Posted by Hal --WA on December 04, 2008 at 13:01:24 from (208.81.157.90):
In Reply to: OT Gas Truck Preheater posted by Tom B...IN on December 03, 2008 at 17:51:48:
There are several different types of engine heater, including the frost plug heater, the lower radiator hose heater, the percolator tank heater and the heater hose model. The first 3 require that the coolant be drained for installation of the device and can be fairly difficult depending on how the vehicle is set up. I think it would be a real pain to install a frost plug heater in many of the vehicles I have, because there just is no room to work. The lower radiator hose heater isn't too bad if there is room around the top part of the hose, but on most rigs, you will really need to be bent over to do the work. The percolator tanks work great, but the ones I have used required the tank to be more or less upright in a space away from the exhaust system and require a fitting and hose to the block coolant drain as a source for the cool liquid to be heated. The other hose T's into the heater hose return line. They work great and are a first choice, if there is room for them.
The heater hose type heater I have installed fit right in a heater hose, and didn't require draining the system or anything except cutting a section out of the heater hose that returns coolant to the engine after it has gone through the heater core. It was very easy and heated the engine fine, as well as putting some heat into the cab. But it seemed to me that the heater put a flow restriction on the coolant going through the heater, and that the heater was never as strong after I installed it. But it was easy and the heater cost about the same as the percolator tank type. The core hole type and lower radiator hose type heaters were about $20 less costly.
If you install a heater hose type heater, it is important that there not be a valve in the heater hose circuit. If there is, and it is closed when you plug in the heater, the heater will probably burn out after it has boiled away the coolant around the element.
Good luck, I sure like having plug-in heaters on my rigs.
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