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Old 07-28-2015, 10:03 AM
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2005 Jeep grand cherokee 4.7 Weird air Conditioner Problem

I have a 2005 Jeep grand cherokee 4.7 it was sitting for a few months and now when i turn the Ac on the compressor Kicks in 1 line gets cold the other Gets HOT. I get no cool Air if the refrigerant was low wouldn't the compressor kick on and off? It literally Feels like the heat is on at the same time the ac is on that's how hot it is. Is there something that Cuts off the heater core when the ac is turned on like a valve? when i turn the heat and ac off and just the blower is on i still get Hot air even at night when its cool out.

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  #2  
Old 07-28-2015, 11:10 AM
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Re: 2005 Jeep grand cherokee 4.7 Weird air Conditioner Problem

The way the system works, the belt-driven compressor compresses the fluid, and this heats it up. The hot fluid then goes to the condenser located in front of your radiator and releases the heat into the atmosphere. The fluid then passes through a small orifice to release the pressure, which in turn drops the temperature. The fluid (now a vapor) passes through the evaporator in the cabin, which absorbs heat (think of it as releasing cold), then the fluid returns to the compressor.

So it's normal to have a hot line and a cold line.

What's not normal is for hot and cold to be in the evaporator at the same time, unless you have defrost mode on somehow. What that does is take hot radiator fluid from the engine cooling system and circulate it through a coil, usually a second circuit in the evaporator. So check the operation of the valve in the engine cooling system.

If the compressor isn't cycling, the most common problem is that the AC fluid leaked out. A service tech can test the system pressure to see if this is the case. Usually this is due to an O-ring drying out. If so the technician should change out all the O-rings in the system (there should be 6, three different sizes), evacuate the system with a vacuum pump and re-charge it with two or three cans of fluid.
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Old 07-28-2015, 11:28 AM
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Re: 2005 Jeep grand cherokee 4.7 Weird air Conditioner Problem

the compressor kicks in and stays on so i dont think its low on refrigerant
you said

So check the operation of the valve in the engine cooling system.

Where is this located?
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Old 07-28-2015, 11:42 AM
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Re: 2005 Jeep grand cherokee 4.7 Weird air Conditioner Problem

The compressor won't cycle off unless the sensor in the evaporator gets cold. So it could be low on fluid, and never get cold.

I don't have a 2005 Jeep so don't know where the valve is. There should be two 1/2", 5/8" or 3/4" heater hoses routed to-from the firewall. The valve is usually located on one of these hoses, in the engine bay close to the firewall. There should be a lever on the valve, usually operated by a vacuum motor. See if the lever changes position with defrost on-off, and heat on-off.

You can also check the operation by clamping off one of the hoses with vice grips. Pad the jaws with layers of tape so you don't damage the hose. This cuts off the circulation like the closed valve should be doing.
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Old 07-28-2015, 11:58 AM
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Re: 2005 Jeep grand cherokee 4.7 Weird air Conditioner Problem

OK i guess i will have to have the pressure checked in the lines and the other thing i noticed is the Accumulator Suppose to be COld or hot? mine appears to get hot on my other jeep it gets cold?
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Old 07-28-2015, 12:14 PM
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Re: 2005 Jeep grand cherokee 4.7 Weird air Conditioner Problem

On jeeps the evaporator and heater core are separate parts in the HVAC housing. Air coming from the blower motor, allways passes through the evaporator, if you are asking for cold air or not. Hot air is a different story. There is one blend door (or two for dual zone) , which will bypass all air around the heater core (when asking for cool air), lets all air pass through the heater core (when asking for hot air) or any position in between ( mixing some cold bypass air with some heated air from the core).
So it seems that you have a problem with the blend door, causing continuous air passing through the heater core, while in cold position the blend door should close the air flow through the heater core and bypass it.
Indeed, with a low precharge, the compressor will cycle on/off rapidly.
I can be wrong regarding the WK, but as far as i know, there is no shutoff valve in the heatercore lines, coolant just allways flows through the heater core.
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Old 07-28-2015, 12:50 PM
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Re: 2005 Jeep grand cherokee 4.7 Weird air Conditioner Problem

Quote:
Originally Posted by Frango100 View Post
On jeeps the evaporator and heater core are separate parts in the HVAC housing. Air coming from the blower motor, allways passes through the evaporator, if you are asking for cold air or not. Hot air is a different story. There is one blend door (or two for dual zone) , which will bypass all air around the heater core (when asking for cool air), lets all air pass through the heater core (when asking for hot air) or any position in between ( mixing some cold bypass air with some heated air from the core).
So it seems that you have a problem with the blend door, causing continuous air passing through the heater core, while in cold position the blend door should close the air flow through the heater core and bypass it.
Indeed, with a low precharge, the compressor will cycle on/off rapidly.
I can be wrong regarding the WK, but as far as i know, there is no shutoff valve in the heatercore lines, coolant just allways flows through the heater core.

So if i Bypass the heater core or clamp the in hose that goes into my heater core i should technically get cold air correct? i just dont want to tear apart stuff unless i definitely know its the blend door.
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Old 07-28-2015, 01:01 PM
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Re: 2005 Jeep grand cherokee 4.7 Weird air Conditioner Problem

Yes, if you clamp one of the heater core hoses, you will get cold air.

---------- Post added at 02:01 PM ---------- Previous post was at 02:00 PM ----------

Is your jeep dual zone, or single?
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Old 07-28-2015, 01:09 PM
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Re: 2005 Jeep grand cherokee 4.7 Weird air Conditioner Problem

Single Zone and i will clamp one of the hoses and see if it works when it cools down motor is to hot at the moment
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Old 07-28-2015, 04:39 PM
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Re: 2005 Jeep grand cherokee 4.7 Weird air Conditioner Problem

Ok so here is what i did I bypassed the heater core Temp outside is 90f
With the ac off just blowing i get 100f blowing out the vents. When i turn the ac on it goes down to 70f but thats as far as it goes. now when i hook the Heater Core back up everything off just the blower is on i get 120f coming out the vents.. when i turn the ac on i get it down to 100f i still think i need to re charge the ac but i also think i have a blend door issue where is the one that blocks off the heater core located does anyone have a Diagram?

what do you guys think?
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Old 07-28-2015, 06:18 PM
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Re: 2005 Jeep grand cherokee 4.7 Weird air Conditioner Problem

Quote:
Originally Posted by Frango100 View Post
Yes, if you clamp one of the heater core hoses, you will get cold air.

---------- Post added at 02:01 PM ---------- Previous post was at 02:00 PM ----------

Is your jeep dual zone, or single?

OK so when i turn the Dial To hot and Cold None of these move here is a pic under my Dash
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Old 07-28-2015, 07:11 PM
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Re: 2005 Jeep grand cherokee 4.7 Weird air Conditioner Problem

In the bus heading home now. If nobody responds your question before i get home, then i will see if i can get a good drawing from the manual.
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