Daneast1 Report post Posted May 23, 2017 My 2009 Coachmen CrossCountry 340 turbo diesel randomly runs hot. I have had clutch fan, thermostat, fluid and pressure checked, airflow, radiator fins cleaned. In most cases, when it runs hot and I pull over, let it cool off for 10-15 min, it runs fine for as much as 600+ miles. Had it to two different Freightliner dealers and couple RV dealers. No codes are reflected. Any ideas? HELP!! This has been happening for 14k miles! Share this post Link to post Share on other sites
manholt Report post Posted May 23, 2017 When you say, run hot...does it affect the way it drives? Shut off by itself? What is the coolant temperature? Share this post Link to post Share on other sites
dickandlois Report post Posted May 23, 2017 Daneast1, Welcome to the FMCA Forum! Cummins or Cat engine? I have had clutch fan, thermostat, fluid and pressure checked, airflow, radiator fins cleaned. Did they replace the Thermostat? When the engine over heats, are you running on flat ground, up hill or going down hill with the engine brake.. Do you have a side radiator with a hydraulic cooling fan setup? Rich. Share this post Link to post Share on other sites
Daneast1 Report post Posted May 23, 2017 Does not affect the way it drives. I haven't let it get over 218 before pulling over and letting it cool. I think it does have a point where it shuts down. Also, both digital and dash readout agree when overheating. Thermostat has been replaced. Doesn't matter going up hill or level. Exhaust brake doesn't affect it. Rear radiator Share this post Link to post Share on other sites
dickandlois Report post Posted May 25, 2017 Daneast1, Been pondering your over heating issue. Have the Cummins service checked into the possibility of the VGT Turbo sticking at times? Have you noticed any decrees in acceleration or a hesitation issue. Your coach has a 6.7 L engine Rear radiator with a clutch driven fan. Possibilities are a fan clutch issue, temperature sensor issue or intermittent connection, Controller for the fan clutch issue. A dirty CAC and Radiator would not come and go, but have they ever been cleaned? Rich. Share this post Link to post Share on other sites
wildebill308 Report post Posted May 25, 2017 Is it doing a re generation when it runs hot? Bill Share this post Link to post Share on other sites
dickandlois Report post Posted May 26, 2017 2 hours ago, WILDEBILL308 said: Is it doing a re generation when it runs hot? Bill Bill, the coach was built in 2009 - So it should be 1 year before the requirement for the DEF. Rich. Share this post Link to post Share on other sites
wildebill308 Report post Posted May 26, 2017 I was told before DEF you still had to re gen the particulate filter. Might be wrong. Bill Share this post Link to post Share on other sites
dickandlois Report post Posted May 26, 2017 1 hour ago, WILDEBILL308 said: I was told before DEF you still had to re gen the particulate filter. Might be wrong. Bill Bill, Looks like you are correct. So - We need to get more information or at least the driving habits of the original poster. Regeneration while driving (passive regeneration): Vehicles whose routes enable them to run at high speeds typically regenerate on their own. If the vehicle still needs to be regenerated, the driver can simply drive the vehicle at uninterrupted highway speeds for 20 to 30 minutes and the engine will automatically regenerate. Parked regeneration (active regeneration): Vehicles used for urban deliveries typically run at low speeds and may not produce exhaust temperatures that are high enough to regenerate the engine during operation. These vehicles typically require a timely parked (active) regeneration cycle to prevent permanent damage.Takes around 20 to 40 minutes to complete when setting. Rich. Share this post Link to post Share on other sites
dickandlois Report post Posted May 26, 2017 The above link posted overheating due to mechanical issues - regarding the cooling fan. This is the last post in a 340 over heating issue and I can not figure out how to cut this out of the post. A programming issue? If I can attach it would make sense to be able to remove an item. Rich. This is where the thread starts regarding the 340 overheating issue! In over my head Brett ! Can not figure out how to cut out the middle portion of the attached link(s), that is out of order and not required in the information Rich. Share this post Link to post Share on other sites
manholt Report post Posted May 26, 2017 Rich. I have Re-generation on my coach, Dec 09 chassis and 425 Cummins. It only affects the exhaust temperature and turbo (don't know why on turbo) but exhaust goes from normal 480-560 (depending on time of year ambient temp) to over 1,200 for 12 t0 15 minuets! My guess on OP's problem is a small overflow for coolant and a second thermostat that was not changed out. Share this post Link to post Share on other sites
jleamont Report post Posted May 26, 2017 Daneast1, how long has it been since the radiator was cleaned? Can you see through the radiator if you maybe hang a lamp on the inside and try from the rear of the coach? Share this post Link to post Share on other sites
Corona4me Report post Posted May 26, 2017 The Turbo spools faster during re gen to keep the manifold pressure up for Engine Performance, this is why some have Turbo issues later in the Engines life. Share this post Link to post Share on other sites
ckellerman Report post Posted June 11 (edited) For those of you who are experiencing frequent overheating with a 2007-2009 or similar year diesel pusher with a Cummins ISC 8.3l engine on a Freightliner XC chassis (mine is a 2008 Fleetwood Providence), here is my experience resolving the problem. The cause of this issue was that the Cummins ECM only provided a Fan Clutch control signal, while the Horton clutch was not designed to send a speed signal back to the ECM. Therefore, the fan clutch would not always engage to bring the fan up to speed after highway driving and slowing down to 20 to 30 mph. I found that most mechanics, including some Freightliner Oasis centers, were not aware of this issue, or even interested in servicing an RV over 10-15 years old. Subsequently, I had to do my own research to avoid thousands of dollars of extra costs. It appears that Horton recognized this issue around 2012 and issued Product Technical Bulletin PTB1202. This bulletin states: “If an overheat occurs, turn vehicle off, wait 5 min and restart. Be sure to verify the swage is not leaking. If clutch engages after the restart, install the following in-line device: 2007-2009 Engines: 995595 2010-2013 Engines: 994670” Since I had a 2008, I went to the Horton website (www.hortonww.com) and learned that part #995595 is actually two items (Anti-Rotation Bracket 995580 and the Guard Dog Viscous Speed Controller 994671). The Anti-Rotation Bracket has a 6 pin connector (instead of 2 pin) and includes a set of replacement fan bolts that must be torqued to 106 in-lb. These bolts allow the bracket to sense fan speed. The Guard Dog connects between the 2 pin ECM connector and the pin of the bracket. After installation, I have not had an overheating issue again. If you want to do this yourself, the parts cost around $650. If not, be careful who you have do the work and make sure they understand that they need to replace both the bracket and the Guard Dog controller. Edited June 12 by ckellerman Correction to 106 in-lb torque Share this post Link to post Share on other sites
wildebill308 Report post Posted June 11 Interesting. Thanks for posting and welcome to the forum. Bill Share this post Link to post Share on other sites
