YES, Dave if you have an older van ie 85 or so there is a restricting orifice in the in side of the heat exchanger this could easy plug with rust from metal cooling pipes.

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From:  Dave Ohlemacher [SMTP:Dave@OHLEMACHER.COM]
Sent:  Wednesday, January 20, 1999 11:32 AM
To:  vanagon@GERRY.VANAGON.COM
Subject:  Re: Dave's rear heater

Yes, the level is in the "on" position and yes, the fan works.

Is it common to have the rear heater core clog?

Dave

Karl Batzler wrote:

>  Sure Dave,Check to see if the valve on the left side of the rear
> heater is turned on (valve lever towards you I think).  If not, maybe
> a plugged heater core.Karl Batzler84 Vanagon87 Audi 5000 S