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  Topic Review (Newest First)
05-05-2017 03:10 PM
Jerry Bransford
Quote:
Originally Posted by Worshiper View Post
update...it was th heater core. I bypassed it and the smell was gone so i bit the bullet and just replaced the heater and evaporator core. I was told the coolant was very acidic so I guess it wasn't changed in a while. Any suggestions as to what fluids I should be replacing prophylactically on this jeep? 2004 new to me. brake fluid maybe? the brakes do feel a bit spongey
DOT 3/4 brake fluid is what you want, avoid DOT 5 which is incompatible. Synthetic brake fluid is best. Zerex G-05 is a great choice of coolant, make sure to only dilute it to 50:50 with distilled water, don't use tap water.
05-05-2017 03:06 PM
MoFarmBoy
Quote:
Originally Posted by Worshiper View Post
Any suggestions as to what fluids I should be replacing prophylactically on this jeep?
Were it me, I'd swap out all fluids, especially since the dealer's word is suspect.
Engine oil and filter
Differentials (F/R)
Tranny (if manual)
Transfer case
Brake fluid
Read up on which fluids will suffice, especially your tranny.
05-05-2017 12:35 PM
JEK3
Quote:
Originally Posted by Worshiper View Post
update...it was th heater core. I bypassed it and the smell was gone so i bit the bullet and just replaced the heater and evaporator core. I was told the coolant was very acidic so I guess it wasn't changed in a while. Any suggestions as to what fluids I should be replacing prophylactically on this jeep? 2004 new to me. brake fluid maybe? the brakes do feel a bit spongey
Brake fluid should be flushed/replaced periodically. If you don't know when it was done last, then it's probably time to do it.
05-05-2017 12:23 PM
Worshiper update...it was th heater core. I bypassed it and the smell was gone so i bit the bullet and just replaced the heater and evaporator core. I was told the coolant was very acidic so I guess it wasn't changed in a while. Any suggestions as to what fluids I should be replacing prophylactically on this jeep? 2004 new to me. brake fluid maybe? the brakes do feel a bit spongey
05-01-2017 09:56 AM
TJ4Jim
Quote:
Originally Posted by Worshiper View Post
So would I be correct in assuming that if there was something wrong with the heater core I should smell coolant or fog up the windows even when the heat is off?
If the core is leaking then yes, the coolant thru the heater core is constant.
05-01-2017 06:50 AM
JStMarie
Quote:
He thought he saw a leak on the passenger side of the lower part of the radiator because there was a small puddle there and he put what looks like kitty litter into the radiator and said it may fix it.
You can't pass a pressure test with a leak large enough to cause a "puddle". Sounds like the dealership either screwed up the test or worse they simply lied. In my experience having an independent mechanic look at any potential issues is better than letting the dealership who is trying to sell you the car do the diagnosis or inspection.

Throwing stop leak junk at the problem is at best a temporary solution and at worst known to gunk up your coolant system in very undesirable ways. I would eliminate this mechanic from the list of folks to which I bring my vehicles. I'd also recommend you not let anyone put things that look like kitty litter or anything that doesn't look like coolant into your coolant system.
04-30-2017 03:54 PM
hotvak123 you might have a hose clamp seeping on the heater core as it cools off, try plugging the heater core off to check for the smell. other wise just deal with it till it gets worse.
try laying cardboard under the jeep over night see if you get drips.
04-30-2017 02:14 PM
JEK3
Quote:
Originally Posted by Worshiper View Post
So would I be correct in assuming that if there was something wrong with the heater core I should smell coolant or fog up the windows even when the heat is off?
Not necessarily. When the heat is off, the blend door is blocking airflow through the core. No airflow means you may not have the smell brought up to your nose, or it is so diluted by the fresh air bypassing the core that you don't notice it. Similar for the fogging.
04-30-2017 11:57 AM
Worshiper ok so update... I brought is to my radiator guy and had him take a look. He thought he saw a leak on the passenger side of the lower part of the radiator because there was a small puddle there and he put what looks like kitty litter into the radiator and said it may fix it. It did not. I still smell coolant but I don't see that wet spot on the radiator anymore... the plot thickens.
04-30-2017 11:55 AM
Worshiper
Quote:
Originally Posted by Jerry Bransford View Post
X2. It is normal for pure water (condensation from the a/c system) to drip out of that tube but coolant should not be in the water.
yeah it is definitely draining water. But should this be draining even if the AC is not on?
04-30-2017 11:54 AM
Worshiper
Quote:
Originally Posted by Jerry Bransford View Post
There is no hot water control valve in a Wrangler TJ. Hot engine coolant flows through the heater core 100% of the time whether the heater is running or if you have the A/C on.
So would I be correct in assuming that if there was something wrong with the heater core I should smell coolant or fog up the windows even when the heat is off?
04-28-2017 04:53 AM
JEK3 Something like this: https://shop.advanceautoparts.com/p/...75cs/7010041-P may help you find a leak.
04-27-2017 06:44 PM
Jerry Bransford
Quote:
Originally Posted by TJ4Jim View Post
Keep a close eye on the condensate drain tube rather than looking for coolant on the passenger floor, if the core is leaking it should show up there.
X2. It is normal for pure water (condensation from the a/c system) to drip out of that tube but coolant should not be in the water.
04-27-2017 06:21 PM
TJ4Jim
Quote:
Originally Posted by Worshiper View Post
Yeah I know. Me too originally which is why I was freaking out a bit but theres no fluid in the passenger cab at all and the fogging is only for a split second and no when the heat is running and the defroster is not. So im not really convinced.
Keep a close eye on the condensate drain tube rather than looking for coolant on the passenger floor, if the core is leaking it should show up there.
04-27-2017 11:14 AM
NotURMailman
Quote:
Originally Posted by Jerry Bransford View Post
There is no hot water control valve in a Wrangler TJ. Hot engine coolant flows through the heater core 100% of the time whether the heater is running or if you have the A/C on.
DOH!

I must be mixing up my TJs, XJs, and MJs again...

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