Trying to remove the headrests from the front seats of a 1998 Buick Regal LS. Want to remove old sheep seat covers for cleaning. Can't find any release. There is a small hole in the back of each plastic base.

If there isn't enough swing room for a ratchet and socket, then you'll have to take out the bolts with a box end wrench.

should be able to remove the headrest by simply lifting it up depending on the type?

On both sides of the headrest spokes are little adjuster rings. Adjust the headrest up to the highest position. Push down on both of the adjuster rings. While doing that, pull up on the headrest and it will pop right up. Here is a link to help you with all other questions: http://www.clublexus.com/forums/ls400/18383-trying-to-remove-front-seat-headrest-on-ls400-dont-want-to-break-it.html

hold the release button in while pulling the head rest up,

When you pull it up all the way, you should see a very small hole at the base of the rod. Poke a small nail in there and that will release the catch.

Im doing the same thing.. Push the headrest full forward, then lift hard to get past last indent in pole.. This worked for the front as well.. i also could not find a hole to push

Most volvo headrest can be removed by releasing the catches which are on the back of the headrest on some models and on the front on others I believe on 960 they are on the back. To release the seat on a 960 look where the shafts should be then follow it down on the back where the seat back top stops then goes in press around that area you should be able to find the catch there pull up on the headrest while releasing the catch you have to do this on both sides. The headrest should come off this also works on 740 and 760 series the volvo 780 is a different story the only way to get the headrest off on that is to disassemble the seat

press and keep holding the release button between top of seat and the headrest and pull the headrest all the way up

There should be a button on the base of the headrest to raise & lower it. Push the button, and lower it. With the button pushed, raise the headrest, and pull hard. They ARE tight.