97 Blazer Mystery leak

[hippychick_67]

Antifreeze leaking from front of motor somewhere seems to only leak when I run the heater, Please Help!!

[Alexxn 00 Si]

Try checking where the intake manifold bolts onto the heads at the front of the engine.....the seam right between the 4 front intake bolts...mine was leaking there and ran to the back of the engine but it could also leak to the front....I had my intake gasket replaced.

[hippychick_67]

Thank you very much, will check into that, I also heard it might be my water pump???

[aleekat]

I had to replace the same gasket, but if it only does it when running the heater. Pop the hood, look against the firewall for 2 hoses about 1" around that run to the heater core. Follow them back towards the water pump. Maybe just the clamp needs replacing/tightening.

[Gooseneck]

I agree with Aleekat, if it only leaks when heater is on than it is leaking somewhere from the coolant return from the heater core. coolant circulation is shut-off at this point when heater is off.