Hello Christine!

With research on your issue I found that your problem can be solved with Vinegar!

Here is a link to an About.com article that addresses your issue specifically

http://frugalliving.about.com/od/householdsavings/qt/CleanShowerhead.htm

If the vinegar does not work for you, you may need to pick up a stronger cleaner like CLR. Just repeat the same process in the article, except replace the vinegar with CLR or other mineral buildup remover.

If this does not resolve your issue, or if you have any more questions, please leave a comment on this thread and I will be more than happy to assist you in forther resolving your issue.

Happy New Year!

Feedback is appreciated!

You can take the two hoses off the heater core and using a garden hose with a spray end on spary in each openning untill the water runs through clear, I did this on a 1993 jeep that was putting out very little heat, When done replace the huses and top off with coolent.