98 Bonny. 3.8 regular.

Climate control panel flashes temp over and over and wont blow warm air.
Been replaced more than once, same thing.
Any thoughts?

No heat is most likely a failed airmix actuator. The flashing is a sign of a fault in the system.

What has been replaced more than once?

Probably the ECC head in the dash, I'm guessing. If that'* the case, it will do nothing to alleviate the problem. I can't recall a single case where the ECC head is bad, and RARELY is it the HVAC Programmer. Most likely a vacuum or airmix actuator issue. This, however, is a seat-of-the-pants random diagnosis. We don't have near enough information to make more than a WAG (wild-a$$ed guess) at what'* going on.

Do a little search on this particular issue - you'll find lots of good information on it. See if anyone else has had the same symptoms you have. If you have a rough time on the search, come back and let us know exactly what'* going on...is the fan blowing? Can you change where the air comes out? Etc. We'll be happy to help!

Recently I disconnected my battery for like an hour and after that ECC temp started blinking.To have hot air I have to set it to max temp.Apparently I'm not alone in this.So many people posted having this issue after disconnectiing battery.

Don't want to do anything yet,just wait for those 40 -50 cycles ,maybe it will fix itself.
What a peak of engineering creation.You change the battery and your climate controll stop working.
Next time you change the tire and maybe your airbag will deploy on the middle of the road by itself or your car take off into the clouds or you lose yourr engine etc.
This car is like full box of surprises.
No offense to hard core Bonneville enthusiasts but sometime t'* too much every week have new issue.
Did I mention that I need TPS to be changed too. Went bad few weeks ago.