Keeping Our Cool: Replacing an RV Air Conditioner

Following a successful climb to a remote spot in the Black Hills of South Dakota, the turbo on our truck continued to give us problems. It became obvious that our desire to stay in higher elevations and cooler temperatures as we worked our way southwest would be risky. Not feeling confident our truck could get Tagalong up mountainous roads, we rerouted our course to stay on interstates in lower elevations. 

That took us to Albuquerque, where high temperatures were in the 80s in mid-September, definitely tolerable. While there, however, the air conditioner (A/C) in our main living area started making strange vibrating noises that rattled the whole rig. The unit continued to work, so we didn’t think much of it. To give it a break, we shut it off in the evenings and relied on the bedroom A/C or opened windows to keep cool.

We normally wouldn’t have ventured into the Southwest until October, but it appeared our first grandchild wasn’t going to wait until her Oct. 10 due date to make her entrance into the world. For that reason, we thought it best to keep making progress toward Arizona to help ensure we didn’t miss the special arrival. 

Warming Up

That decision took us to a remote campground in the desert near Deming, New Mexico, where high temperatures hovered around 90 degrees, giving us a very warm welcome to the Southwest. 

Despite running both A/Cs, we didn’t feel cool air in our fifth wheel. With sweat beading on his forehead, Bob turned off the main A/C and restarted it. It blew cold air for about 5 minutes, but that was it. With Arizona — and 100-degree temperatures — in our near future, we needed working A/C. 

After doing some research, Bob climbed onto the roof and took our main A/C apart to troubleshoot. He checked all the simple-solution items. None of those repaired the problem. It didn’t appear the issue would be an easy fix. 

Meanwhile, we reverted to leaving the windows open and toughing it out, running fans to circulate the warm air and opening our awnings to minimize sun hitting the windows and heating the rig. On hot afternoons, we’d drive a half mile to Dairy Queen for a cool, refreshing treat. But this stop gap could only last so long. It became clear we needed to replace the A/C. 

Hitting Snags

Bob ordered a new Coleman Mach unit from Camping World in Mesa, Arizona, and made arrangements for us to do the work ourselves at an organization we’re affiliated with to save on labor costs. This would also give us access to tools and equipment to help us get the old unit off the roof and the new one on. 

Our trip to Arizona went smoothly — until Tagalong sent smoke signals on the freeway about an hour from our destination. That incident and the ensuing damage derailed us for five days. 

When we finally picked up our fifth wheel from Cliff’s Welding, with practically a completely new underside, we drove straight to the location where we had permission to change out the A/C unit so we could get to work. We wanted to have a working A/C before parking and setting up for a monthslong stay.

Bob opened the box the new A/C came in and discovered it was not the low-profile one we thought we had ordered. The closest Camping World that had the size we needed in stock was an hour away. Bob loaded the unit into Gulliver and headed out to trade it for the right one. 

Replacing the A/C

After returning more than two hours later, Bob ascended the ladder to our RV roof to disassemble the existing A/C so he could remove it. He took off the shroud and traced around the edge of the unit so we could easily line up the new one in the right place. 

Then he removed four lag bolts and unplugged the wire harness, setting the factory-installed unit free. Years of dirt had accumulated in the thin space under the A/C. Bob took time to clean the area before installing the new one. 

We hoisted the new unit onto a scissor lift, only to discover the lift didn’t have enough juice to do the job. It needed to be charged. ​

Our friend Tim hopped on a forklift and raised the forks up to the roof height of our RV. Bob and I loaded the old unit onto the forks, and Tim lowered it to the ground. Then he reversed the operation and lifted the new unit to our roof. 

Bob and I unloaded it and positioned it in place. Reinserting the four lag bolts into the original holes on the roof proved challenging. After struggling for a bit, Bob got three of them to line up correctly. Aligning the fourth required drilling a new hole to ensure the unit would be secure when traveling 70 mph down the freeway. 

After straightening the unit’s fins and plugging in the wire harness, Bob had me turn on the A/C from inside the trailer to see that it operated properly. With that confirmation, he installed the cover, cleaned up, and descended the ladder. 

We relocated, got both A/C’s cranking, and completed our setup in the nick of time. Our granddaughter, Chloe Elizabeth, entered the world about 33 hours later. We couldn’t be happier. 

You might also like Removing an RV Antenna.