I've read the posts and seen the pictures of dirty radiators on our 2nd gen's but I never thought mine was anywhere near the pictures I've seen. Lately, when hooked to my 5th wheel my engine temp has been getting warmer than I would like. I've looked at every angle I could to see if my radiator was clogged and I couldn't see anything that looked bad. I decided that since I'm going on a week long road trip with the trailer next week I would go ahead and pull the radiator to take a look. I was completely amazed at how bad the thing was caked closed on the front. So far I've got two cans on engine degreaser and two cans of brake cleaner into it and I've still got more to go tomorrow. So if your temps are up I highly recommend pulling your radiator. Eric