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Old 09-11-2015, 10:56 AM   #1
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Dash A/C Wiring Problem


I have a 2002 Dolphin class A, GM/workhorse P30 chassis with an 8.1 v8 gas engine.

My dash a/c quit working, but once in a while will turn on. Blower fan won't blow, but is capable. I found that there is no power to the dash mounted a/c control head, but when I add power (with a powered test light) all is well. At this time, there is no source power to the a/c control head. All fuses under dash and under hood have been verified good.

Does anyone know where the source power comes from for the dash a/c control head? Wiring schematics seem scarce! I did get a generic a/c schematic from workhorse, but obviously does not show the dash panel.

Any help would be appreciated.


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Old 09-11-2015, 11:17 AM   #2
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Usually the HVAC is powered by a fuse in the fuse/relay panel for driving functions. Since it works when you use a jumper wire, but only works intermittently on it's own, it sounds like a bad connection or a broken wire. You could trace the wire from the fuse panel to the dash, or replace the wire from the fuse panel to the dash HVAC power since the wire is probably inside a bundle.

Another place to check is the large green connector near the steering column. Many reports of overheated, melted connections because so much is switched by the ignition key.


Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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Old 09-11-2015, 06:04 PM   #3
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By the way, your chassis is not a P30. The 2002 Dolphin on the Workhorse chassis used the W22, not the P30. The '02 models were also available on a Ford chassis, but few of those were made. National RV installed the dash a/c components, so they won't be on any Workhorse schematics. You have an Evans Tempcon dash a/c system.

I once had a 2002 Dolphin LX...
Gary Brinck
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL
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Old 09-11-2015, 06:09 PM   #4
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Welcome to irv2.
Evans wiring diagrams.
Evan system controls
The Evans control valve maybe install incorrectly, cool air goes warm while on for AC Cooling.
Links in my signature may also help you on other items in your coach.
98KSCA, 99MACA, 03 KSCA-3740- 8.1 Chev-- ALLISON Trans, now in good hands
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Old 09-12-2015, 09:42 AM   #5
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On mine I had much the same problem.. Saved much money on haircuts solving it.. Finally got under the dash and looked at the terminal block to the right of the fuse block.. one of the terminals there is reserved for HEVAC but guess what. It was not populated. Finally found a wire (Whoever wired this damon or rather ordered the wiring harnesses was very nice. Wires carry TEXT LABELS one was Dash AC or HEVAC (forget which) From OMEY's web page I found it was hooked to either AUX-1 or AuX-2 (You have several such terminals in your RV. this one is for the fuse block to the left of the terminal block, they work together) Anycase.. on the fuse block on the far left are two cans, these are Short Stop Circuit breakers,, They open and stay open till power is removed.. The bottom one was the indicated breaker.. Sure enough hot to the touch.
Replaced.. all good now.
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dash, wiring

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