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Old 08-02-2008, 08:06   #1 (permalink)
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Another A/C question

2000 EB Auto-Temp. Rear Air

History:
A/C coming out of front not real cold. Front A/C gets colder when rear A/C is turned on low. It has been that way for a couple years. Obviously more noticeable when car has heat soaked in the sun.

Now:
Front A/C temp 62 degrees on max. Rear A/C much colder. Pressures look ok. Does the pressure run higher than normal with rear A/C? Does this system just need charged?
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Old 08-02-2008, 16:02   #2 (permalink)
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cool Re: Another A/C question

Quote:
Originally Posted by swantzilla View Post
2000 EB Auto-Temp. Rear Air

History:
A/C coming out of front not real cold. Front A/C gets colder when rear A/C is turned on low. It has been that way for a couple years. Obviously more noticeable when car has heat soaked in the sun.

Now:
Front A/C temp 62 degrees on max. Rear A/C much colder. Pressures look ok. Does the pressure run higher than normal with rear A/C? Does this system just need charged?
When you have good A/C in the back and poor A/C in the front, and you have a poor charge, usually it indicates a blockage, usually the orifice tube being blocked. You would see one of the A/C lines freezing up and developing frost (will happen less with the Rear A/C on). The reason the rear A/C works is the rear A/C, although in the same system is seperate, so it will work correctly. Run the Front A/C only and see what the pressures are. The low side pressure will be very low, and when raising the engine RPM to around 1500 rpm the pressure will drop into a vacuum (Negative pressure) and the low side lines will frost. Usual sign of a blockage, more specifically the orrifice tube. If this does not happen and the pressures are normal then you should be looking at a possible temp blend door issue.
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