RE: after-run timed-ness

[Luis Marques <marques@rtis.ray.com>]

Yes, the 4kq after run relay (separate from the rad. fan relay) does
have a timer buit-in.  It works off a parallel RC (resistor-capacitor)
circuit.  The capacitor is charged off the ignition (terminal 15) and
discharges through a resistor.  When the capacitor is charged, the
temperature switch on the valve cover controls the fan.  After the
capacitor is discharged, the relay quits working regardless of the valve
cover switch.  This prevents the battery from being drained by the
radiator fan.  The ignition needs to be turned on to reset the timer.

Luis Marques
'87 4kcsq

> From: "PAT MARTIN" <MARDKINS@classic.msn.com>
> On the 4kq after run it is almost exactly 9 minutes.  I timed it once.
> Pat