The past couple days I have been leaking coolant. The drops are coming off of the oil pan, not the radiator. So my guess is an old hose or something, not a hole in the radiator. How should I go about this? Stop leak, flush, and fill?
look at the top hose of the radiator... Squeeze it hard, see if you can force any coolant out. Check the bottom of the fan pully. You may have blown a water pump. LOL that was my repair 2 weekends ago. while your at it change the thermostat..
Are the drips coming off of the front of the oil pan (toward the bumper) or the rear of the oil pan (transmission side).
Front is probably coming from the weep hole on the water pump....time for a change.
Rear could the freeze plug in the back of the block, behind the flywheel....changed that guy once....what a pain in the ass! If it is the freeze plug, I would put a can of bars with the granulated copper in it, before dropping the trans, and pulling the flywheel.
The moral of the story is...unless you have a major engine problem...coolant doesn't leak from the oil pan, it leaks down to there from somewhere else.
So I went and squeezed the hoses. When I squeezed the big hose that goes into where the thermostat lives, I heard fluid move, and looked under and saw drips on the ground. That was the only hose that made noises or dripped fluid.
My guess is a new gasket for the thermostat. But I know very little regarding engines.
It would be rare if the thermostat housing gasket just mysteriously went bad. It is a flat surface to flat surface seal. Held in with 2 bolts, very little to go wrong there. Unless the motor was over heated, I would doubt that it was a thermo housing gasket.
As was said above, it is most likely the water pump that is bad, in behind the pulley the water pump has a "weep hole" in it to prevent pressures from building up inside when it spins. It also allows coolant to "weep" out when the internal seals of the water pump go bad. This is the sign it needs replaced.
'87 YJ, 4.2L built and bored, 8.5" of lift, 8.8 rear, AX15/NP 231, Tom Woods drive shafts, Flat fenders, 12,000LB winch, Custom bumpers, Rattle can paint job. Never completed...
Just tossing it out there. There are a few freeze plugs on the head. I recently had one rust out and start weeping toward the front of the block on the drivers side. Consider looking around at the plugs.
Okay folks, so I know my water pump is not working, because the overflow for the coolant is full and the radiator is empty when it runs. The leak is right below where the lower hose meets the engine. Is there a freeze plug, or weep hole there? Or is it the hose? Thanks.
You can remove the pulley and the fan and see the weep hole. My 6 month old water pump was leaking from weep hole and running right down the left edge of the oil pan to block seal. Also FYI the first time I did my water pump I didn't know the air box was a 2 second remove. Take it out it will help get to the PS pump tension bolts.
So today I replaced the water pump and lower radiator hose. Drove less than a mile before it was in the red. Got out and it was steaming user the hood and coming into the cab through the vents. Antifreeze all over inside of the hood and engine bay. I noticed the overflow reservoir was full, and the radiator was empty.
Tried taking out the thermostat, maybe its stuck open. No dice. Overheats even faster. Radiator still not filling from overflow.
I didn't put on the fan shroud but that could not possibly be causing these problems.
I wish mine was that easy. i have been fighting a moving target for roughly 1.5 years now. Started with a simple upper hose leak, replaced all good. sometime later smell more than fluid, started watching. seem to find liquid under thermostat housing. nothing big let it go for a little. one day heat quit running as hot as leg burning jeeps can so it was time to replace thermostat and gasket. all good for a while. still getting smell, still seeing fluid under housing. Bought new housing thermostat and gasket just to be ready. sure enough visible crack in housing, replaced all good for 1 month. yesterday i drove from work to home (30 minutes) and when i parked coolant pouring out from front pan gasket area. i am going to have to replace pump and I think while at it both hoses and serpentine belt (she did turn 8 this year). Hope this fixes my problem and doesn't move it to a freeze plug.
one note is when i changed first hose oh so long ago i found orange dex-cool in the system. No ill will to dexcool but i prefer green and flushed and replaced. possible that this has been the issue all along and just chasing the pressure from weakest spot to the next.
Hopefully its not freeze plugs. Word is they are easy to change. Just a bishh to get too. I ended up replacing lower hose, water pump, thermo-houring, thermostat, and soon will be the upper hose and e-fan. Figured if I replaced half of it, might as well replace the rest, right?
Every time I get a new used vehicle, one of the first orders of business is to strip the cooling system and replace everything. That way, I don't have to worry about it any more. Ive had to replace just about every jeep thermostat housing due to corrosion causing leaks.
Yes, the coolant pressure tester is a great tool. I use it before and after.
'91 YJ Sahara 4.0L/AX-15/NP231, D30/D35 @3.07
'12 KK Cherokee 3.7L/42RLE/MP1522, D30M/8.25 @3.73
"Non vi sed, Arte"