manual.
it points to 3 different thermoswitches that could be installed in VWS running L jet.
with three different ranges of operation each with different part #s/
Test chart values.
Thermo-Time Switch
0 280 130 219 (bosch part #s)
0 ohm at 50F infinite ohm at 68F
0 280 130 221
0 ohm at 56F infinite ohm at 74F
0 280 130 214
0 ohm at 86F infinite ohm at 104F
and the parts number for the thermoswitch in 914 parts manual
is
MY 74 before ECO 037 521 = 022 906 163 (vw part numbers)
MY 75 from ECO 037 522 = 043 906 163
and i found in factory manual test check for thermoswitch.
Disconnect plug from cold start valve.
connect text buzzer or ohmmeter between both
both contacts must make connection when temp is below 59 F
when eng temp is above 59 F, buzzer or ohmmeter must indicate an interruption in circuit.
the L jet manual seems to imply the cold start valve operates over a 18 deg range?
in three different types of ranges corresponding to different thermoswitches fitted?
someone who knows a lot more can interpret that test chart data above. and say what it means.
i had some how remembered that 50F lower temp and 104 F upper temp from a couple of years ago but had forgotten it was a total range over three different types of thermoswitch.
would have to do a vw part # to bosch part # search to figure out if the part number listed for 914s corresponds to any/which of bosch part #s from VW L jet workshop manual.
but i think i am right in saying the thermoswitch maybe controls the duration of time the cold start valve opens for and at what temp range?
i reckon mine was working for about 10-20 seconds running the engine on its own when the amb temp here was somewhere between 10 deg C and 15 deg C (50 -59 deg F).
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