Engine rear passenger side blower fan.

[Frodo]

Related question: When I've been driving my Box ('01S) for awhile, I've noticed that often times if I come to a stop the engine bay exhaust fan is not on. I'll shut the car down, run into the store (or whatever), come back a few minutes later and restart the car. At that point, the fan comes on.

Is this normal? I.e., if it's hot enough for the fan to kick in after I restart the car, wouldn't it surely have been that hot when I rolled to a stop??

[Lil bastard]

Originally Posted by Frodo

Related question: When I've been driving my Box ('01S) for awhile, I've noticed that often times if I come to a stop the engine bay exhaust fan is not on. I'll shut the car down, run into the store (or whatever), come back a few minutes later and restart the car. At that point, the fan comes on.

Is this normal? I.e., if it's hot enough for the fan to kick in after I restart the car, wouldn't it surely have been that hot when I rolled to a stop??

Not really. When the car is in motion, air flowing along the underside is picked up by the two diverters and directed through the engine bay and out the pass side vent maintaining a cooler temp.

But, once you stop the car (and the airflow), the engine bay temp increases beyond the threshold determined by the DME and the fan acitivates.

Another issue with these fans is the relay (#8 in the trunk relay panel). If the relay is intermittent, this too can cause an issue.

[pk2]

2x

Another contributing factor, the block no longer has water coursing through it so instead of heat being carried away and dissipating through the rads, it dissipates through the block and into the engine compartment.

Regards, pk

[Frodo]

Now why didn't I think of that??