Cool , I mean Hot.... Is this the viscous heater we have in our CRD's?
Denso heats up diesels..... http://www.sae.org/automag/techbriefs/0 ... techb3.htm (has the pictures showing the VM engine)
The pump (blue) in Denso's viscous heater is driven by the engine's serpentine accessory drive belt.
Heat is the primary waste produced by inefficient internal-combustion engines. Emerging high-efficiency engines such as the direct-injected diesels demonstrated in the project cars of the Partnership for a New Generation of Vehicles (PNGV) waste less energy in the form of excess heat. In cold weather, engine heat doesn't all go to waste, providing heat to warm the vehicle's interior and to defrost windows. However, in very cold weather, diesel engines cannot produce enough heat to keep an interior warm, so automakers are looking for alternative heat sources.
The inlet hose (green) carries coolant from the engine into the pump's housing, where it is heated by churning silicon fluid. The outlet hose (red) takes the warmed engine coolant to the heater core.
Heat pumps that use the vehicle's air-conditioning system do not work well at low temperatures, and the use of electric resistive heating elements are no better, according to Jeep. Electric heaters are likely to be used at the same time as other high-current systems, such as the rear defroster and headlights, and the combined current draw of such systems can overload conventional 14-V electrical systems.
A viscous heater developed by Denso, driven by the engine accessory belt, is an innovative heat source for cool-running new cars. The Jeep Liberty employs a viscous heater for supplemental heat in overseas models equipped with a direct-injection diesel, 2.5-L, four-cylinder engine. Toyota also uses the system in its diesel Land Cruiser, and Ford is expected to employ it in an upcoming diesel-powered model. When in use, the viscous heater draws about 1600 W from the engine at 1300 rpm.
The heater pump uses a common clutched pulley (red), such as those used for air-conditioning compressors, to engage and disengage the pump as needed to warm the vehicle's interior.
The viscous heater is a pump that churns a silicon gel to generate heat through friction. The heater warms the engine coolant as it passes through the pump's housing en route to the heater core. The pump is driven by the engine's serpentine accessory drive belt and engages via a standard air-conditioning compressor clutch. It turns on when the air temperature is below freezing and the engine is below its operating temperature. Once up to temperature, the pump disengages, letting the engine provide heat. But even a running diesel can cool off too much, such as when idling at a traffic light, so the heater will reengage if the coolant temperature drops.
- Dan Carney
Another post from a Jeep Forum may have some merit:
Supplemental Heater
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For those of you thinking of buying a CRD if you live where it gets cold you will appreciate the belt driven heater which they have included.
Strange thing is, if you live where it gets warm in the summer months you may think its a bit of a curse.
The reason is that it runs constantly - at least thats what the local stealership tells me.
The only time it stops running is when the AC is on, but even then it will cycle between the AC and Heater.
So in the summer you're libby is going to battle against itself - one half of the pulley system trying to cool you down while the other half is trying to heat you up!
Crazy eh!
Thats probably why the US spec CRD's are coming with an extra fan to help improve AC performance.
Anybody come across a CRD service manual yet? I was thinking it must be possible to put an over ride switch in to cut out the heater if its not required?
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but no damage occurs because I have the plug wire tywrapped to the plastic bumper grill and the plug usually yanks from the front as she is backing out. Many ambulance squads have special break-away 120 vac plugs for this very reason.
don't know what this will do to the glow plug life but at least the block is warm. I like the old fashion "Wait to Start" light because it told you to do just that. Ether starting fluid use is a no no due to the high compression ratio of the engine. Too much and boom boom out go the lights.
have not owned it through a winter so maybe I would have figured it out. I wonder how much time of my life I have wasted this summer waiting for that dam little red light to go off....seemed right, only takes about 2 seconds 