AC acting funny
Thread Starter
|
5th Wheeling
Joined: Jan 2025
Posts: 45
Likes: 2
AC acting funny
95 f150 AC is being weird. last year I figured out that changing the check valve will fix the problem of the ac/heater blowing through the defrost vents. And earlier this year I have been trying to clear codes and realized one was a vacuum leak problem, and had multiple lines broke and I put all new lines under the hood and even the 2 vacuum lines that run into the cab. The only ones I didn't replace are the ones under the dash and I have looked at them they still fill brand new. Well last week I had the ac start blowing through defrost again and I put another check valve on it and its working but then its not working at the same time. So if its already on ac when I start driving I have no problems with it but if I am already up to speed and switch on the ac then it blows through defrost until I let off gas letting it turn on. And after it turns on it works like normal. I have never had to let off the gas to get it to turn on before but after it does turn on it works fine. Any ideas?
Thread Starter
|
5th Wheeling
Joined: Jan 2025
Posts: 45
Likes: 2
Yes the vacuum reservoir is about 2 years old I forgot to mention that, Its a new plastic one from lMC trucks. I am not sure how to check that though?
Lead Driver
Joined: Sep 2002
Posts: 9,540
Likes: 2,032
From: North Texas
When chasing a vac leak potentially at the HVAC, start at the vac source. Guessing your gas engine as F150. Verify no leaks there. Check the line from vac tree out to HVAC.
It should run to a check valve, hose to the reservoir off check valve, and another hose to the cabin for actuation of the vac pods.
My '88 had a cracked line from vac tree to the check valve. Always inspect by hand and eye first. If in doubt of the source, block off items and work your way out.
It should run to a check valve, hose to the reservoir off check valve, and another hose to the cabin for actuation of the vac pods.
My '88 had a cracked line from vac tree to the check valve. Always inspect by hand and eye first. If in doubt of the source, block off items and work your way out.
Trending Topics
Thread Starter
|
5th Wheeling
Joined: Jan 2025
Posts: 45
Likes: 2
When chasing a vac leak potentially at the HVAC, start at the vac source. Guessing your gas engine as F150. Verify no leaks there. Check the line from vac tree out to HVAC.
It should run to a check valve, hose to the reservoir off check valve, and another hose to the cabin for actuation of the vac pods.
My '88 had a cracked line from vac tree to the check valve. Always inspect by hand and eye first. If in doubt of the source, block off items and work your way out.
It should run to a check valve, hose to the reservoir off check valve, and another hose to the cabin for actuation of the vac pods.
My '88 had a cracked line from vac tree to the check valve. Always inspect by hand and eye first. If in doubt of the source, block off items and work your way out.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
Fleet Owner
Joined: Oct 2005
Posts: 20,786
Likes: 1,751
From: Kentucky
Other lines removed, the engine is off.
Thread Starter
|
5th Wheeling
Joined: Jan 2025
Posts: 45
Likes: 2
So I tested that this weekend and it seems like the reservoir is fine I think and I looked at the lines again replaced the ones that have to do with the ac again and its still the same. I'm starting to believe that the check valve pack of 2 I ordered were just cheap and back imma go to Napa and get one. When I had this problem before all I did was go to Napa get that check valve and it worked perfectly until now.
Thread Starter
|
5th Wheeling
Joined: Jan 2025
Posts: 45
Likes: 2
So I went to Napa and just got a check valve from them instead of a cheap one offline and AC is working perfectly the cheap ones offline were not made worth a crap. Lesson learned thank yall though!
Hotshot
Joined: Jul 2020
Posts: 10,471
Likes: 2,633
From: Near Salt Lake City
So I tested that this weekend and it seems like the reservoir is fine I think and I looked at the lines again replaced the ones that have to do with the ac again and its still the same. I'm starting to believe that the check valve pack of 2 I ordered were just cheap and back imma go to Napa and get one. When I had this problem before all I did was go to Napa get that check valve and it worked perfectly until now.
You got a bogus valve
I get them 3 or 4 at a time from the junkyard
The factory Ford ones last about forever
Thread
Thread Starter
Forum
Replies
Last Post
White95PSD
1994.5 - 1997 7.3L Power Stroke Diesel
6
Aug 8, 2021 12:29 PM
Jim40216
1987 - 1996 F150 & Larger F-Series Trucks
2
Jul 13, 2017 03:04 PM
85F350IDI
1987 - 1996 F150 & Larger F-Series Trucks
5
Sep 6, 2015 11:16 PM
Jack01
1987 - 1996 F150 & Larger F-Series Trucks
1
Aug 30, 2005 09:02 PM