Originally posted by sixto
A bad monovalve will provide some heat at low engine speed and little to no heat at high engine speed. It takes a few minutes to check your monovalve so it's hardly worth speculating.
Do a search on monovalve and username sixto. Also check out http://photos.yahoo.com/tabijan. One of the albums has photos of how to get to the monovalve.
I have the same problem and just got my car back today after spending a total of 500.00 to get it fixed and still there is no heat when I hit the higher speeds. I went to the link in the above post but it doesn't work....Can you or would you mind elaborating a little more on the monovalve thing.....I would appritaite it. :-/
65 Bonniville convertible