Originally Posted by
MightyZ
Well we towed the Uhaul trailer(3K roughly)from SW Denver to Rapid City, SD yesterday. Outside temps around 68-72. On flats engine temps around 196-202, with no A/C on. Any small hills to climb. Temps jumped to 208-214 on climb and slowly dropped off on descent and flats.
Once in Wyoming, wife got sick of wind noise and we put on the A/C. Temps jumped to 208-212 on flats, 214-218 on hills. Was not happy!
We stopped at a rest stop to let everyone use the restroom and stretch the legs and I decided I was gonna unplug my EGR and Throttle Valve, to see if that helped. I climbed up on the front tire and then onto the fender, carefully to reach the throttle valve plug. As I was reaching and working, I put my hand on the back, topside of the radiator. It was hot, but a light bulb went on.
I jumped down, pulled back the upper shroud, and holy smokes, I was an idiot. There was the front of the radiator, caked in cotton wood, dust, dirt and bugs! I had tried spraying down what I thought was the front of the radiator, many times in the last few stops. But that was only the A/C condenser! How did I mess that up!!!
Anyway, they had an RV dumpstation on site so I pulled over there, popped the hood, drank some of the black tank flush water(not) and sprayed the actual radiator down, dirt and debris rolled off onto the ground! Closed up the hood and hit the road. Engine temps with A/C on 190-194, flats, hills, didn't matter. We had one large climb and temp climbed to 202, and dropped to 192 at the top.
Needless to say, I found my issue! Sorry for the long post, but hopefully it made a few of you laugh, either with me or at me. But, maybe it will help someother sorry sucker who assumes, they know what they are looking at. To slow down and look again. Thanks for all of your help and insight everyone! Side note to add, Unplugged EGR didn't make a temp difference for me. Plugged it all back in at fill-up and temps stayed the same.
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