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 .

Asked by for the 1990 Volvo 740
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!
1 more answer
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..