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CATEGORY LISTINGS > CATERPILLAR > C7 running hot in hill climb [ REFRESH ]
Thread Title:

C7 running hot in hill climb


Created On Tuesday October 09, 2012 13:54 Diesel Talk
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deereman
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Posts: 1
Joined: Oct 2012

Note Tuesday October 09, 2012 13:54 View thread in raw text format
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We have a 2001 C7 in a 36ft winnebago motor home. We just bought it 5 months ago and we have used it twice. The last trip, past weekend, we did a couple hill climbs and the engine was running a little hot. We would have to pull over and let it idle to cool down, once pulled over the temp would drop down very fast back to normal. I have checked the coolant and engine oil level and both are full. I found the water pump belt to be a little loose so i tightened it but it didnt help. The fan runs and pushes air but not really like a road tractor does, but this is a pusher engine so everything is backwards. Coolant was flushed and filled with new two years ago, im not sure if they used CAT ELC but with inly two years and 4,000 miles on the coolant i think any coolant would still be doing the job?? Could this be oil related, i know all about the HEUI system. I dont have pyro or boost gauges yet, wish i did. All in all it run great, starts up really good, it will just run hot a WOT.

What else can i check?

Any help is great.

Thanks, Patrick

-------------------------
2001 winnebago 3126 (C7)
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frliner
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Joined: Mar 2010

Note Sunday October 14, 2012 14:25 View thread in raw text format
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Check radiator. It may be plugged from dirt and etc. If possible plow out carefully from the inside out. Also a easy test you can do is when the engine fan is on put a rag close to the radiator and see if fan can suck it against the radiator.
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TDcrash63
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Joined: Sep 2007

Note Sunday October 14, 2012 15:45 View thread in raw text format
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Yep I agree most likely a clogged radiator externaly. Go underneath with a flashlight and look up at the fins from the fan blade side closely. Almost always plugged up solid with road grime. Get some solvent of good soap. Go to the car wash or get a pressure washer. Solvent it down. Wash from the outside holding the steam wand straight as not to bend the fins over and try to wash out. Better yet take it somewhere and have some one else do this as it is a very common problem on a rear engined coach and make or model. Usually takes 2 hors to get really clean. After that wash it out every 5000 miles or so at the car wash from the outside and you will not have that problem any more.
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