BMW 1998 528I major overheating issues.

I doubt it.
A faulty thermostat would cause the engine to overheat after a few miles of driving. A faulty cooling fan could cause the engine to overheat and also keep the ac from working.
A leaking head gasket could cause overheating, and loss of coolant, but would not affect the ac.

you have to find out why it's overheat ,trans.pipe bent,cooler restrictions,
the pcm know trans.overheat and goes to default mode
have code retrieve

If it has an electric pump you should hear or see water flowing when car is turned on. If not, check any fuses or relays for the pump, and there is probably temp sensor controlling the pump. The main thing is to make sure any fuses and relays are working before tearing the pump out.

For car running hot and overheating issues, I suggest to you go through this help links. Click this link below and go through the troubleshooting procedure to take care of the problems: ----Car runs hot? http://howtobyme.blogspot.com/2011/11/car-runs-hot-in-traffic.html
-----------All types of car overheating problems and troubleshooting?

http://technoanswers.blogspot.com/2011/11/all-types-of-car-overheating-problems.html
Car freeze overnight and started overheating while driving?http://technoanswers.blogspot.com/2012/01/car-freeze-overnight-and-started.html-----------Engine Overheats and heater blowing cold?

http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

---------------------------
Car overheats and Air blows hot at idle?
http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
--------overheating? http://schematicsdiagram.blogspot.com/2011/12/buick-century-overheating.html
----------Car engine Overheats and transmission starts slipping?http://schematicsdiagram.blogspot.com/2011/12/car-engine-overheats-and-transmission.html
----------This details will help.Thanks.

For car running hot and overheating issues, I suggest to you go through this help links. Click this link below and go through the troubleshooting procedure to take care of the problems: ----Car runs hot? http://howtobyme.blogspot.com/2011/11/car-runs-hot-in-traffic.html
-----------All types of car overheating problems and troubleshooting?

http://technoanswers.blogspot.com/2011/11/all-types-of-car-overheating-problems.html
Car freeze overnight and started overheating while driving?http://technoanswers.blogspot.com/2012/01/car-freeze-overnight-and-started.html-----------Engine Overheats and heater blowing cold?

http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

---------------------------
Car overheats and Air blows hot at idle?
http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
--------overheating? http://schematicsdiagram.blogspot.com/2011/12/buick-century-overheating.html
----------Car engine Overheats and transmission starts slipping?http://schematicsdiagram.blogspot.com/2011/12/car-engine-overheats-and-transmission.html
----------This details will help.Thanks.

For car running hot and overheating issues,i suggest to you go through this help links. Click this link below and go through the troubleshooting procedure to take care of the problems :----Car runs hot? http://howtobyme.blogspot.com/2011/11/car-runs-hot-in-traffic.html
-----------All types of car overheating problems and troubleshooting?

http://technoanswers.blogspot.com/2011/11/all-types-of-car-overheating-problems.html
Car freeze overnight and started overheating while driving?http://technoanswers.blogspot.com/2012/01/car-freeze-overnight-and-started.html-----------Engine Overheats and heater blowing cold?

http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

---------------------------

Car overheats and Air blows hot at idle?
http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
--------overheating? http://schematicsdiagram.blogspot.com/2011/12/buick-century-overheating.html
----------Car engine Overheats and transmission starts slipping?http://schematicsdiagram.blogspot.com/2011/12/car-engine-overheats-and-transmission.html
----------This details will help.Thanks.

Have you checked your coolant levels as well as thermostat and waterpump functions? These can all atribute to engine overheating.

I have the same problem developed with my 2002 325i.
Mine would have this problem after about 20 minutes of driving.
Anyone know what is causing this?
Changed ABS sensor, no improvement.

Do not drive the car until this is corrected, as major damage can result, and may have already occurred. What is the coolant level? Is it full, or empty, or have you had to add a little or a lot recently? What is the oil level? You say you added oil, did you fill it to the correct level? Is it overfilled? Overfilling with oil is as bad as running with low oil. If it is overfilled, drain it to the correct level. When the car warms up (10 minutes) and the temp gauge goes up, are the cooling fan(s) turning on? If they aren't, that could be your overheating problem. It could also be a thermostat that is stuck closed, or partially closed. Rust and sludge in the cooling system can also cause overheating. Has the system been flushed every several years? So, answer all my questions, and I'll try to narrow the cause some. The fact that the engine 'rattles' when the car starts is a concern, as well as the overheating.

You actually need the thermostat in to pressurize your cooling system or the coolant won't cyle through the radiator, it'll just cycle around the engine. Most people think without the thermostat in the coolant will just pump freely through the engine and radiator, but it doesn't.

Chuck in a new thermostat, purge the air out of the system and see if it overheats then. I gaurentee it won't, if it does then you've got head problems (but they should already be obvious by now).