Miguel:

Your comment about the heater going cold before the engine overheats sounds
to me like there is air in the system.  That has happened to me before.  A
leak may be losing coolant, or somehow air is getting into your system.

Matt

-----Original Message-----
From: miguel pacheco
Subject: Re: rear heater ETC

...With the heater running, I know it's about to overheat when the blowing
heat suddenly becomes cold...