Hi,

That's good to know, Eric. My first and only experience with the disc type was a few years ago when I was putting a block heater on my daughter's 89 240. I wanted to have a spare on hand in case things went wrong and I had a heck of a time finding one.

The disc is a lot thicker than the cups I've remover before and I couldn't penetrate it with a screwdriver. I drilled a 3/16 hole in it and screwed in a 1/4 lag that I hooked to a slide hammer. I hit it repeatedly and hard enough that I thought I might break the block, but it wouldn't budge.

I though I'd put some heat on it, let it cool and try again. After making a cherry red spot the size if a penny, I heard a plink while I was hanging up the torch. Then I went and picked the disc up off the garage floor, a nice surprize.

I'm guessing they can be removed by driving the center inward with a blunt tool. I might have tried that at the time but I wasn't aware that the block was backing it up and thought it might have ended up inside. How do you remove them?

As an added note for reference, I put the heater into the second hole on the driver side. After removing the IAC valve and a few hoses, there's a clear place to work, and much easier than the recommended rear hole on the passenger side, which is painful. It's been working perfectly well.

Peter