Quote:
Originally Posted by OnewireAT1
I was wondering with regards to the Heater Control Valve... I gleened that the heater core is normally open without power. This means that hot water is normally flowing through the heater core and could create a always heat scenario.
However, after thinking about this more .. If the car has not been run today .. and it is 75 degrees here, there would NOT initially be hot coolant flowing through the core.. and if this were the only issue then I should have initial AC of some sort and then it would get hot with the car..
Voting : Agreed ? / Disagree ? / Makes no sense?
I was also reading on how some HVAC systems actually have what is called a "Blended vent system" which is control flaps that separate the heating (heater core) from the cooling (Evaporator). Seems like X5 E53's have a lot of flap valves but I am not sure if it is only for the airflow itself OR if it is truly a blended - in my example I mean ..
A flap which must move in order to allow ether of the following two conditions:
1. heater core HEATED air to enter the cabin
OR
2. Evaporator CHILLED air to enter the cabin
As I am writting this.. I am remembering 2 facts, (1) my gauges are showing LOW Freon @ 37PSI (2) the gauges read same low 37PSI on both the LOW side and the HIGH side... the High side should be reading around 145PSI @ my outside ambient temperature of 70F.
This would suggest a bad compressor; however, the low pressure fill port shows full @ 37 to 50PSI .. so for some reason perhaps something is blocking the Freon from filling ?
IDK 
Please feel free to chime in with any additional thoughts or consideration here.
 |
Sounds like you are using one of those hope it get my AC cold in the bottle to add refrigerant to the system. Is the Engine running and the compressor running when you squeeze that trigger? If not that is part of the problem you don't know how to add refrigerant to the system. Engine needs to be running and compressor needs to be running to add refrigerant on the low side into the system. The manifold gauge that you have hookup to the system shows 35 to 37 on both the lowside and high side. That will indicate a low charge. A Static charge should be at least 70. That is with the compressor not running and low side and high side has equalized.
Since you are a noob to the X5, on the center vent there is a thumbwheel that has red dots and blue dots on the wheel. What color dot is showing on the thumbwheel? Is it Red or is it Blue? If it is Blue you have other problem as to why you don't have AC. If it is red that could be your problem. Turn the thumbwheel until you have the maximum number of blue dots showing.