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thanks

​Brett: the hydraulic pump is mounted on side of engine so am guessing it is gear driven? I can not feel any looseness. I can see where wires plug into the pump on the fan but haven't disconnected them to see if fan goes to high speed or not. I might try unplugging these to see what it does I wouldn't think it could hurt anything while setting still and monitoring? I can not contact Freightliner Gaffney or Tiffin until the 4th as they r closed until then.

Brett: I traced the big hose from the hydraulic canister to the pump. it is mounted on lower side of engine so figure it must be gear driven? also see the wires on top of fan motor. I am going to unhook these wires to see if I can force the fan to high. it shouldn't hurt anything with it running and being monitored to see if I can get it to make the noise I told u about. Freightliner Gaffney nor Tiffin are available until the 4th and will try and contact then.

I have since found a broken exhaust pipe below the turbo, right where they go from heavy pipe to not so heavy about a foot below. Could this be causing the noise / overheating problem? It doesn't seem to likely to me, although that would be dumping a lot of exhaust right back in engine compartment and on engine. Don't know about noise though. I know what a turbo whine sounds like but not with the pipe broken and why would it keep whining for a while until it cooled down? I called Freightliner of Corpus today and they show where mine is broken it is flexible exhaust pipe on newer models so am going to cut pipe and patch with flexible tubing, has anyone else had this problem & if so have u tried fixing it with the flex tubing? thanks.

Thanks to everyone for the info. will check it out. MERRY CHRISTMAS!!

Will do 1st of week. Thanks again, Brett.

Brett. Thanks for the info. Will check it out. As far as the noise goes I can not duplicate it unless on road and won't be driving it until Apr or May and if it happens then I will get into shop if I can't find it myself. I suppose a person could take the pump off and have it checked out? thanks again!

Thanks! First trip with this unit, just bought this summer, previous owner did not indicate any problems but did not pull what we are. How do I find the hydraulic fan pump? Have heard that the thermostat and water pump do not go bad that often but this unit has been in service for 10 yrs? I know that there have been problems with these units but I would think it would be something that could be corrected?

Thanks for the info.I will check the CAC lines but if that were the cause wouldn't the noise be as loud on the rad side of coach?

It is a Freightliner chassis. and yes the hydraulic reservoir is full. Is the hydraulic filter really in the canister? We are in Port Isabel, TX. I am aware of shop in Pharr & one in Corpus. If anyone knows of any other or better please let me know. We will be heading toward Corpus in April. The noise seems to stop shortly after cooling down to 200. 225 may not be that hot but am afraid its just going to keep rising as after it gets past 200 it acts like its gonna keep going that bothers me.

Hello. I am new to the motorhome line and having problems with it overheating. It is an 2006 42 QDP Allegro Bus with the 400 ISL side radiator, and pull a trailer with boat and jeep on it approx. 10,000 lbs. worth. We didn't have any problems coming from IA until we got into TX. Then it started heating up up to 225 and the warning lights would come on this is by the Silverleaf. then I would pull over and let it cool down and start out again. It seems that if I keep it under 60 then I do not have the problem, but had been driving 65-70 mph before the problem started? I think I know most of the things I need to check and do but when the engine overheats I have a loud noise coming from the passenger side of the vehicle at rear wheel well like something releasing steam? it sounds just like a hot radiator noise if you have ever heard that. it is not as loud from the rear when I open the doors or as loud from radiator side sounds like a very high pressured whistle for lack of something else to compare the noise to. Any help or ideas on this would be greatly appreciated! I guess I didn't mention that there doesn't seem to be any signs of leak when parked. I did also have to change out the plastic surge tank at Lufkin which I thought could be the problem but no such luck. Thank you for any thoughts on this.