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Need to replace evaporator

Fishermark on Wed April 20, 2011 5:25 PM User is offlineView users profile

Year: 2005
Make: Dodge
Model: Dakota
Engine Size: 3.7
Country of Origin: United States

I am helping my son with his air conditioner in his truck - 2005 Dodge Dakota. We took it to a local ac shop and were told the evaporator needs to be replaced.

I have successfully replaced the ac system in my Chevy van with the help of the forum here, and now need help again!

How do you access the evaporator in this 2005 Dakota? Any specific tips and help? Thanks in advance!

GM Tech on Wed April 20, 2011 5:40 PM User is offline

You remove the dash-(or at least pull it back far enough on passenger side to access HVAC box)-- drop steering wheel down lay it on seat- unbolt all dash bolts and screws- unhook all firewall heater and a/c connections. Once dash is out of the way- then unbolt HVAC box and remove it as a module-- put it on your workbench and take it apart- so that you can pull out the evap. Most folks opt to replace heater core at the same time- since it is only about $40 and you are sooo close to it when doing evap core.

New evap core may need to be "made to fit" I've seen a few Dodges that the replacement evaps are smaller (generic) and need extra insulation to fit air box properly.

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

Fishermark on Wed April 20, 2011 5:43 PM User is offlineView users profile

Thanks for the quick reply. That's what I was afraid of! Not thrilled about removing the dash.... but may give it a shot.

On the Dodge AC connections - what kind are they? Or more specifically, what tool is needed to remove the AC connections?

GM Tech on Wed April 20, 2011 6:08 PM User is offline

You need the "quick disconnect" tool -- it comes in an assortment of usually color- coded plastic garter spring stretchers- found at your local parts store (Autozone, Advanced etc) These connections can come apart in 2 seconds, or 20 minutes-- depending on corrosion issues-- I've gone as far as to cut the evap pipe off to get it apart- since I'm replacing evap anyway....

-------------------------
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

Fishermark on Sat April 23, 2011 10:56 AM User is offlineView users profile

Thanks! When we get to the point of needing further help, I will be sure to post!

Fishermark on Sat April 23, 2011 11:38 AM User is offlineView users profile

Just ordered new evaporator and accumulator from our sponsor. A couple of questions:

The compressor is in good shape, and no debris is evident in the system.... how necessary is it to flush the rest of the system when we replace the evaporator and dryer?

Along that line, how much oil should be used - especially given that there is currently oil in the compressor.

Dougflas on Sat April 23, 2011 5:34 PM User is offline

It is a WAG (wild ass guess) how much oil you lost due to a leak. Without draining the compressor and flushing the entire system, you have no idea how much oil you lost. I myself would add an oz (2 the most) of new oil and not flush the system.

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