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AC Blowing Warm

[email protected] on Sun August 05, 2007 3:55 PM User is offline

Year: 92
Make: Dodge
Model: Grand Caravan
Engine Size: 3.3
Refrigerant Type: R134a
Ambient Temp: 80
Pressure Low: 30
Pressure High: 200
Country of Origin: United States

92 caravan started blowing warm air out of vents maybe as of about 1week ago. Compressor in van is original. System was retrofitted to 134a about 5 years ago. My mechanic did it and i don't believe he replaced any parts. The only thing he did was put the adapters on schrader valves. Also about 2 summers ago i lost all my freon they determined that it was the low side schrader valve which was leaking so they just replaced that and has been fine since until now. Compressor sounds like it is engaging AC fan goes on but i am not getting cool air out of the vents it is coming out about 80 degrees. I have gauges and checked pressures with ac on full blast the low side is hanging out about 28 or 30 and high side is sticking around 200. Any ideas what it could be?

bohica2xo on Sun August 05, 2007 4:28 PM User is offline

Probably a blend door issue, since the pressures reflect an operating refrigerant loop. Is the suction line to the compressor cool / cold?

B.

-------------------------
"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

[email protected] on Sun August 05, 2007 4:49 PM User is offline

I believe the low side line does get a little cool and the high side does feel hot i believe so whats the next thing i should check

bohica2xo on Sun August 05, 2007 5:16 PM User is offline

Do you have the manual HVAC control on this vehicle? If so, the temperature control cable may need adjustment or repair.

Can you adjust the vent temperature with the temp control lever on the panel?

You have a variable displacment compressor on this vehicle, and a cool suction line would indicate it is picking up heat from the cabin air.

B.

-------------------------
"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

[email protected] on Sun August 05, 2007 5:58 PM User is offline

yes the controls are manual and when i move from cold to hot heat comes out and when i switch from hot to cold cooler air comes out

bohica2xo on Sun August 05, 2007 9:23 PM User is offline

You should try adjusting the temp control cable first.

1) Set the dash lever to cold setting.

2) Rotate blend door arm counter-clockwise, until it stops. The cable clip should slide along the already extended cable.

If the clip is broken, or weak, it may not stay in place on the cable - and the problem will return. The clip is not too hard to replace.


B.

-------------------------
"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

[email protected] on Sat August 25, 2007 10:59 PM User is offline

I have been watching and playing with the ac very closely and i notice that when i run the front ac by itself i only get a few degrees below the outside temperature but when i turn on my rear ac both the front and back ac comes out very cold. So this is what i have been doing and have yet had a problem with the ac. what would cause the front ac to only work with the back ac on?

Chick on Sat August 25, 2007 11:14 PM User is offlineView users profile

Feel the line going into and out of the drier, should be the same temp..If not, you have a clogged drier. (may have clogges the front expansion valve) Pressures won't be that far off since it's a dual air system..One takes up the slack from the clogged one...Feel the lines to the rear also..Remove the panel behind the driers seat and feel if the suction luine is colder than the front suction line..

Also, since this is a variable displacement compressor, you may want to have the system evacuated and recharged..The compressor trys to compensate for low charge..You can only really do diagnostics on those with a known full charge...

-------------------------
Chick
Email: Chick

---------------------------------------------

Freedoms just another word for nothing left to lose

Edited: Sat August 25, 2007 at 11:15 PM by Chick

[email protected] on Sun September 09, 2007 6:42 PM User is offline

sorry been busy

felt the line on rear and it definitely feels colder then front but after awhile front cools off too.
Any ideas

This problem is not critical but my question is if i continue to run it like this am i doing any damage to the system at all or will the problem get worse?

[email protected] on Wed September 12, 2007 12:35 PM User is offline

nobody has any input?

My only question is am i damaging anything by running the system with the rear ac on since the front does not blow cold in less i turn the rear ac on. Is the problem going to get worse or is there a clog or something which may or will get worse?

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