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Re: Dash air failing to cool

Reply #25 –
Yahoo Message Number: 78383
Dave,

It's really not a good find as it deals with a home system.
Let's take it out of the realm of theory and put it to a test. An experiment if you will.
Assuming you have a car with a good A/C. Take your probe thermometer in the car with you on a hot day. When you get motoring down the highway, with the A/C on, take the temperature at the air outlet. If you are concerned that the system is recirculating, leave the windows open. I assure you that you will see closer to a 40 degree drop at a minimum. If it is really hot and dry the drop may approach 50 degrees.

Please, don't take my word for it. Test it.

George in Birmingham
'04 Allure 31038
George in Birmingham
2003 Magna 6298

Re: Dash air failing to cool

Reply #26 –
Yahoo Message Number: 78385
I should ad that, in addition to humidity having an effect on outlet temp, so does fan speed. The higher the fan speed the higher the temperature. I suggest a medium fan speed for this experiment but can easily live with the results with the fan on high.

George in Birmingham
'04 Allure 31038
George in Birmingham
2003 Magna 6298

Re: Dash air failing to cool

Reply #27 –
Yahoo Message Number: 78386
My 98 Allure Dash air was weak compared to my 04 Intrigue. I measured the temp at the vents directed at the driver and passenger and the outlet temp was 36 degrees with an outside temp of 90 degrees with the fan set one notch above low. Hope this gives you some help. If you are wear shorts the air will give you goose bumps even if the temp is 110 degrees out side. There is no way the roof aires can compete or equal my dash air.
TWI 2004 Intrigue 11731

Re: Dash air failing to cool

Reply #28 –
Yahoo Message Number: 78401
Tom,

Late in '03 since CC replace the 16,500 BTU chassis A/C with the 19.000 BTU unit in your Intrigue and my Allure. When these units are leak free and properly charged they are very effective.
The way I cool my coach on the road works well, though the coach is short at 33 feet. On a hot humid day I run the A/C just above the slow fan speed set on A/C which brings in fresh air. I open the roof vents about an inch or two without the fan running. This allows the warmest air in the coach to be evacuated out the roof. I aim the dash outlet vents to the center of the coach and the side vents toward the sides. I do have the heater hoses clamped to prevent any flow into the heater core. This brings in fresh air, cools it and drys it.
It it gets really hot and I am traveling into the sun I'll close the roof vents, turn on the generator and just the rear roof air and set the dash A/C to recirculate. That gives me the rear unit at 15,000 BTU and the dash unit at 19,000 BTU for a total of 34,000 BTU. Any comfortable temperature can be reached with this setup. I ran the same way in a 40 footer SOB previously and the results were the same though the rear unit was 13,500 BTU and the dash unit capacity is unknown by me.
If the dash A/C is not working well then everything changes. I had mine repaired for leaks two years ago. The leaks were at the compressor mounted access ports where the hose was connected. I had the hoses shortened a couple of inches to get to good rubber. Also replaced the ports. I have over 117,000 miles on the coach and always have the HVAC set to a position which runs the compressor. That helps to keep the seals oiled.
I'm glad yours works well Tom. It really helps make the coach a treat to drive.

George in Birmingham
'04 Allure 31038
George in Birmingham
2003 Magna 6298

Re: Dash air failing to cool

Reply #30 –
Yahoo Message Number: 78405
Gil,

I use the common single hand gripper type clamps sold at Home Depot and Lowes. The single, main supply hose splits into two supplies in the area above and the passenger side of the generator on my coach. Those two hoses go into the split heater core. I use one clamp on each and simply squeeze them off so no water will flow to the core.

When winter comes I remove the clamps.
I just put a picture of the clamp I use in the Photos section in the Album "George in Birmingham"

Good luck.

George in Birmingham
'04 Allure 31038
George in Birmingham
2003 Magna 6298

Re: Dash air failing to cool

Reply #31 –
Yahoo Message Number: 78407
Somewhere in that plumbing is a heater control valve (I think the tradesmen call it the "H Valve"). If you have to clamp off the heater hoses, I'm betting you have a defective valve.
I had two replaced under warranty in the first year of ownership. The third one works fine.

Jay

05 Inspire 51457

Re: Dash air failing to cool

Reply #32 –
Yahoo Message Number: 78408
Jay,

You're right. The valve on the Allure isn't really an "H" valve but is a variable flow valve controlled by the temperature selector on the dash panel. This is a valve sourced, as is the whole system, from Evans Tempcon. Both the passenger and drivers valves allow some coolant to pass even when off. I could replace them but my solution is 100% effective and has the additional benefit being free. I already had the clamps.

George in Birmingham
'04 Allure 31038
George in Birmingham
2003 Magna 6298

Re: Dash air failing to cool

Reply #33 –
Yahoo Message Number: 78409
George

Do you turn off the booster pump then?

Dave

aka Billy Byte (trusty hound)
2000 Allure #30443

Re: Dash air failing to cool

Reply #34 –
Yahoo Message Number: 78410
George & all,

Some of you have suggested to clamp off the heater hoses.
What type of clamp does the best job with minimum possibility of damage to the rubber hose? Where did you locate them for easy access so that they may be removed if heat is desired? Daron Hairabedian, 98 Allure 30226

Re: Dash air failing to cool

Reply #35 –
Yahoo Message Number: 78411
NAPA and others have a visegrip type tool that is designed to clamp shut a hose for maintenance and heater core replacement BOB

Re: Dash air failing to cool

Reply #36 –
Yahoo Message Number: 78412
Dave,

I don't turn off the pump. Might be a good idea though.

George in Birmingham
'04 Allure 31038
George in Birmingham
2003 Magna 6298
 

Re: Dash air failing to cool

Reply #37 –
Yahoo Message Number: 78413
Daron,

I put a picture of one of the clamps I use in the Photos section in the folder "George in Birmingham"
I put the clamps just to the passenger side of my generator and heater core. Very easily accessed for removal.

George in Birmingham
'04 Allure 31038
George in Birmingham
2003 Magna 6298