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Re: POSSIBLE LEAK FROM THE TUBE CONNECTED TO THE...
Pipe going to the fire wall is usualy the cabin heater. for the time being there should be 2 hoses going to the fire wall coolant in/out. remove them from the pipe on the fire wall and blank them off or if the hose is split replace them. it could be the heater core but that usualy leaks into the cab.
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Fuel tanks have a vent tube and a charcoal cannister to capture the gas fumes from the tank. It's possible there is a cracked or loose hose, faulty fuel cap, bad canister or a fuel leak and any one of many connections. Investigate for sign of raw fuel along the underside of te vehicle, and in the engine compartment. Attempt to follow the smell to isolate the location of a leak.
I do not know what "small tube connection" you would be refering to. The only thing I can tell you about coolant leaks for sure is LOOK UP. Coolant always runs downhill. Follow the coolant trail up and you will find the source of the leak.
This is also much easier to do if you use a cooling sytem pressure tester.
Is there a squealing noise like the pulley may have locked up? Make sure you don't have wiring getting hot.Check all areas near the exhaust and at the firewall area where the EGR piping comes off the exhaust. Make sure nothing is laying against the exhaust or catalytic converter. don-ohio
That sounds just like the condensation drain tube for the AC system, and if it is cool clear water coming out of it when the AC is operating instead of hot coolant, then it would be a normal condition and it is doing exactly what it is designed to do.
Also, if it was a coolant leak you would be low on coolant, and the engine would be getting hot.
That is the area the air conditioner vent drains. There aren't a lot of fluids possible - coolant, power steering fluid and transmission fluid are the only ones that would be in that position unless your windshield washer fluid leaks from the tubing. Brake fluid would be closer to the wheels. If the air conditioner runs at all it removes moisture from the passenger compartment and drains near the passenger side firewall. All the other fluids would hae a definite smell.
Could very well be coolant, depending on what color your using, orange, green whatever, but it should feel a little oily when you rub it between your fingers. Top up your bottle in the meantime, and have it checked, before it does worse, more expensive/extensive damage to your engine.
Very common fault is head gaskets. causing coolant consumption and bubbles in radiator. Run vehicle, have a friend accelerate once or twice hard, while you smell exhaust for sweet smell of burning coolant.