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Waste gate actuator appears stuck. Can't move it up or down by hand. I will contact Dave to get an expert determination. Cummins states thermostats don't fully open until 190. They start to open at 170. I verified this in a pan of water on the stove. Thanks again for all the great input on this issu...

1994 Serengeti Ivory, 8.3 Cummins, 150,000 miles, runs excellent. I have been battling overheating for a long time I must resolve the issue to be able to use the mh in the summer. Previously I had been unable to travel very far due to caregiving responsibilities, now I can go, but not on a hot day. ...

I have a 94 Serengeti Ivory. The lights were made by Hella. They are still in business and may have a suitable replacement for the whole assembly. Should be way cheaper.