Re: Afterrun Radiator Fan on 5ktq

[DeWitt Harrison <de@aztek-eng.com>]

On Tue, 5 Jan 1999 20:24:06 EST, John Katos wrote:

>My 87 5000cs Turbo Quattro would not start this morning. Although it has a
>month old battery, it was -16 degF and the afterrun feature of the radiator
>appears to be wearing down the battery. The effect of the afterrun system may
>be more pronounced due to my lack of the electric water pump. Can anyone help
>by telling me if there is a simple method to temporarily disable the afterrun
>feature of the radiator fan?

The after-run cooling load shouldn't cause a major problem unless it fails to
switch off or unless the charging system is under stress for some other
reason such as poor cold weather starting. I suspect that either the battery
is not being charged properly (have it checked) or some other electrical
consumer is remaining on after the ignition is switched off discharging
your battery overnight. If your charging system proves to be in good
shape, you need to have someone with a current meter track down the
offending circuit by monitoring battery current (engine off) while pulling
fuses one at a time.

DeWitt Harrison
Boulder, CO
88 5kcstq