heat is getting the engine hotter more than norma . I have disconected it.. on 1990 Volvo 740

it started just when I was trying to get warm inside my car , using the heating . Then the
needle starts moving out of the normal ,showing how hot the engine is getting , started pulling up. So I have decided not to use the heating .

2 answers
Not sure what this is, but you need to get this looked at very soon by a shop or someone that can diagnose this for you.
Overheating this engine is the number one reason for engine damage, so don't let it overheat!
it sounds like the heater core might be clogged-up. try flashing the entire sysem out or check the heater core physically by taken it out..