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Old 03-06-2017, 08:28 PM   #1
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Good evening all. Bought a (new to us) 98 National Dolphin 5350 with the P30 Chevy 7.4L vortek. I did not do what I have read on her to about making sure everything is checked out before purchasing, but it was a deal that was hard to pass up. I have been going through the systems. First I should say that the price was based on the fact that the auto park brake was not functional, thanks to the very helpful people and old used bear on this forum, I was able to make it functional again.😁 With original equipment. I have a new issue that I am dealing with now. I have fired up the gen and it runs like a champ, fired up the a/c and it blows fine but does not cool. Does anybody have an idea what to look for? Any help would be greatly appreciated.

Again, thank you, to all you old dogs who have been around these things and figured out things and sharing your knowledge.
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Old 03-07-2017, 05:31 AM   #2
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Firstly

could simply need a recharge or o rings need to be replaced. The condenser filter could be clogged, condenser could be holed. If you had a gauge set I could help you further. I would recommend contacting an air conditioning service for grocery store coolers etc.

Good luck
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Old 03-07-2017, 11:07 AM   #3
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A/C

Do you have only one A/C unit?

Check your thermostat. Believe me, I know! Then give it some time to kick on. You may also want to be hooked to Land Electric and try the a/c and then go to your generator and try the a/c.

Good luck.
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Old 03-07-2017, 03:56 PM   #4
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Could be almost anything on a unit that old. Good suggestion to try it on shore power as well as generator. Make sure the unit is set to cool and not just fan and that thermostat is all the way down and let it run for an extended period. Those units have a time delay on compressor start-up and it may not be instantaneous. It may be as simple as a capacitor or as complicated as a bad compressor or coolant leak.

Good luck.
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Old 03-16-2017, 06:04 PM   #5
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A/C

I have a '96 very similar to yours. Had a problem like that on the rear a/c. The start capacitor for the compressor has a hard start built-in. It was burned up, but never shorted out. I got on the roof, removed the cover, and the cover on the metal box that holds the capacitors and installed a Supco hard start capacitor kit.



https://arnoldservice.com/wp-content...erBoostall.jpg
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Old 03-20-2017, 09:48 AM   #6
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I got up on the roof this past Saturday morning and removed the shroud and metal cover and found the capacitor burned. Went to a local A/C supply and bought a new capacitor. Also checked the front unit and everything there looks ok. On a different note. My rig has a reg axle and when I was under there hunting down a broke wire for the stop lights on the left side, I found the brake lines from the rear axle to the tag axle are capped off. Because I am new to tag axles, I don't know what goes there to control the brakes for the tag. Any help would be emenslly appreciated. Thanks
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Old 03-21-2017, 06:16 AM   #7
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Tag Axle

The brakes on the tag axle are very complex. Mine didn't work, but all the components were there. A vacuum line from the engine goes to a vacuum controller between the back axles on the passenger side, then to a brake booster/master cylinder. A brake line from the vehicle brakes goes to the vacuum controller. The controller applies vacuum to the booster, which causes the master cylinder to send brake pressure to the tag brakes. I tow a car and trailer most of the time and having the tag axle brakes made a noticeable difference. If you don't have a TOAD or trailer you may not need tag axle brakes.

I've attached a diagram I found on line.
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