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Baffled by Heater in 1984 Bluebird (GMC Diesel) John 1-2-05  
Hi,
I'm a teacher in Tucson, and a fellow teacher and I are converting our bus to run on veggie oil. We're mystified by the heating system, and can't figure out if the problem is with us or the bus.
There are 2 (apparently retrofitted) gate valves that come off the top of the water pump assembly. Hoses run from them out and back to the heater. No matter what we do, though, we can't seem to get coolant to flow through those hoses. We replaced the valves; the radiator heats up (which we suppose means the water pump and thermostat are working), but no flow to the heater.
Does anyone out there have advice about this.
Thanks,
John
Re: Baffled by Heater in 1984 Bluebird (GMC Diesel) David 1-2-05  
Hi John

We have a '95 IHC with the Bluebird body, DT408 diesel engine. The setup is similar. There are two shutoffs on the engine for the heater hose running through the interior.

I don't know if this will help, but next to the driver seat on the left in our bus, on one heater unit, there is a shutoff handle (similar to an outside faucet handle). Is it possible there is something similar in your rig but perhaps less easy to spot...
Re: Baffled by Heater in 1984 Bluebird (GMC Diesel) John 1-2-05  
Thanks for your reply. We have the same setup, but the coolant doesn't seem to flow at all, much less as far as the radiator to the left of the driver's seat. Still dumbfounded.
John
Re: Baffled by Heater in 1984 Bluebird (GMC Diesel) Robert 1-3-05  
I think you should look at the Thermostat in the engine could be partially/completely closed. By the way I also live in Tucson and I work at a School Bus Dealer here in town.
Re: Baffled by Heater in 1984 Bluebird (GMC Diesel) bob 1-31-05  
The water pump on the engine is not strong enough to pump water through the entire system on the drivers side there should be a ciculation pump this should be running or you will not get heat when its cold out tthe switch for that is on the counsole the pump is in front of the wheel well
Re: Baffled by Heater in 1984 Bluebird (GMC Diesel) Robert 1-3-05  
I realize you stated that the radiator is heating up, but how much is it heating up? Have you driven this bus on the Freeway yet? I think its a coolant flow problem.
Re: Baffled by Heater in 1984 Bluebird (GMC Diesel) Elliot 11-26-06  
Hmmm... almost two years later... did you solve it?

Did you remove the rearmost heater way back in your bus? Did you plug those hoses, or cap them with a short hose bent in a U shape? If you did, that would stop all flow thru the system.
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