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Topic: Rear Circulation Pump - Round 2:)! (Read 765 times) previous topic - next topic
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Rear Circulation Pump - Round 2:)!

Yahoo Message Number: 100284
I posted back in May of 2014 about a leak of our Rear Circulation Pump. On our coach, this unit is on the drivers side of the engine, and on the front side of the engine by the Allison, on  bulkhead. It pumps hot water to the front of the cab, to support the heating. As I understand it, most coaches also have a second Circulation Pump up towards the front.

Back in May, we had slight leak coming from this pump. And a nice mechanic was able to get up to it and tighten some hose clamps. This stopped the leak, until now. This leaks 'looks' like it is the start of the pump itself leaking, not the hose clamps. (Hard to really tell from the angles I can get on it with a flashlight.)

So, this time around, I'm going to follow some advice from other CC owners, and have this pump bypassed. Many have reported that they still continue to receive adequate heat in the cab area, with only the one pump. And a few have reported replacing the pump, just to have it fail again. It does not like to seem the ongoing heat of the engine area compartment.

My purpose for posting this is to see if anyone has any cautions about bypassing this? And, as just general info, as the 'search' feature are difficult on this board:)! Figured it might help others.

Best to all,

Smitty

04 Allure 31017
04 Allure Sold to a nice new owner! Now enjoying a 07 Magna Rembrandt 45' ISX600 #6775
"We're ONDROAD for THEJRNY!" (Toad and Coach license plates, say Hi if you see us!)

Re: Rear Circulation Pump - Round 2:)!

Reply #1 –
Yahoo Message Number: 100285
Hi Smitty,

I vote to bypass. That still leaves you two  alternatives. 1. Replace it if in the end if you don't like having bypassed it.  Or 2. Run the HydroHot while on the road if you are in cold enough conditions  that the one pump does not give you adequate heat. The only possible concern  that I can think of is defrosting the windshield but that doesn't take much  heat. Plus you have two auxiliary fans to point at it to help.
 BTW thanks for your complimentary comment in a  recent post. I only reply these days directly to the individual because for some  reason I never get to see my replies to the group. Not sure what is going on but  I am getting to lazy these days to try to get to the bottom of it. Not with  Yahoo anyway. I do from time to time see some what in my opinion is miss-guided  information but I bite my finger and move on. That however would not happen with  you or several other close friends that I have on the group. I want to reply to  the group but I just don't know if they are going anywhere.

Travel safe
Don Seager

Re: Rear Circulation Pump - Round 2:)!

Reply #2 –
Yahoo Message Number: 100286
I had my rear pump by passed 6 years ago.  Fortunately  I have the ISL engine instead of the C-12 or13 and the service tech that came out on an emergency call just crawled in the engine compartment on top of the engine and by passed the pump.  I had called Chris Snyder and he said it was common practice, and that the pumps should never have been installed in the engine compartment in the first place.  To much heat for a pump with plastic parts.  I had to have the system drained and new coolant installed by Cummins in Gillette, Wyo, which was much pricier than by passing the pump.  Thank you- Coach net.  TWI 2004 Intrigue 11731.

Re: Rear Circulation Pump - Round 2:)!

Reply #3 –
Yahoo Message Number: 100288
Smitty,

Add me to the list of bypassers. Cummins of Sacramento bypassed mine about four years ago. No ill effects. Everything has been fine. Few dollars in parts but $500 total bill. I think the tech did it all from beneath the engine. That may have been why the bill seemed high.
Daron Hairabedian, 98 Allure 30226
 

Re: Rear Circulation Pump - Round 2:)!

Reply #4 –
Yahoo Message Number: 100290
I have an 06 intrigue 12047 with a ISL 400 engine. I asked my cummins tech that I use on A regular basis to find the coolant circulating pump in the engine area. He said I do not have One in the back or the front of the coach. He also said that the pressure the engine puts out Does not require any additional boost to supply the front heater  I can only assume that my coach did not come with a boost "school bus" pump. Bob