When I checked my coolant level this morning I was shocked to found out it was totally empty. The night before when I arrived home I noticed some smoke coming from bonnet. I probably take it to the garage for a check but not sure if it is sensible to drive it after topping the coolant up or towing it?

mcs r56 2008

 

I would most certainty fill it with anything, even tap water before driving it to the shop.

 

depends on two things

how low the level is and how far you have to drive to a shop (too bad the GEN2 does not have at least a temp' gauge like the GEN1)

The smoke you saw was undoubtedly a coolant leak dripping onto something hot and the coolant cook off. Where's the leak and how big is it and is there ANY coolant left in the engine???? When you fill the tank, does it immediately empty by running out? ... The system can also get an air bubble in it and needs to be bled to get the coolant going to the engine again . . .

I'd fill the tank and start the engine at idle and see what happens. If the tank empties re-fill it. If you spot the leak and it is big you have your answer ... driving is a bad idea.

Ideally you want the motor to get up to temp so the thermostat opens . . but there is some risk . .

If you spot a small leak and the fluid in the tank runs into the motor and the drive to the mechanic is short (15 minutes ... 20) and you can keep the speed low you'll probably be OK. If you have AAA and the mech is inside your tow radius, why chance it?

Had similar in a Miata years ago and I made it to the dealer and that engine is still going strong ... 100,000 miles later!

08 huh? Thermostat housing is a very common source and that is usually a slow leak .... MAYBE you need to check the coolant level more.
often!

Mine leaked on my 07 in Jan 13 and cost me about $300 at a non dealer, MINI shop. My drip was small and I saw a spot under the car before it got serious so the tank never emptied . . .

 

I just had a similar issue .. noticed evening as I was leaving work and just randomly checking fluids, that my coolant reservoir was about 95% empty.

Filled back up with distilled water and made the 17 mile drive home. Let it sit overnight, and the next morning it was totally empty again.

Turns out the mechanical water pump failed. Luckily, it was covered under warranty, and then I paid out-of-pocket to have the thermostat housing, sensor, and hoses replaced as well. No point in doing the pump without the rest ..

 

My vote is a water pump leak. I've had two replaced on my 2007 MCS (38K and 60K). It was preceded by low coolant levels and wet spots under the car. Repair was about $700.

Second choice is the thermostat housing. Had mine replaced at 44K. Repair was about $400.

Once either of these are repaired, coolant levels just don't drop anymore.

Good luck.