== ==
Probably a blown head gasket.
I had a split in the coolant hose that goes to the turbo. It sits down behind the engine and next to the firewall. It was very expensive to replace the hose and labor intensive because of how difficult it was to get to it..
A leaky mass airflow sensor or it can be a leak in the air intake hose.
There's no Volvo 850 2000. What you likely saw was a S70.
Severe Vacuum leak.
The engine rear seal pops out of position. The replacement has a better design.
To disconnect the hoses from the firewall of a 1993 Volvo 850, first ensure the engine is cool and the battery is disconnected for safety. Locate the hoses connected to the firewall, typically for the heater core or coolant lines. Use pliers to gently squeeze any clamps holding the hoses, then carefully pull the hoses off the fittings on the firewall. Be prepared for some coolant spillage and have a container ready to catch any fluid that may leak out.
Trouble code P0455 means: EVAP System Large Leak Detected
The Volvo 850 has two horns in front of the radiator, lift the hood and their they are.
There's no 2.0L. Volvo 850 engine. Only 2.3L. & 2.4L. ...
If all the antifreeze is disappearing after you turn off your Volvo 850, it could indicate a leak in the cooling system, possibly from the new expansion tank or related hoses. Check for any visible signs of coolant leaks around the tank and connections. Additionally, ensure that the cap on the expansion tank is secure and not damaged, as a faulty cap can cause coolant to escape. If the problem persists, consider checking the water pump and radiator for issues.
The diesel turbo can only fit on a Volvo 850 with a little fabrication.