LS1Aggie09

iTrader: (25)

Howdy! Alright, my buddy and I are getting frustrated as hell. I have a pretty decent amount of coolant leaking from the passenger side of my car somewhere near the firewall it looks like but its NOT the heater core! The coolant is leakin so bad when the heater is on at a rate of about 2-3 drops a second maybe more and causes a puddle pretty quick but doesn't seem to leak when the heater is off.

The water pump and thermostat look great and have 12k miles on them. The hoses and hose clamps look great. The radiator is not leaking anywhere. I am at a loss for what else could be leaking and maybe I am just missing something on this car without having a lot of experience with it.

I did take the throttle body off not long ago (but without disconnecting coolant lines) to clean it out and just bolted it back in. Could i have messed something up there?

Thanks for any input! This is posted in general maintenance section too but yall seem knowledgeable. -Karl

JMBLOWNWS6

iTrader: (17)

Leaking port on the side of the head? Maybe the plug came loose?

daniel6718

iTrader: (36)

i didnt read but why dont you pressure test the radiator and find it?


theres coolant lines on the back on the head on a ls1....

EDS01SS

iTrader: (30)

If its leaking onto the floorboard then it has to be either your heater core or the rubber hoses going to it.Have you done a pressure test yet?

will350wax

iTrader: (21)

Just to clairfy passenger side outside right? Could be the hoses to your heater core. You really cant see the whole hose for a good inspection. Quick way to elimanate that as a possibility is to take both hoses off of your water pump and and just use a small loop of hose. it is two different size hoses so you have to get an adapter. All for less than ten bucks at a part store. My heater core was leaking when I was traveling once and this was my quick solution.

Grimlock

iTrader: (5)

I had a problem like this but it was not the heater core hose. I had a battery leak acid on the radiator return line to the catch can and it ate a tiny hole there (under the battery where you cannot see it but know it's leaking somewhere!). Check that too, that might as well be the culprit.

LS1Aggie09

iTrader: (25)

thanks for the suggestions so far guys. im gonna double check the hoses, but it really seems like its coming from the back of the engine compartment somewhere.

wheres the plug at on the head?

JMBLOWNWS6

iTrader: (17)

LS1Aggie09

iTrader: (25)

thanks...looks easy to get to lol

JMBLOWNWS6

iTrader: (17)

Not in the car unless you have the coil packs off!

khaos288

iTrader: (9)

yeh, karl, lol mine came loose before, its the same hole on the drivers head that has the temp sensor in it

will350wax

iTrader: (21)

Nice Pool Table

JMBLOWNWS6

iTrader: (17)

LOL Random pic off the net for reference But I do have a pool table

Ws6man2000

iTrader: (24)

hey karl how ya been man!!!! I used an old coolant sensor to plug that hole. Because the heads i put on the car with the plug looked like crap and was gonna melt

LS1Aggie09

iTrader: (25)

hey man! its goin great here now....figured out there was a pinhole leak in one of the lines so shes all fixed up now i hope!