Help finding coolant leak?
05-21-2017, 05:21 PM
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1995 Mercedes C36 AMG
Help finding coolant leak?
Let me share my current '95 C36 issue and see if anyone can help:
In the past month, I've been loosing a lot of antifreeze. Temps, oil and all indications are fine. Cooling system cycles on/off with heater on as expected. I replaced head casket, fan clutch, bearing, pulley; pulley tensioner and all coolant hoses a couple of years back. I know my AC unit is bad and will replace later this year.
From underneath, the coolant is dripping off center of oil pan from down middle of engine block beneath manifold. No fluids present up front on radiator or hoses direct to the radiator. Not particularly damp around fan/fan clutch. And no signs of fluids near back of engine or firewall.
I'm not familiar with where all the coolant goes through hoses under manifold and searching for diagrams/ideas?
EDIT: I ran the car with the heat on high. This dramatically increased the flow rate dripping off the bottom of the oil plan in center, driver's side. Cannot see excessive leak for any source, joint, unit? I am thinking Water Pump. I reviewed records and it was replaced in '06. I will probably go ahead and order water pump and a/c compressor unless a better idea for diagnosis pops up here. Any thoughts on where to buy?
Thanks!
In the past month, I've been loosing a lot of antifreeze. Temps, oil and all indications are fine. Cooling system cycles on/off with heater on as expected. I replaced head casket, fan clutch, bearing, pulley; pulley tensioner and all coolant hoses a couple of years back. I know my AC unit is bad and will replace later this year.
From underneath, the coolant is dripping off center of oil pan from down middle of engine block beneath manifold. No fluids present up front on radiator or hoses direct to the radiator. Not particularly damp around fan/fan clutch. And no signs of fluids near back of engine or firewall.
I'm not familiar with where all the coolant goes through hoses under manifold and searching for diagrams/ideas?
EDIT: I ran the car with the heat on high. This dramatically increased the flow rate dripping off the bottom of the oil plan in center, driver's side. Cannot see excessive leak for any source, joint, unit? I am thinking Water Pump. I reviewed records and it was replaced in '06. I will probably go ahead and order water pump and a/c compressor unless a better idea for diagnosis pops up here. Any thoughts on where to buy?
Thanks!
Last edited by CigarXO; 05-21-2017 at 11:07 PM. Reason: UPDATE
09-05-2022, 02:54 PM
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C36
Let me share my current '95 C36 issue and see if anyone can help:
In the past month, I've been loosing a lot of antifreeze. Temps, oil and all indications are fine. Cooling system cycles on/off with heater on as expected. I replaced head casket, fan clutch, bearing, pulley; pulley tensioner and all coolant hoses a couple of years back. I know my AC unit is bad and will replace later this year.
From underneath, the coolant is dripping off center of oil pan from down middle of engine block beneath manifold. No fluids present up front on radiator or hoses direct to the radiator. Not particularly damp around fan/fan clutch. And no signs of fluids near back of engine or firewall.
I'm not familiar with where all the coolant goes through hoses under manifold and searching for diagrams/ideas?
EDIT: I ran the car with the heat on high. This dramatically increased the flow rate dripping off the bottom of the oil plan in center, driver's side. Cannot see excessive leak for any source, joint, unit? I am thinking Water Pump. I reviewed records and it was replaced in '06. I will probably go ahead and order water pump and a/c compressor unless a better idea for diagnosis pops up here. Any thoughts on where to buy?
Thanks!
In the past month, I've been loosing a lot of antifreeze. Temps, oil and all indications are fine. Cooling system cycles on/off with heater on as expected. I replaced head casket, fan clutch, bearing, pulley; pulley tensioner and all coolant hoses a couple of years back. I know my AC unit is bad and will replace later this year.
From underneath, the coolant is dripping off center of oil pan from down middle of engine block beneath manifold. No fluids present up front on radiator or hoses direct to the radiator. Not particularly damp around fan/fan clutch. And no signs of fluids near back of engine or firewall.
I'm not familiar with where all the coolant goes through hoses under manifold and searching for diagrams/ideas?
EDIT: I ran the car with the heat on high. This dramatically increased the flow rate dripping off the bottom of the oil plan in center, driver's side. Cannot see excessive leak for any source, joint, unit? I am thinking Water Pump. I reviewed records and it was replaced in '06. I will probably go ahead and order water pump and a/c compressor unless a better idea for diagnosis pops up here. Any thoughts on where to buy?
Thanks!
09-05-2022, 03:04 PM
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1999 C43 AMG, 2005 E55 Wagon
Had this on my 94 C280, which is also an M104.
It was a hose going to the firewall for the heater core. It's between the engine and firewall, but my memory is hazy.
It was a hose going to the firewall for the heater core. It's between the engine and firewall, but my memory is hazy.
