Any car mechanics out there

leenowell · 2019-03-18T19:13:59+00:00

Hi All,I have a 2004 Audi A4 and am having coolant system issues. I seem to be forever bleeding the system as air keeps getting stuck in the heater matrix (so we have no heat) and more recently the temp gauge seems to be going up past normal for a bit and then goes back again. Also,the computer has started randomly saying it is low on coolant. I am assume both these symptoms are because air happens to have got to the sensors.There are 2 bleed points on it1. a hole in one of the hoses which goes to the heater matrix2. a nut on a metal water pipe on top of the engine which you undo a bit which lets air out.Based on my central heating experience ( :) ) I have brought the engine up to temp and then with the engine off (in case it sucks in air when bleeding) I loosen the nut on top of the engine and let the air/ water and air mix come out until it is water only. I then do the same for the heater matrix.Only other thing to say is that it seems to be losing water (needs topping up in the header tank) about once a week.I can understand there may well be a leak somewhere but don't understand why it keeps getting air in the system. Anyone have any ideas?thanksLee.