  X-ray cluster emission has been observed mainly in clusters with "inactive"
cD galaxies (L_bol ~1E40-1E43erg/sec), which do not show signs of accretion
onto a SMBH. Our recent Chandra discovery of ~100kpc scale diffuse X-ray
emission revealed the presence of an X-ray cluster associated with the radio
loud quasar 3C186 at redshift z=1.1 and suggests interactions between the
quasar and the cluster. In contrast to the majority of X-ray clusters the 3C186
cluster contains a quasar in the center whose radiative power alone exceeds
that which would be needed to quench the cluster cooling. We present the
Chandra X-ray data and new deep radio and optical images of this cluster. The
3C186 quasar is a powerful Compact Steep Spectrum radio source expanding into
the cluster medium. The 2arcsec radio jet is unresolved in the Chandra
observation, but its direction is orthogonal to the elliptical surface
brightness of the cluster. The radio data show the possible presence of old
radio lobes on 10 arcsec scale in the direction of the radio jet. We discuss
the nature of this source in the context of intermittent radio activity and the
interaction of the young expanding radio source with the cluster medium.
