Dillon Pyron wrote:
> Thus spake Tegger <invalid@invalid.inv> :
>
>> Dillon Pyron <invaliddmpyron@austin.rr.com> wrote in
>> news:rg06955tfkifh0drd6h8vq3fl1hr0ugs66@4ax.com:
>>
>>> Does the compressor put much of a load on the engine at startup?
>>> Lately I've taken to turning the A/C off after I shutdown the engine
>>> and giving it a couple of seconds of run time before I turn the A/C
>>> back on. Am I being silly? If it only saves a couple of percent, yes
>>> I am.
>>
>>
>> The compressor clutch will not engage until the engine is running, so the
>> position of the A/C switch makes no difference on startup.
>>
>> You're better to turn the A/C off a couple of miles from home, not right at
>> shutoff. Allowing the evaporator a few minutes to come to ambient
>> temperature (with the blower fan remaining on) will help dry up the
>> condensation that eventually leads to that "stinky socks" smell.
>
> Thanks. More for the stinky socks advice. I HATE that with a
> passion.
>
> And if you have a turbo, make sure it idles for at least 30 seconds,
> unless you have some sort of additional pressure oiling system.

pressure isn't the issue with a turbo, it's "heat soak". heat from the
turbine conducts back to the shaft and the bearings after it's switched
off and cooks the oil in it. allowing the turbine to cool by idling
[some trucks used to spec three minutes] before switch off mitigates
this. using an oil that can take the heat [synthetics] is strongly
recommended.