Furnace November 16, 2022, 08:28:28 am My cab heat isn’t working. It only blows cold air. Can I temporarily use my propane furnace while driving until I get the heater fixed? I drive a 98 23.5 ft LD.
Re: Furnace Reply #1 – November 16, 2022, 10:33:07 am Hi Hugh; Welcome back. Yes, you can use the coach forced air heat while driving. I think this is pretty unusual that the dash heat isn't working. Does the control that changes the air output from floor/to vent/to defrost change the air flow around? It could be the 'blend' door not working. In '98 there were still GM chassis, do you have the Ford V10, or GM? If the Ford, it is the left knob that adjusts how much hot air is mixed with cold air before it comes out of your vents. RonBedit: that blend door control is just above where the right foot of the passenger would be (if you had a passenger), so you might just want to look up there (flashlight recommended) to see if the hose just came off, or something is blocking the lever from moving. Might be a 'quick' fix. RB
Re: Furnace Reply #2 – November 16, 2022, 12:03:41 pm Quote from: Hugh - November 16, 2022, 08:28:28 amMy cab heat isn’t working. It only blows cold air. Ron has already answered the furnace question.Does your LD's A/C work or is the entire HVAC system out of action? A common issue is a lack of vacuum to run the system, caused by rodents chewing through the vacuum supply line, located under the hood on the far passenger side.At your rig's age, It's possible the heater core is plugged, have you had it looked at by a mechanic?Larry
Re: Furnace Reply #3 – November 16, 2022, 12:25:32 pm "Does your LD's A/C work or is the entire HVAC system out of action? A common issue is a lack of vacuum to run the system, caused by rodents chewing through the vacuum supply line, located under the hood on the far passenger side."This is exactly what happened in my Pleasure-Way 2008 Ford V-10 chassis. It is quite visible when looking under the hood, right up against the windshield area. A bit of tape fixed it handily, but not clear if that is good enough for a permanent repair. Virtual hugs, Judie
Re: Furnace Reply #4 – November 16, 2022, 12:32:08 pm Quote from: Judie Ashford - November 16, 2022, 12:25:32 pm"Does your LD's A/C work or is the entire HVAC system out of action? A common issue is a lack of vacuum to run the system, caused by rodents chewing through the vacuum supply line, located under the hood on the far passenger side."This is exactly what happened in my Pleasure-Way 2008 Ford V-10 chassis. It is quite visible when looking under the hood, right up against the windshield area. A bit of tape fixed it handily, but not clear if that is good enough for a permanent repair.Many times, the vacuum hose is completely gone, requiring getting into the dash to repair or replace it.Larry
Re: Furnace Reply #5 – November 16, 2022, 02:20:47 pm Hi Larry. I bought a new Ford reservoir and a check valve. It went in perfectly between the metal crash plate and the vent duct on the passenger side. (double sided tape) The hoses and new valve ended up just above the inertia switch far passenger side. I pulled up the chewed up vacuum line stub from somewhere near the fender wheelwell, and ran it inside the engine compartment with a through hole just above the doghouse clamp screws. Out of the way, easier to get to. and works well. In addition to the new damage I discovered a previous fix. Evidently while my cutaway chassis was sitting at LD, (before my build), a mouse ate through a vacuum line, and LD repaired it, underneath where I hooked in to the vacuum lines going to the damper valve. RonB
Re: Furnace Reply #6 – November 16, 2022, 09:05:42 pm RonB, We are working on this reservoir and rodent chewed hose problem right now. We ordered the Dorman 47076 Vacuum Storage Canister and a check valve which I had read about here done a couple years ago. I have not begun the full investigation of the problem but it fits the description. I have not seen any evidence of a rodent cause but I have not checked it out fully yet. I will get to it this weekend and report back here if there is a different outcome source? Karen~Liam 98 ~ MB NinA
Re: Furnace Reply #7 – November 17, 2022, 04:27:27 am Hi Liam; There is a YouTube video about a chewed vacuum line, but I found this one, and it explained a fix better. https://www.youtube.com/watch?v=-192lHUs8nY There are more vids. Ford located the reservoir inside the fender near where the cut off radio antenna is. Too hard to get to. Amazon had the tank: Ford Reservoir - VAC + Free Shipping and the valve: Motorcraft YG193 Vacuum Checking Switch and the 3 mm. line: Amazon.com: QuQuyi 1/8" (3mm) ID x 3/16" OD Silicone Vacuum Tubing Hose... Instead of taking out a bracket screw, I drilled a hole above the bracket. Used a grommet, and caulked it on both sides. Tywrapped the new vacuum hose to some other wiring. I borrowed about 2" of a 1/4" silicone line from my aquarium air pump to splice a line onto the valve. I just yanked the line out of the rubber grommet down by the passenger's foot, and enough came through from wherever it had been chewed to hook up the new tank. Hope this helps. RonB 6 Likes As an Amazon Associate Lazy Daze Owners' Group earns from qualifying purchases.
Re: Furnace Reply #8 – November 17, 2022, 07:01:30 pm I utilized the same video to repair mine as well. I was having a problem with the AC cutting over to defrost when the engine was under load. Repair is working well after a couple of years. 1 Likes
Re: Furnace Reply #9 – November 17, 2022, 08:45:44 pm Quote from: RonB - November 17, 2022, 04:27:27 amHi Liam; There is a YouTube video about a chewed vacuum line, but I found this one, and it explained a fix better. https://www.youtube.com/watch?v=-192lHUs8nY That is a great repair method, wish I had known about this ten years ago. It is a nightmare pulling the dash apart to get to a chewed vacuum line, this method takes about 1/10th the time.Wonder what is so tasty about vacuum lines?Larry 2 Likes
Re: Furnace Reply #10 – November 17, 2022, 10:30:35 pm “Wonder what is so tasty about vacuum lines?“There are two reasons that rodents chew wiring and hose, not to mention most other plastics. Rodents’ incisor teeth never stop growing. Hence, rodents chew on harder materials to file the teeth, keeping them sharp and from getting too long to function. Rodents also chew when they smell something that they sense may contain food or water. When I was a young “climbing bum” living in a VW van, a mouse somehow got aboard. It took weeks of hunting and cursing, and ultimately a complete unloading of the van to locate the mouse. I. The mean time, the mouse chewed holes in hoses, boxes, bags, wires - anything that offered a way to file down those incisors. I’ve added “no rodent problems” to my growing list of reasons why I am happy to pay bit more for indoor motorhome storage (others include catalytic converter theft, deferred roof seal replacement, less frequent waxing, etc…)!W 10 Likes
Re: Furnace Reply #11 – December 02, 2022, 03:50:25 am HVAC and the mystery of the missing vacuumWell I connected up a hand vacuum pump to several points on the HVAC vacuum control system and could not determine definitively what had failed but I narrowed it down to the vacuum reservoir and or check valve. Both of those items are not accessible without a lot of work. So I decided to bi-pass them and install a new Dorman 47076 round Reservoir and ford check valve with a new vacuum line running to old vacuum source from the engine in the engine compartment. I found that the information here on LDOF, the LD companion, contributions from Ron B and Larry W were all of Great Help. I used a coat hanger wire to go through the hole that the vacuum line enters the cabin on the passenger side foot well. I then passed it through the firewall by the old reservoir and up into the engine compartment and pulled a new line through to connect to the old vacuum source from the engine manifold. I then connected that new vacuum line to the check valve. The other two ports on the check valve I connected to the new reservoir and the other one to the control vacuum line coming from the console that use to connect to the old reservoir and check valve. I tested with the vacuum pump and it worked and no leaks! From what I could see nothing indicated that rodents were at fault but I did not inspect the old reservoir, check valve or old lines. I did pull out the old line to the old reservoir and it looked good to the connection point with the reservoir. Well I guess we chalk it up to one of Life's many little mysteries? Karen~Liam 98 ~ MB NinA PS - Let me point out that I did not need to remove the dog house to make this repair.Amazon.com: Dorman 47076 Vacuum Storage Canister Compatible with Select...Amazon.com: Motorcraft YG193 Vacuum Checking Switch : Automotive 4 Likes As an Amazon Associate Lazy Daze Owners' Group earns from qualifying purchases.
Re: Furnace Reply #12 – December 02, 2022, 02:19:37 pm Hi Liam; So where did you stash that globular reservoir tank? RonB
Re: Furnace Reply #13 – December 02, 2022, 04:11:19 pm Here's where Chevy mounted the one in my 1985 Twin/King. (I added the decal for fun.) 3 Likes
Re: Furnace Reply #14 – December 04, 2022, 01:45:17 pm Ron B, initially I mounted it to the side wall under the crash detect module with stick on Velcro. But then the trim cover did not fit, so I pulled it down and mounted it to the right side of the trim cover with stick on Velcro once I installed it. I don't know how long that will last. I may upgrade it to a VBD stick on Velcro? I have not made the final installation for the air reserve round tank it may be a work in progress and see how it goes But we now have full vacuum control back! I still have to raise the coach on 2x8 ramps to get under to finish the coach box bolt to frame tightening and also do the cable and clamp to the two Cats("in the yard") under the coach for deterrence! "Our coach is a very very very fine coach with one cat on the cat porch. . . " Karen~Liam 98 ~ MB NinA 1 Likes
Re: Furnace Reply #15 – December 06, 2022, 09:22:04 am There just happens to be a guide to replacing the vacuum line on The Companion. There may be a better way, but this worked for me.The Lazy Daze Companion: Cab AC - Air Flow Cuts Off Under Acceleration 2 Likes
Re: Furnace Reply #16 – December 06, 2022, 04:18:05 pm Thanks for that write up Don. I appreciate the photos which illustrate the fix. Well done.Steve K
Re: Furnace Reply #17 – December 06, 2022, 04:48:40 pm Don, Thank You also I primarily used your write-up with other information from LDOF and YouTube. I had the DogHouse pulled out of the way but that was not necessary. Liam~Karen 98 ~ MB NinA
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Topic: Furnace (Read 717 times)
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