Ac stuck on defrost & floor

[silversnake]

Issue started yesterday afternoon Ac went from blowing thru the vents to the defrost shortly after hearing what sounded like..... (a good example would be a napkin being suck into a shop vac). Later that night my blend door failed and was blowing heat from the defrost/floor. Here is what I've done so far

1. Replaced blend door actuator [emoji37]
2.Repaired EATC o rings
3. No leaks as far as I can tell.



Sent from my iPhone using Tapatalk

[justbob]

Check for vacuum leak from the EATC to the vacuum manifold behind the intake.


Sent from my iPhone using Tapatalk

[silversnake]

Check for vacuum leak from the EATC to the vacuum manifold behind the intake.


Sent from my iPhone using Tapatalk



The vacuum reservoir (black box)? Or the small tree like piece with the check valve? I'm not sure what the vacuum manifold looks like. Btw my intake is on the passenger side. What's the best way to find vacuum leaks?


Sent from my iPhone using Tapatalk

[03Merc]

Brake cleaner.


Sent from my iPhone using Tapatalk Pro

[Zack]

The thin black vacuum line usually breaks at the firewall.

[Gerry24]

Go to the boneyard find you an EATC from a newer model and see if its the unit. You can go on LKQ find a u-pick and look at their inventory. The most would be is $30, and if its not the problem return it...

[silversnake]

The thin black vacuum line usually breaks at the firewall.



I removed the EATC vacuum connector ( color lines) to see if the Black vacuum line has vaccum and it does but I'm not sure if it's enough vacuum. I'll trace the line from the firewall once car cools down.


Sent from my iPhone using Tapatalk

[silversnake]

Go to the boneyard find you an EATC from a newer model and see if its the unit. You can go on LKQ find a u-pick and look at their inventory. The most would be is $30, and if its not the problem return it...



I thought it was a bad unit also after issue still existed after changing the o'rings. I tried my repaired unit on my buddy's marauder and everything worked like it should.


Sent from my iPhone using Tapatalk

[silversnake]

I replaced the Ac check valve at the firewall, because I've read somewhere I may go bad. I'm convinced it's a vacuum leak somewhere. I removed the line from the vacuum canister ( black box under hood) expecting to hear the air leaking once I pulled the line and I got nothing. My buddy pulled the same line from his car and you can hear the air escape from the box.


Sent from my iPhone using Tapatalk

[silversnake]

90* but feels 100* due to humidity right now I'm praying for the rain but weather report says 0% chance of that happening.


Sent from my iPhone using Tapatalk

[fastblackmerc]

Need to do more PD instead of replacing parts.

[fastblackmerc]

Check ALL the vacuum lines.

There is a vacuum "tree" mounted to the firewall behind the intake. Start there, tracing each one.

The vacuum tank on the left fender might also have a hole in it.

[silversnake]

Need to do more PD instead of replacing parts.



I had to replace the blend door because that went bad blowing hot air only and after doing the EATC test it showed 025. O'rings I found 2 that were dry and broke as soon as I attempted to remove. Check valve probably didn't need to replace but I had one laying around.


Sent from my iPhone using Tapatalk

[silversnake]

Yesterday I noticed that when I turned the Ac on by pressing (automatic) it would blow from the defrost but when I slow the fan down it started blowing from the vents once it starts blowing from the vents I can increase the fan but once I get on the gas it went back to the defrost and hasn't changed since


Sent from my iPhone using Tapatalk

[fastblackmerc]

Yesterday I noticed that when I turned the Ac on by pressing (automatic) it would blow from the defrost but when I slow the fan down it started blowing from the vents once it starts blowing from the vents I can increase the fan but once I get on the gas it went back to the defrost and hasn't changed since


Sent from my iPhone using Tapatalk

Vacuum leak...... for sure.

[silversnake]

I found this image onlinehttps://uploads.tapatalk-cdn.com/20170512/64b709f506f1337a5a5f7872578827 7c.jpg so my focus would be the black vacuum line and it's vacuum source I assume.


Sent from my iPhone using Tapatalk

[Zack]

It's only one line. 1/8" black plastic. It enters through the firewall above the gas pedal.
It always breaks at or around the grommet
You'll need to remove the wiper cowl.

[silversnake]

It's only one line. 1/8" black plastic. It enters through the firewall above the gas pedal.
It always breaks at or around the grommet
You'll need to remove the wiper cowl.



Ok I'll do that tomorrow and report back my findings.


Sent from my iPhone using Tapatalk

[RF Overlord]

The vacuum source comes from the intake manifold, through the check valve, then to one leg of the "T". The other legs go to the vacuum reservoir on the driver's fender liner, and to the vacuum inlet (#5) on the back of the EATC.

[Turbo4v06]

You forgot to mention that weird sound that sounded like a vacuum cleaner sucked a piece of paper, came from passenger side

[Turbo4v06]

[QUOTE=03Merc;1534572]Brake cleaner.


Tried that, sprayed everything but the black line

[03Merc]

[QUOTE=03Merc;1534572]Brake cleaner.





Tried that, sprayed everything but the black line



That car needs to be submerged in brake cleaner haha.

[silversnake]

You forgot to mention that weird sound that sounded like a vacuum cleaner sucked a piece of paper, came from passenger side



Vent door closing after loosing vacuum.


Sent from my iPhone using Tapatalk

[Turbo4v06]

[QUOTE=Turbo4v06;1534672]



That car needs to be submerged in brake cleaner haha.

Lol you gotta catch it first.

[silversnake]

[QUOTE=03Merc;1534674]



Lol you gotta catch it first.



Bro don't give that loser a platform to stand on


Sent from my iPhone using Tapatalk

[silversnake]

*update* found the break in the linehttps://uploads.tapatalk-cdn.com/20170514/99e0388c46e22292b219dc1ab154be 43.jpg now how do I go about replacing it?


Sent from my iPhone using Tapatalk

[03Merc]

[QUOTE=03Merc;1534674]



Lol you gotta catch it first.



Na, low n slow is the way I go. Haha


Sent from my iPhone using Tapatalk Pro

[silversnake]

Used a vacuum like rubber coupler to test it and it works. Thanks for all the advice and suggestions. Everything works like it should. Going to replace the line.


Sent from my iPhone using Tapatalk

[Gerry24]

That's that Florida heat... Glad you found the suspect... Chive on :beer:

[silversnake]

That's that Florida heat... Glad you found the suspect... Chive on :beer:



Yes sir. A/c in Florida is a Must


Sent from my iPhone using Tapatalk

[sb2463]

I need Help. this item has a small leak the vacuum reservoir (black box)? it is on driver side, inside, above the left tire. Where can I get a new one I looked at Rock auto, no luck. The tire on that side wore a hole in it we fixed the hole still has leak in the maximum position. About 2;RPM we have improved it a lot. Decided to replace the box.

Any help would be great. Hoses are goo etc sb

[fastblackmerc]

Recycle yard.

[RubberCtyRauder]

I need Help. this item has a small leak the vacuum reservoir (black box)? it is on driver side, inside, above the left tire. Where can I get a new one I looked at Rock auto, no luck. The tire on that side wore a hole in it we fixed the hole still has leak in the maximum position. About 2;RPM we have improved it a lot. Decided to replace the box.

Any help would be great. Hoses are goo etc sb

how did the tire rub a hole thru it?

http://www.fordparts.com/Commerce/PartDetail.aspx?n=4zn1NYqy5N35 1HtGwWc9%2fg%3d%3d&id=421843281&m=2&search=true&year=2003&make=Mercury&model=Marauder

[fastblackmerc]

There are some on eBay also.

[sb2463]

Hi thanks for the info. not sure. I was looking for a part number as it causes the Vacuum air, to not keep up with the Max air button. RPM over 2000. Has to be the vac box as all the rest in series has been replaced.

[RF Overlord]

it causes the Vacuum air, to not keep up with the Max air button.Not sure what you mean by "keep up with". All the MAX setting does is turn the temp down to 60°, close the Recirc/Fresh door, and turn up the fan speed.

If you have a leak anywhere in the vacuum supply, you should have the infamous default-to-defrost issue when accelerating or under a heavy load.

Also check the supply line right where it goes through the firewall. Others have found cracks in the line there.

[sb2463]

thank you very much for your help sb