Just replaced my evaporator in my 95 f350. Figured I'd put up some helpful pics in the beginning of this summer season. There were a couple bolts that took me a minute to get. I used window foam insulation to help seal everything up.

Assuming you can take off the one or 2 things that get you to the actual evap box...And my mylar insulation stuff disintegrated.

5/16 (8 bolts) on a 1/4" drive ratchet with an extension needed at some points. You need an 11mm (1 bolt inside cab and 1 nut in engine bay)

There's a little vacuum box you'll need to take off IF you want to be able to just slip the outside cover of evap off without deconstructing the blower box. One bolt top then one on bottom. Feel around for it. I had to superman/plank to get to it and 2 others. Then again, I'm only 5'7...

Random Vacuum box bolts. One thing i've noticed, this box gets exceptionally hot during operating of the vehicle. It only has one opening which is where vacuum hose hooks up so it holds heat and can't vent it. I was thinking about relocating it as it makes a big hot spot on the side of the box. Anyway.


4 of 8 cover bolts shown, top and sides


2 of 8 bolts, bottom..these are a reach


If you can't find the double stacked 11mm firewall-side nuts then stop and ponder why you're attempting this! This is the 11mm head bolt. This is inside passenger footwell, showing the grommet where bolt with 11mm head inserts and threads into evap cover

Crappy pic, but left-center of pic shows insertion point of bolt from inside cab. This mates up with bottom tab on cover


Here's the weather tape I used. I went with 1/4" thick so it would compress easy. You'll add some to cover, and some to edge of climate box itself.

Couple action shots of weather tape. Be sure to wrap the inlet cutouts for evap. Not only is it a place where heat can get in, but it will help secure evaporator even more. Sorry for out of focus pic of inlet cutouts




Super important so the weather tape stays nicely. Punch your bolt holes out first. I pushed a bolt thru, and just ran a utility knife around tip, and that made perfect holes.

 

nice pics.Going to be doing this in the near future, except will be trying to get a 95 evaporator to fit in a 93 box.Keeping my fingers crossed

 

No difference between the 2

 

Thanks, good thread.

Almost all from the engine compartment? I hate working under the dashboard.

Did you have documentation to help you?

 

None. Hence the write-up. Pretty sparse info out there.

99% engine bay. The part inside the truck i could do standing with my lift.

I've done one in a 97 Wrangler and an 08. My 97 took me 8 hours. The 08 took 3 days. Entire jeep had to be deconstructed down to the firewall. Including console. Main engine harness. It's the most insane repair job I've ever done.

Needless to say, my f350 was an absolute joy compared to those lol. I could do the evap again in under an hour easy.

 

Sometimes the parts diagram is golden but this one is clear as mud. For my 1991 F250.

 

Knowing what I know now, I can see how it's only slightly different. But yeah, not the best reference because it doesn't show any bolt locations.

Also, there's so much shredded foam over time.

Also, that vacuum box part 19A566 is literally an unvented heating pad on the side of the box, plus it's on the climate box side of the air that blows over evaporator. It was almost to hot to touch the other day when I was checking pressures after a long drive. I guarantee it's worth a few degreees of temperature.

Side note: I've never seen so many vacuum lines and charcoal canister lines in any vehicle as on this f350.

 

What causes the vacuum box to become hot?

I am suddenly interested because for as long as I've had it, my 93 F150 has blown slightly warm air on the vent setting with the temp all the way down. About ten years ago I installed a valve in the coolant line but that didn't help. Maybe this vacuum box is the reason.

 

That vacuum box isn't the cause of your warm air. I was merely making the observation that it could be responsible for a slight rise (a few degrees) of temperature. Maybe not even noticeable.

It gets hot from engine heat, and it's fully enclosed with only one vacuum, or vent line. It's got no means of a way to vent itself.

Are you talking about getting warm air when AC is on, or just vent? Because cool vent is merely fresh air with the blend door blocking the heater core side. Unless it's winter, you're getting warm air out of there because you're getting the engine bay's residual heat.