Hello everybody, I'm new to the forum and English is not my native language, so If I make mistake I'm sorry.
My story...
I bought a W204 2009 C200. I never had any problem with temperature of the car (Max that it got in traffic and hot hot days was 85/87).
When I did my service (oil change ) I decided to change the coolant (while once while driving in traffic on a very very hot day it reached 92 and the FAN DIDN'T TURN ON)...
When I went to the MB service they noticed a little oil like fluid in the coolant... He started the car, no white smoke was coming, the oil is CLEAN.
After we did the oil change (the old oil had no traces of coolant) he flushed the engine (engine off) and the reservoir and expcet for small slimy things nothing came out.
The mechanic also noticed that before the owner used BLUE coolant and now inside is RED.
After everything was done I drove home (around 10km) and I noticed small thins floating again in the coolant reservoir (he did say he didn't clean everything).
I called my friend who is also mechanic and he said to collect the small slimy things and floating thing with a edge of a towel. I did that 2-3 times when driving and until now I have no problem only from time to time the slimy things appear but no foam or anything..
My question is, what can cause this? Knowing that my oil is clean, dipstick oil is clean, on the cap there's nothing and the temp goes to max 87 when hot hot (the fan doesn't kick in, I dunno why but when I turn AC on it spinns) and only in traffic, when I drive it on open road or not sitting in place it goes back to 70-75 in instant)
What I collected after the flush was done.
(since I drove like 1k kilometers and therer's no more of this).
Now my reservoar looks like this
..
I can see the walls of the reservoar and the black plastic...It's a little dark but no sign of foam, no slimy coolant on the cap like Nescaffe or something like that...The dipstick is clean, oil cap is clean, temp goes to max 87 when staying in a busy traffic, when driving goes back to 70-75 .
Anyone with similar experience? The guy at MB said maybe its from the old coolant ( was not changed more than 3 years) or it was used wrong coolant.
Thank you for your time
My story...
I bought a W204 2009 C200. I never had any problem with temperature of the car (Max that it got in traffic and hot hot days was 85/87).
When I did my service (oil change ) I decided to change the coolant (while once while driving in traffic on a very very hot day it reached 92 and the FAN DIDN'T TURN ON)...
When I went to the MB service they noticed a little oil like fluid in the coolant... He started the car, no white smoke was coming, the oil is CLEAN.
After we did the oil change (the old oil had no traces of coolant) he flushed the engine (engine off) and the reservoir and expcet for small slimy things nothing came out.
The mechanic also noticed that before the owner used BLUE coolant and now inside is RED.
After everything was done I drove home (around 10km) and I noticed small thins floating again in the coolant reservoir (he did say he didn't clean everything).
I called my friend who is also mechanic and he said to collect the small slimy things and floating thing with a edge of a towel. I did that 2-3 times when driving and until now I have no problem only from time to time the slimy things appear but no foam or anything..
My question is, what can cause this? Knowing that my oil is clean, dipstick oil is clean, on the cap there's nothing and the temp goes to max 87 when hot hot (the fan doesn't kick in, I dunno why but when I turn AC on it spinns) and only in traffic, when I drive it on open road or not sitting in place it goes back to 70-75 in instant)

What I collected after the flush was done.
(since I drove like 1k kilometers and therer's no more of this).
Now my reservoar looks like this


..
I can see the walls of the reservoar and the black plastic...It's a little dark but no sign of foam, no slimy coolant on the cap like Nescaffe or something like that...The dipstick is clean, oil cap is clean, temp goes to max 87 when staying in a busy traffic, when driving goes back to 70-75 .
Anyone with similar experience? The guy at MB said maybe its from the old coolant ( was not changed more than 3 years) or it was used wrong coolant.
Thank you for your time