Check and make sure the cooling system is holding
pressure.  If no leaks the cap may be bad.
                                                        Eric

bob mendonca wrote:

> Our 88 Vanagon runs real good now that we replaced the transmission, but it
> tends to overheat while stuck in traffic or at a long signal light.  The
> temperature gauge goes up considerably.  We have found the only way to get
> the temp down again is to turn on the heater, which causes a lot of
> discomfort during the summer months.  Any ideas on how to correct this
> problem?
>
> Thanks,
>
> Robert Mendonca
> 88 Vanagon
> 85 Vanagon