center vent question-not the standard one. - Page 2 - PeachParts Mercedes-Benz Forum

rebreath · #16 08-22-2006, 06:36 AM

Quote:

Originally Posted by frankjnjr

Carnut: I replaced the aspirator hose to the in car air temp sensor. If I place a lighted match directly above the in-dash temp sensor grill and blow the match out, I would expect the lingering smoke to be drawn into the grill. However this does not occur in my car! Is there a way to determine if the temp sensor system is operational? The system was retrofitted w/134 by the prior owner. The a/c operates modestly well (center vent out-put) 40deg in a 95deg ambient at a steady 65mph. The heating system operates equally well with 120deg output at the side vents. The system appears to cycle the blower properly in both heat and a/c modes. I removed the pipe leading from the temp sensor where it enters the blower motor area thinking the disintigrated foam may have blocked the air passage. The pipe is clear?

canI use a solid tube?or do I have to put in a foam section?

Gil · #17 01-13-2007, 08:03 PM

Not sure why, but the original tube was foam, probably for a reason, perhaps to insulate the cabin air sampled by the dashboard sensor, thus making temperature adjustments by the CCU computer more accurate.

I just created and installed a foam hose from a 6" piece of foam pipe insulation from Home Depot (cost: $1.64). Simply put, I can't believe the difference in CCU performance replacing this part made. The fan speed now stays where I put it (low stays low, high stays high, auto still does what it wants, as needed). The temperature control dial now actually has a purpose and doesn't need to be cranked all the way up or down to have an effect. I heartly reccommend the foam vs. ordinary tubing option.

JimmyL · #18 01-13-2007, 10:41 PM

Quote:

Originally Posted by rebreath

any thoughts on the filter stone that I found in the line.is this a standard thing.

What is a filter stone?

Lycoming-8 · #19 01-13-2007, 11:09 PM

He was probably talking about a small sintered metal or ceramic filter element. However not sure where he thought it was supposed to be used.

Eskimo · #20 01-14-2007, 12:05 AM

Quote:

Originally Posted by rebreath

1-found a small brass filter"stone" in the 85 rubber bits from the boneyard.any thoughts....

Quote:

Originally Posted by rebreath

any thoughts on the filter stone that I found in the line.is this a standard thing.

Looking at a vacuum diagram for the ACC system, I see several locations where a "throttle (orifice)" is shown in a vacuum line. This would slow down the actuation of the vacuum element fed by that line. The legroom flaps, for example, don't snap open or shut abruptly.

I don't recall looking in one of those vacuum lines to see what they look like, but I imagine an appropriate sintered metal plug might serve admirably for that purpose.