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Old 05-20-2002, 07:07 PM   #21
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heater core and a/c

On my recent trip I did some water temp checks.
I have no water temperature problems running my dash a/c, even when stuck in traffic. The outside temperature was around 90 degrees.
I was surprised by the different temperature running with the heater core shut-off valve open or close. With the core closed, I was running a good 15 degrees hotter (195 degrees). I guess the core acts like a small secondary radiator.
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Old 05-21-2002, 09:49 AM   #22
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It is considered a "trick of the trade" to turn your heater on, full bore if necessary, when making a loooooong climb, as well as shutting the dash air "off."
It does add additional cooling for the engine.
Better to be warm for a bit, instead of standing by the edge of the road, looking for help.
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Old 05-21-2002, 09:50 AM   #23
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Another concept open for opinions- I saw replacement fans at the Parts store yesterday- aluminum blades with rubber edges riveted on for max air flow, "even at low rpm". Might this be a good add on? JC Whitney has these also

Also what about using that "water wetting" agent.?
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Old 06-03-2002, 01:15 PM   #24
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Well I finally broke down and had my Dash AC Fixed. All it needed was a new fill valve on the High Pressure side and an evac and fill. While they were working on the Coach I had a new fan clutch and Alternator installed as well. Best $312.00 I have spent so far.

Now for the rest of the to-do list.......... Maybe I should just go rob a bank Just kidding.
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Old 08-03-2002, 07:38 AM   #25
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Need help on Dash A/C.....

I know it's been a while since all you talked about the dash a/c but I need some advice. My dash a/c doesn't throw out the air worth beans....I had it checked by a mechanic. He said the motor was working fine and the 3 speed switch was working but on high the amount of air coming out is really weak. He wonders if possibly there could be a duct or hose clogged or loose. Has anyone ever run into this? If so what's the best way to check? I assume you go through the dash to check it out. Do you get a good amount of air blowing out in you MH when you have it on high?

Any advice on how to get the air pouring out (if possible) would be appreciated. As mentioned above, the roof a/c's are great for the passengers in the back but even with those on the driver seems to bake without some air up front....

Thanks
Ken
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Old 08-03-2002, 10:02 AM   #26
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Ken. Check the water heater control valve. They have been known to leak, therefore adding heat into the AC duct.

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Old 08-03-2002, 10:14 AM   #27
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Thanks Andy. My problem hasn't been so much the air isn't cold. There's just not any real volume blowing out. Even on high speed it seems to barely come out, like something is clogged in the vent. Should I take off the dash and start exploring around to see if anythings come loose?

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Old 08-03-2002, 10:50 AM   #28
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Ken,

The dash AC in my MH is a modified aftermarket type unit. Kind of like the ones that folks added in the 06s and 70s to a non ac car. It has a front cover that all of the AC Ducts hook on to. I would assume yours would be somewhat the same. Mine is mounted in the center of the dash over the doghouse. I have som of the same lack of blow. It has low, and med. but high is no better than med. I wonder if there is a blower motor resistor that could be bad, not allowing all of the power to get to the blower????


We are getting rain again here today, this just might be the project to work on. I will let you know if I find anything.
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Old 08-03-2002, 04:23 PM   #29
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Ken,
Both sides of the blower housing have a grill cover. You may want to check if they are clogged up with lint and debris. If you pull the driver and passenger seat, access would be possible without too much disassembling.
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Old 08-04-2002, 01:24 PM   #30
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front cabin heat

while on this subject of heat in the cabin....has anyone done more than basic insulation around the engine area? My doghouse is well insulated, but a lot of heat still comes in at highway speeds, around it. Especially up by the driver's feet.
I insulated the small heat vent that goes directly to the riser for engine heat, to keep it from adding to the problem. I put some of that aluminum bubble insulator in the vent, and it helped some.
I am wanting to see if anyone used the mat type insulation pads you can glue in to the areas near the engine. I can keep cool at 90 degrees plus with roof air, until I hit the highway speeds and that heat seeps in. Then it is a struggle up front anyway.
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Old 08-04-2002, 02:08 PM   #31
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Alan,

I have the same problem with heat. I have noticed, early in the AM when parked with AC on, if I go under the hood there is condensation on the firewall right in fromt of the drivers side. I assume there is little or no insulation there. The glue on sound deading mats should help both with heat and noise. I am considering using the lead foam when I re-do my carpeting and covering the whole drivers side floor and sidewall. Now I just need a reasonable source for it.
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Old 08-04-2002, 03:36 PM   #32
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let me know how that goes. Also got a source for that insulation mat? I may look at JC Whitney.
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Old 08-10-2003, 04:39 PM   #33
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Perforation?

My AC is on the blink...I took it to a guy who does AC, and he couldn't find any leak after recharging and using a hi tech sniffer. Mine has been converted to 134 two yrs. ago. Now after two weeks, it's starting to blow less cool. I've made an appt. to see an RV guy who does AC...I hope he's familiar with RV ac's!
Anyway, the first guy told me that my doghouse insulation is all falling apart. I asked if he would replace...Homie don't do dat! I wonder what kind of mechanic he is?
So i opened the doghouse today and yep, it's trashed. It's that metallic paper with some kind of sponge stuck to the wall of the DH. So I'm lookin' around and I see that on the left side (driver's) close to the hinge, there's an opening to the engine compartment from the floor. It's on the outside of the DH edge so that's why I smell exhaust at times! (I need headers). I taped it but I think I will try to have someone weld it closed, or use liquid metal.
Where can i get new insulation for the DH?
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