School Bus Fleet Magazine Forums
Home | Profile | Register | Active Topics | Members | Search | FAQ
 All Forums
 Professional Garage
 Enter Forum: Professional Garage
 2006 Vision-fumes from heaters
 New Topic  Reply to Topic
 Printer Friendly
Author Previous Topic Topic Next Topic  

Active Member

15 Posts

Posted - 04/25/2013 :  05:27:12 AM  Show Profile  Visit busman01's Homepage  Reply with Quote
Hey guys-We have an 06 BB Vision w/Cat C7 that emits noxious fumes when the heaters are running.This has been an on-going issue for the past 3 yrs..seemed to start when someone put universal antifreeze in it.The system was flushed several times and correct coolant was added
which helped for a while but the fumes returned.The bus then had to have the injector cups replaced due to fuel in the water.The system was flushed again by Cat Dealer.Upon getting the bus back the fumes were as bad as ever.We then replaced all the coolant/heater hoses and flushed the system once again.That lasted a week before the driver complained about fumes again.Could this be a heater core issue?Any advice or suggestions would be greatly appreciated.

Active Member

13 Posts

Posted - 04/28/2013 :  5:11:31 PM  Show Profile  Visit jr4wdman's Homepage  Reply with Quote
If the cooling system is tight you would'nt be unable to smell the type of coolant in it.

Did somebody get something on one of the heater cores? candy, crayon, plastic? How about a bad blower motor creating an odd smell?
I know you said the smell seems to come and go with the type to coolant in the cooling system?

Is there something elese going on when the coolant gets changed or flushed causing one area or group of the heaters to get hotter, creating the smell?

Did you replace all the heater hose through out the the bus? Is there a heater core leaking/seeping? How about a hose clamp? Some of those behind the panels are near impossible to access to check and tighten.

I require silicone type hose clamps for all hoses and I ride my people about tightening all readily accessible hose clamps everytime the vehicle is serviced with a socket and ratchet. Cold soak leaks are a problem in this part of the country.

Go to Top of Page

Top Member

2181 Posts

Posted - 04/29/2013 :  07:05:54 AM  Show Profile  Reply with Quote
If you had silicone hoses and got fuel in the cooling system maybe the hoses are permeated with the petroleum still.

“The good thing about science is that it's true whether or not you believe in it.”
Neil deGrasse Tyson
Go to Top of Page


United States
350 Posts

Posted - 04/29/2013 :  09:09:15 AM  Show Profile  Reply with Quote
Hoses and coolant type should have done it - we had this problem with silicone hoses and "John Deere" (green) spec antifreeze on '07 BB A3RE's. Changed to Cummins blue coolant and flushed the systems and it went away. Smelled like dead fish.

"Growing old is mandatory. Growing up is optional."
Go to Top of Page
  Previous Topic Topic Next Topic  
 New Topic  Reply to Topic
 Printer Friendly
Jump To:

School Bus Fleet Magazine Forums © 2017 School Bus Fleet Magazine Go To Top Of Page
This page was generated in 0.03 seconds. Snitz Forums 2000