A/C stops blowing when getting highway
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More Turbo
Joined: Feb 2014
Posts: 656
Likes: 1
From: New Braunfels
A/C stops blowing when getting highway
Ok so here's a problem that arose a couple days ago, so I had the ac on "max ac" (I'm about 80% sure it was max ac) I was on the on ramp and as I put my foot to the floor my truck started gaining speed and then about 2-4 seconds later the ac felt like I had the fan switch on lo, so I turned the ac on and off a couple times and then it started blowing like it should when the switch is on hi, I thought nothing of it but over the past couple of days I've noticed that if I'm on the high way and the gas pedal is between 3/4 of the way down and WOT the ac stops blowing (mind you I have the fan switch on hi and ac set to normal ac) if I let off the gas and depress the clutch for 2-3 seconds the ac starts blowing like normal and then I won't have a problem for a bit, so yes this is intermittent the truck in question is rojito (my sig truck) let me know what yall think it is thanks yall
-Dylan
-Dylan
Postmaster
Joined: Aug 2005
Posts: 4,728
Likes: 8
From: Cleveland, TN
You probably have a vacuum leak, the first place to check is the white vacuum line that runs on top of the heater/AC box on the passenger side under the hood.. If you find it broken or falling apart replace the bad section with rubber vacuum line from your local parts store..
BTW This is VERY common......
BTW This is VERY common......
More Turbo
Joined: Jul 2003
Posts: 566
Likes: 5
From: SC
When you have no engine vacuum to the heat/AC controls the default position is "defrost". So when you have vacuum problems, the AC doesn't stop blowing, it just shifts to defrost. With a minor problem it will just shift to defrost when you accelerate pretty hard or climb a hill then revert to where you had it after you've backed out of the throttle about 30 seconds or so.
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