1. Home
  2. General Ford Forum
  3. coolant loss but no internal leakage

coolant loss but no internal leakage

I have a 97 crown vic. 4.6l

3 mos ago, the intake manifold was replaced--old one split

about month and 1/2 ago, I notice that the coolant expansion tank was dry. I have been adding coolant ever since.

I pressure checked the system. the needle holds steady.

No external leakage of coolant noted. water pump was replaced about 5 mos. ago.

notice from time to time, that the heater will blow cold. the temp gauge will climb, then fall back down--heat then felt coming from vents. still happens even after replacing thermostat.

I'm stumped. If the head gasket were failing, or if I had a crack in the block, then I would have seen a loss of pressure when I pressure checked the cooling system.

Reply to
phil
Loading thread data ...

Is your heater core ok ? How about the hose under the manifold that connects to the water pump ?

Reply to
Steve Stone
  • Steve Stone:

As far as i can tell the core is ok. no sight or smell of leakage inside the car. Hose under the manifold that connects to teh water pump? When I replaced the pump, I do not recall any hoses connecting the manifold to the water pump.

Reply to
Phil Hurwitz

MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.