coolant loss but no internal leakage

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

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.

Reply to this Message

F.H. - 04 Nov 2006 18:18 GMT

> I have a 97 crown vic. 4.6l
>
[quoted text clipped - 15 lines]
> the block, then I would have seen a loss of pressure when I pressure
> checked the cooling system.

I'll be following this thread closely. (don't look too promising) I've
had the exact situation with my 97 4.6 Bird. Seems its always been
that way but it might have started after factory replacement of original
manifold. I lean towards always. Seems like I've always needed to add
water and never known why. The "climb" and "fall" stopped happening a
couple years back, not sure why. Runs like a dream otherwise. Fixing
to change the manifold (again) and while I'm at it pretty much
everything else in the cooling system. New manifold right here in the
box, just gotta get off my butt and do it.

Reply to this Message