2000 323i weird overheating problem - BMW Forum

hbbodley · 11-26-2008, 06:27 PM

Here is what I have and what I've done maybe someone here can help. 2000 323I with 99k miles. Car had no heat then ran hot within 10 miles of my house. Had car towed in they put in a new thermostat, rad cap, pressure tested the system and did a chemical test to make sure I didnt hurt the head gasket. Car was fine for about 1 1/2 weeks then had no heat and ran hot again the same distance from my house. I opened the bleeder and filled the system with key on and heater on high. Car ran fine and I checked it when cold for a couple days and topped up the antifreeze. About 2 weeks later same thing happened the same distance from home. I bled it and it was fine until today( about 1 1/2 weeks later) when same thing happened at same distance from my house. I bled it and have been over 300 miles in the car today with no problems. Why am I getting air locked? Could the pump be bad? It always has pressure on it when I open the cap so I dont think I have a leak. Please help this is driving me crazy .

witeshark · 11-26-2008, 07:23 PM

It may be a good idea to check the heater core.

hbbodley · 11-28-2008, 12:11 PM

you mean flush it to see if its plugged?

witeshark · 11-28-2008, 12:37 PM

Yeah, check to see if it's clogged.

marti5 · 11-28-2008, 01:59 PM

When bleeding the system: Key pos II , Temp max and fan on lowest setting not highest.

I would not at this stage think its the pump, more the thermostat.

ptal7 · 12-01-2008, 01:30 PM

had the same problem. would say the car was running hot in weather temp below 32 degrees f. scared me 1st time it happened. just took it to dealership and told them what was happening and they fixed it. hasnt happened since ive taken it in

witeshark · 12-01-2008, 03:05 PM

Quote:

Originally Posted by ptal7

had the same problem. would say the car was running hot in weather temp below 32 degrees f. scared me 1st time it happened. just took it to dealership and told them what was happening and they fixed it. hasnt happened since ive taken it in

Can you include what they did for the benefit of other members with similar issues?

hbbodley · 12-03-2008, 02:07 PM

ptal7. any idea what they fixed? you get an invoice with parts or just labor charges.