Jeep Wrangler Forum  Jeep Wrangler Forum ( -   TJ Tech Forum ( -
  -   Water leak behind engine block (  jconway 04-14-2010 11:06
PM  Water leak behind engine block re my 02 wrangler x, 6-cyl,
5-speed: i've got a water leak coming from somewhere behind the
engine block, sort of on the passenger side. The engine does not
run hot, and the oil is pure (no froth, evidence of water.) The
water seems to be leaking just between engine and firewall but I
can't see a leaking hose. any idea what's back there? AND could
it be related to why the heater seems to run cold at idle speed,
but warms up when revved or driving?  JeepersdoitDeeper
04-14-2010 11:16 PM  I was thinking freeze plug until you
mentioned the heater issue, which pushes me more to think heater
core. Some models have a seep hole at the lower part of the
firewall on the pass side to drain off.  If it's not the heater
core, you're possibly leaking from the freeze plug on the back
of the head, which is sort of a bitch, but is repairable.
Requires dropping t