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Old 08-28-2018, 09:43 PM   #1
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Excessive cabin heat, 2016 Precept

On our recent trip up a Rocky Mountain pass, in 90 degree weather, the Precept pulled well (Banks intake) and the engine was fine, but engine heat, from behind the radiator, was flooding the cabin with 100+ deg heat. There must be gaps into the engine bay.
You have to remove the front seats to get a good look, but snaking around I can see daylight near the A/C tubing, two finger gaps on both sides of the engine cover and a big vent in the passenger footwell. I have lined the engine cover with Dynamat and I'll seal every gap I can reach with metal tape and Dynamat, but I think there are major gaps in the Jayco plywood firewall as it interfaces with the Ford chassis that are out of reach. I didn't notice this extreme hot air before - could something have moved under the cowl?
I don't think that footwell vent comes from the engine. Isn't that the air return into the Ford's cab A/C? Anyone know? Don't want to plug that.
Parked on a windy day, I can feel air moving from under the front.
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Old 08-29-2018, 11:14 AM   #2
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Welcome to the wind tunnel! The "firewall" and I use that term loosly has many open penetrations. On my list for this fall is to remove the seats, dash, carpet and dog house and build it all correctly. While it's all open I will "dress" the wiring and arrange and shorten the air ducts (some of them make loops they are so long) add defroster vents for the passenger and driver's windows, seal the firewall holes and then Dynamat/Hushmat the firewall, floor and doghouse. I will also come up with accessible fasteners for the doghouse so the engine can easily be serviced. I'll also reinstall and fortify the dash bracing. After all is put back together a new infotainment system with a high resolution screen will be installed and the Jensen can hit the trashcan.
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Old 09-03-2018, 08:00 PM   #3
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Is the Jensen a standard size so that something better can be swapped in? The wire-loom for the infotainment system is complex - there are available wires for everything - lots of loose stuff. Label anything you pull off.

My Jensen mapping system, barely a year after purchase, is not supported by the mapping supplies - the model number isn't on their online list. ANother model might work, I suppose.
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Old 09-09-2018, 03:12 PM   #4
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Vicr, please keep us apprised of your progress! Pics would be much appreciated!
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Old 09-09-2018, 05:25 PM   #5
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I will. I'm going to start in a couple of weeks.
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Old 09-11-2018, 01:23 PM   #6
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Howdy Vic.

Hope all is well up north. Still thinking of Quartzite next winter?

Can't wait to see your pics of the mods/improvements on the front area.

Mike
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Old 09-11-2018, 08:17 PM   #7
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Some things fixed, but a bigger problem arises

On the edges of the so-called engine hatch, there are verticle holes (construction gaps) about 3/4" by 4 inches where the hatch doesn't quite fill the gap. One admits behind-the-radiator hot air on my accelerator pedal leg. Spray foam covered them over for now but it's unsightly - will have to peel the rug back and seal with metal tape. But the problem is the Ford Dash A/C has stopped - diagnosis says it's the compressor. VERY hot air fills the vent tubes (the ones that haven't fallen off anyway) and one dumps that air on the passenger's feet. 120 deg according to the thermometer. That's not good news - the engine accessories are very hard to reach either from under of via the screwed-down hatch. Thjats under warranty - let's see if that works.

I follow the seat removal, total plugging up projects with interest. Post pix etc please.

ANyone every service their Ford A/C compressor themselves?
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Old 09-12-2018, 06:13 AM   #8
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I understand from Facebook jayco site there is a recall (termed loosely) on some of the air conditioners. Supposedly the Ford part that turns the air on. I would call jayco CS and ask.
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Old 09-12-2018, 07:58 AM   #9
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Quote:
Originally Posted by hawkster View Post
I understand from Facebook jayco site there is a recall (termed loosely) on some of the air conditioners. Supposedly the Ford part that turns the air on. I would call jayco CS and ask.
Could you provide a link to where you saw that ? I went to Jayco's FB site but did not find that. My pick up/PDI was delayed due to an A C problem on the Ford chassis.
Thanks
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Old 09-12-2018, 10:32 AM   #10
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Quote:
Originally Posted by GCSuper View Post
Could you provide a link to where you saw that ? I went to Jayco's FB site but did not find that. My pick up/PDI was delayed due to an A C problem on the Ford chassis.
Thanks



Go to the FB Jayco Precept and Alante group.
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