Water sloshing sound when starting: Ford Fiesta MK6 2007

[klaudmjj]

Recently I've noticed a water sloshing sound when I start the car. Seems to disappear or go less noticeable after I start the car.
Read about it online and its due to air inside the system, meaning there is a leak somewhere.
Checked the coolant reservoir, its below minimum marking.
Engine temp is normal. I don't see any puddles of coolant underneath my car. Where could this leak be or where is a good place to start looking.

[underwhelmist]

Have you topped the coolant up? NB make sure the engine is cold before you open the cap!

There might be a procedure to bleed the cooling system but you’d have to look up the right procedure for your car.

Edit: I’ve never heard of air in the cooling system making a sloshing noise though.

Edit 2: I just saw your servicing thread. Did this start happening after you replaced the coolant?

Edited by underwhelmist on Tuesday 14th July 20:08

[klaudmjj]

underwhelmist said:

Have you topped the coolant up? NB make sure the engine is cold before you open the cap!

There might be a procedure to bleed the cooling system but you’d have to look up the right procedure for your car.

Edit: I’ve never heard of air in the cooling system making a sloshing noise though.

Edit 2: I just saw your servicing thread. Did this start happening after you replaced the coolant?

Edited by underwhelmist on Tuesday 14th July 20:08

No actually, this was one of the reasons why I wanted to flush the system. I got the car in March with around 58000 miles on it, I've done about 1300 since I Had it. I believe at the start when I got it the coolant was between the min and max, now it's about an inch underneath the minimum marking. I haven't topped the coolant up that will be my starting point.

Edit: Since there is air in the system, the coolant has a lot more space to slosh around and bounce around which makes that noise.

Edited by klaudmjj on Tuesday 14th July 20:35

[klaudmjj]

Update: Just flushed and filled the system with brand new coolant. While i was underneath taking the hose off to flush the system, I saw that my oil pan screws are stained pink, i looked up and the thermostat is leaking, not a lot, I would say I lost about 500ml of coolant over 3 months. How hard is the thermostat housing to replace?

The coolant reservoir is okay, it holds pressure.

Might put some rad weld to see how that goes.

[finlo]

klaudmjj said:

Update: Just flushed and filled the system with brand new coolant. While i was underneath taking the hose off to flush the system, I saw that my oil pan screws are stained pink, i looked up and the thermostat is leaking, not a lot, I would say I lost about 500ml of coolant over 3 months. How hard is the thermostat housing to replace?

The coolant reservoir is okay, it holds pressure.

Might put some rad weld to see how that goes.

No no no no no

[klaudmjj]

finlo said:

No no no no no

Why not?

[Krikkit]

klaudmjj said:

Why not?

It's a crap bodge. Replace the stat, it's not too tricky a job.

[klaudmjj]

Krikkit said:

It's a crap bodge. Replace the stat, it's not too tricky a job.

Will do, ordered a new thermostat and thermostat housing.