Hello im Jordan, I own a Mk5 Golf GTTDI 2.0 with the BKD engine if that makes any diffence.
I am currently experiencing some issues regarding my whole cooling system. I will list below what issues i am having what i have done to try and resolve these problems.
So here goes:
Issue number 1- When i am driving the coolant low light flashes until the car reaches operating temp which i then have to pull over shut the engine off then restart it to clear the light (there is coolant in the system but it does not return to expansion bottle-Next issue). i have tries to fix this by replacing the expansion bottle and cap still no fix.
Issue number 2- When i remove the expansion bottle cap (Engine hot or cold) back pressure of air pushes all the collant back up through the to the bottle.
Issue number 3- There is absolutly no hot air in the cabin of the car ever. i have replaced the thermostat and coolant temp sensors at this point. still no fix as of yet.
I am really stuck as to what to try next. i have had the cylinder head tested for any leaks etc. but it has come back fine (i had this done as the Early BKD engines had "pourus Cylinder Heads". I later found out i have the Revison C head). I am told the waterpump could be faulty but i want to try find out a definate solution before i start putting money into replacemnt parts that dont need to be replaced. Is there anyway to test the waterpump ? I have access to Vag-Com which i will upload any fault codes i get from it onto here in the next 24 hours.
Basically long story short i need some advice on what to do next. Any help would greatly be appreciated