Greetings from Phoenix (Where it is already 90 degrees)

My 98 Vette has an A/C issue.

When the A/C is on, the driver's side blows cold, but the passenger side blows hot.

FROM THE FORUM I KNOW THAT IT IS NOT A R134 ISSUE, OR THE SYMPTOMS WOULD BE REVERSED. (cold passenger/Hot Driver)

The dealer told me the passenger side actuator was bad.

MY DIC doesn't read any codes.

Do YOU think it's the actuator, or a Vacuum Line?

Would either problem present any other symptoms I could check? (ie, Hissing noise/No Cruise Control/Noise coming from right side???)

Thanks in advance for your help (And not telling me it's an R134 issue)

 

I believe it would be safe to say it is an actuator,only if you know for
certain all the modes work properly.

 

HEY THANKS jirasvet!

What an incredibly easy (and embarrassingly obvious) solution.

I checked the different settings and the air came out where it was suppose too (Just the wrong temperature on the passenger side)

 

Glad to have helped
Check this link out about reindexing the actuator.
http://forums.corvetteforum.com/show....php?t=1561772

or if you don't feel comfortable you can always by a new one
supposedly the new ones fix this problem

 

Daryl and jirasvet,
I have a '98 Vert with the pass side cold and drivers side somewhat warmer. This started at the end of last summer. I have no codes and have reset the actuators. I have searched and followed lots of threads with no help for my problem.

Daryl, in your first post you say you have learned my symptoms indicate an R134 issue. If it is an issue of the system being low on refrigerant, will it still make the pass side cold?

Can you explain or provide a link? I am confused.

Doug

 

Pull the DIC codes. If it has codes, its usually an actuator. If no codes and vent mixer doesn't work (fan high, very little air out of vents) its usually the vacuum line on the back of the intake @ map sensor.

If it's neither, there might still be a DIC code to steer you in the right direction.

 

Changed search terms and found this answer to my own question...thanks go to BC and bh.

Quote:
Originally Posted by byronhunter
Let me try to explain in a few words. I found out the hard way. When charge refrig is low, the side of the evap closest to the inlet is colder than the side closest to the outlet. With a dual system, the pass side is fed by the half of the evap that is closest to the inlet, so driver side gets fed by the half cosest to the outlet. Someone else should chime in and agree or disagree with my theroy.


100% Correct! You posted a few minutes before I did and I was going to explain it in a similar way! The length of the cooling coil tubing (Evaporator) , the size of the expansion orifice and the correct operating pressure of the system allows the liquid R-134a sprayed into the evaporator tubing to remain a liquid spray long enough to absorb heat throughout the evaporator coil (passenger & drivers side) when the system is at all the correct parameters.

When the pressure and R-134a is low, the sprayed R-134a runs out of heat absorbing capacity somewhere in the middle of the evaporator, (leaving the passengers side warmer than the drivers side) and the liquid R-134a is transfered completely to a gas which cant absorb any more heat from the cooling coil tubing.

Thats my theory and I'm sticking to it!

 

Here are a couple of posts that support the "Low on R134" Theory

http://forums.corvetteforum.com/show...ighlight=r-134

http://forums.corvetteforum.com/show...ighlight=r-134

Here is a link to a VERY helpful writeup on how to replace your passenger side Actuator
http://forums.corvetteforum.com/show....php?t=1561772