2000 durango front vents hot, rear ac cold? help...

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jo - 28 May 2008 18:03 GMT

Our 2000 durango is blowing hot air from the front vents and cold air from
the rear overhead ac vents when the truck's air conditioning system is
turned on. The compressor clutch engages. the metal tubes/lines under the
hood are both 'hot' to the touch. what could be the problem? plugged lines
into the front condensor? non functioning or stuck vent actuator door or
motor? any suggestions would be appreciated!

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maxpower - 28 May 2008 20:47 GMT

> Our 2000 durango is blowing hot air from the front vents and cold air from
> the rear overhead ac vents when the truck's air conditioning system is
> turned on. The compressor clutch engages. the metal tubes/lines under the
> hood are both 'hot' to the touch. what could be the problem? plugged lines
> into the front condensor? non functioning or stuck vent actuator door or
> motor? any suggestions would be appreciated!

The first thing to check would be the proper charge of r-134

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jo - 30 May 2008 00:05 GMT

I took the truck into a shop and had them connect it to an ac testing unit.
the shop said the system was properly charged and the compressor was bad.
they recommemended replacing the compressor, dryer, expansion valve, and
engine cooling fan clutch...... did not seem to make sense to me, since the
rear ac blows cold.... so I posted here for other ideas / suggestions...

someone else mentioned checking the blend door or actuator.... any idea on
where they are and how to access them? How would I check them?

>> Our 2000 durango is blowing hot air from the front vents and cold air
>> from
[quoted text clipped - 7 lines]
>
> The first thing to check would be the proper charge of r-134

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maxpower - 30 May 2008 02:00 GMT

> I took the truck into a shop and had them connect it to an ac testing unit.
> the shop said the system was properly charged and the compressor was bad.
[quoted text clipped - 16 lines]
> >
> > The first thing to check would be the proper charge of r-134

If both hoses coming off the compressor are hot how can the a/c be
cold??????? the low side of the compressor should be cold and the high side
should be hot.you said both hoses are hot?

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jo - 30 May 2008 04:14 GMT

>> I took the truck into a shop and had them connect it to an ac testing
> unit.
[quoted text clipped - 26 lines]
> side
> should be hot.you said both hoses are hot?

Very good question. I'm not sure why the metal hoses feel hot to the touch,
yet the rear ac unit in the rear is blowing cold air. There is a "T"
junction near the truck's firewall (on engine side) and the metal pipes to
the rear drop down to the frame and run aft to the door frame and then up to
the rear ac unit.

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maxpower - 30 May 2008 09:47 GMT

> >> I took the truck into a shop and had them connect it to an ac testing
> > unit.
[quoted text clipped - 32 lines]
> the rear drop down to the frame and run aft to the door frame and then up to
> the rear ac unit.

either way a low charge will cause thiis problem

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jo - 30 May 2008 23:54 GMT

>> >> I took the truck into a shop and had them connect it to an ac testing
>> > unit.
[quoted text clipped - 46 lines]
>
> either way a low charge will cause thiis problem

Thank you for the reply, please forgive my ignorance. Wouldn't a low charge
cause both front and rear to blow warm? why would both pipes be hot and yet
the rear still blowing cold. It is beyond my simple understanding... which
is simply... one cold pipe moves cold freon to the coils, fans blow air over
the coils to cool the air, the warm freon returns to the compressor after
going past the coils near the radiator.... so if both pipes are hot, why
would one set of coils be cooling the air?

could there be a blockage in the pipes near the front set of coils, or bad
blend doors / actuator motors?

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