coolant loss but no internal leakage

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phil - 03 Nov 2006 17:29 GMT

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.

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Steve Stone - 03 Nov 2006 18:17 GMT

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

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Phil Hurwitz - 03 Nov 2006 19:39 GMT

* Steve Stone:

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

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.

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