Coolant mystery

[tanpak03]

Hey gang,

I have a 99 4.0l manual. I've replaced every coolant hose and clamp, and the thermostat and it's housing. Getting wicked belt squeak and coolant is leaving the reservoir, but I can't find a drop of coolant under the car or on the belt. Zero temp issue while running. Just drive 9 hours straight. Any thoughts?

 

[RMETeeJay]

Any coolant coming out of the AC drain? Vents smell like coolant?

If no, pressure test system and check coolant for exhaust gases.

 

[macleanflood]

Did a head gasket on an 04 WJ 4.0. Low on coolant and overheated. Head gasket. There was a nice tear in the heater hoses just where you couldn't see.

-Mac

 

[tanpak03]

I'm going to pressure test. No a/c in mine. I do smell coolant from the hood once it's hot. I noticed some fluid across the top of the radiator, the tabs or whatnot.

 

[macleanflood]

Did you use the original OEM style constant tension clamps?

-Mac

 

[Pantera99]

Hey gang,

I have a 99 4.0l manual. I've replaced every coolant hose and clamp, and the thermostat and it's housing. Getting wicked belt squeak and coolant is leaving the reservoir, but I can't find a drop of coolant under the car or on the belt. Zero temp issue while running. Just drive 9 hours straight. Any thoughts?

Yea my '01 has a slow leak somewhere that I can't seem to find. I top off the reservoir every month or so. I just stopped worrying about it.

 

[Jerry Bransford]

Hey gang,

I have a 99 4.0l manual. I've replaced every coolant hose and clamp, and the thermostat and it's housing. Getting wicked belt squeak and coolant is leaving the reservoir, but I can't find a drop of coolant under the car or on the belt. Zero temp issue while running. Just drive 9 hours straight. Any thoughts?

Sounds like a blown head gasket to me.

 

[JKP]

I'm going to pressure test. No a/c in mine. I do smell coolant from the hood once it's hot. I noticed some fluid across the top of the radiator, the tabs or whatnot.

Sounds like your rad is leaking at the O ring or it's got a crack.

 

[inkedrose]

Any coolant coming out of the AC drain? Vents smell like coolant?

If no, pressure test system and check coolant for exhaust gases.

What would that be a sign of?

 

[macleanflood]

What would that be a sign of?

Coolant out of the AC drain or in the passenger footwell, or smelling sweet coolant running the HVAC are all signs of a leaking heater core.

-Mac

 

[inkedrose]

Coolant out of the AC drain or in the passenger footwell, or smelling sweet coolant running the HVAC are all signs of a leaking heater core.

-Mac

gotcha, thanks. Hadn't heard that one yet

 

[Link]

I'm going to pressure test. No a/c in mine. I do smell coolant from the hood once it's hot. I noticed some fluid across the top of the radiator, the tabs or whatnot.

That leads me to suspect the radiator is failing.

 

[B1Toad]

I was losing little bits and it was annoying b/c I have a new cyl head, new radiator, water pump and hoses and I am watching it close. With the GO-5 if your engine bay is clean you can see telltale signs of dried white residue and I cleaned everything up spotless but white residue kept appearing on the top tank and on the fan and pulley hub. Finally changed all the worm clamps to constant tension about 2 weeks ago and so far no coolant missing and no white residue.