No air out of vents?

[jacques1543]

I have a 2004 Lexington grand touring Class C. With a Ford E450 .
When I drivecfor about 30 to 40 minutes the AC/ Heater stops sending air through any of the vents: floor/ defrost... everything stops wether I am using the AC orctge heater.
I checked for a vacuum leak .. found a small one and fixed it ... still happens... replaced the blower motor... no change.
When it happens I can hear the blower working really hard but. I air comes out of the vents.
When I do stop after running for that length of time there is a lot if water leaking from under the engine.... any one else ever had this issue?

[NoviBill]

Only a guess, but sounds like a vacuum line issue. A quick search found this: Ford e-450 dash air issue -here is the fix

-Good Luck!

[jacques1543]

Thanks for the reply but we checked for a vacuum leak.. found a small one and fixed it but it still happens.
The ford manual says if it’s a vacuum leak the vents will default to defrost but in our case even the defrost does not work?
Frustrating!

[kenandterry]

Your advantage with your A/C problem is that with the Lexington model, the “automotive” E450 part of your RV is a REAL vehicle that any FORD dealership should know how to troubleshoot.

If you had an F53 chassis, you’d hear all kinds of excuses about what part is FORD, what part is FOREST RIVER and on and on.

[dontay]

Sounds to me like the inside part (evaporator?) is freezing up. I think it is caused by low freon but as said above any dealership or auto a/c shop can fix. The reason for all the water draining is the ice melting.
I had really good luck on my Jeep with a recharge kit I picked up at an auto parts store. It uses a gauge so it isn't like the old days where you just dumped in a can of freon. My repair lasted for two years and then I went to a shop and got a new compressor.