Air Conditioning Quits Blowing Hard at Highway Speeds

[Josh1986]

Here's a dumb thing to check. Be sure your air conditioning condenser is clean and free of debris. You'd be surprised how many ignore the obvious. Crap around the condenser and you cut down on flow and cooling.

Sent from my N9131 using Tapatalk

There are a few bugs, but it's mostly clean.

 

[1955moose]

OK, thought I'd check. Do you have full automatic control, Etac, or a manual basic one.

Sent from my N9131 using Tapatalk

 

[Josh1986]

OK, thought I'd check. Do you have full automatic control, Etac, or a manual basic one.

Sent from my N9131 using Tapatalk

I believe it's just the basic one.

 

[johnboneske]

Here's a dumb thing to check. Be sure your air conditioning condenser is clean and free of debris. You'd be surprised how many ignore the obvious. Crap around the condenser and you cut down on flow and cooling.

Sent from my N9131 using Tapatalk

I agree, but I can tell you mine is clean as it gets, except for a few bugs it sucks up( well bugs fly into it) every now and then...LOL

 

[johnboneske]

OK, thought I'd check. Do you have full automatic control, Etac, or a manual basic one.

Sent from my N9131 using Tapatalk

I have the fully auto HVAC. Dual zone, etc... Like the one pictured

 

[Josh1986]

I have the fully auto HVAC. Dual zone, etc... Like the one pictured

View attachment 25365

We have the manual one with the two knobs. Thanks for the pic!

I'm still doing some exploring by asking a local mechanic or two that I trust that can actually get their hands dirty.

 

[johnboneske]

We have the manual one with the two knobs. Thanks for the pic!

I'm still doing some exploring by asking a local mechanic or two that I trust that can actually get their hands dirty.

please let me know your outcome...

 

[Josh1986]

please let me know your outcome...

Ok. We leave town in two days so I don't think I have time before this trip. I am going to try your trick of switching to defrost if and when it starts acting up.

 

[swagfu]

So this reply is a little late, but I had this problem for a long time and just dealt with it. Then I had someone tell me to replace the check valve. Its inline on a vac hose in the engine bay. It was a $9 part at a dealer and took all of 3 minutes to replace. It still does it once in a while, but honestly, I don't really even notice it that often. And when it does do it, I just turn down how hard its blowing and it comes right back in line. Seems like its a vac issue on most. I even bought a new vac canister, but never installed it since its been working 95% of the time.

 

[Josh1986]

So this reply is a little late, but I had this problem for a long time and just dealt with it. Then I had someone tell me to replace the check valve. Its inline on a vac hose in the engine bay. It was a $9 part at a dealer and took all of 3 minutes to replace. It still does it once in a while, but honestly, I don't really even notice it that often. And when it does do it, I just turn down how hard its blowing and it comes right back in line. Seems like its a vac issue on most. I even bought a new vac canister, but never installed it since its been working 95% of the time.

Good to know. We're still on vacation and took a six hour trip by driving four hours, stopping an hour for lunch, and driving the final three hours.

I don't think it's done it before, but about two hours into the trip water started dripping underneath the glovebox so I'm assuming we might have an overpressure issue too as one of the previous comments suggested. It was warm and humid and recently rained too.

For the last 30 minutes before lunch, it got warm and humid inside the car as the A/Ce couldn't keep up (like usual), but it was blowing cold again with its normal force after stopping about an hour for lunch.

There were no issues for the last leg of the trip and we haven't driven it long enough this week for the A/C the issue to happen.