I've been looking at all the threads I can find on the HVAC issues (and there are a lot of threads, so excuse me if I missed this) and I don't think it has been definitively addressed:
When starting to throw parts and money and time at resolving the climate control problems, what is the top level troubleshooting protocol to determine whether you need to replace the Aux pump or the heater control valve (or both), or just bleed the system (which still seems to be problematic for the V8-ers)?
Last winter, I got heat only on the drivers side footwell and the windshield (thankfully) except for about 20 minutes after asking the dealership to bleed the system--after which it went back to its usual behavior. I did notice more heat at high RPM's, but it's wasn't anything I could really control. All this indicated to me that this was likely a problem with the coolant system and not something more sinister within the cabin's electronics.
This summer, I removed the pump/valve assembly and back-flushed it as one of the outputs did not shed water when I put a garden hose to the input port. Afterward, both output ports flowed water out relatively evenly and freely.
So now I've now got a new set of characteristics and anticipate that something still is not right. For example, the driver side dash and door vents were full A/C cold prior to this (with the A/C full on cold), but now there is detectible warm air mixed in. I can feel warm air coming from the lower port where the door meets the dash on the drivers side. The passenger side feels full cold so there is a definitive difference.
I also did feel warm air (with the heater full on hot) in the passenger side, and at the dash, so I may have fixed that problem. But maybe caused another....
Anyway, if I knew what the protocol was for when to replace the aux pump as opposed to the control valve, I'd be better able to address the problem myself.
Thanks!
When starting to throw parts and money and time at resolving the climate control problems, what is the top level troubleshooting protocol to determine whether you need to replace the Aux pump or the heater control valve (or both), or just bleed the system (which still seems to be problematic for the V8-ers)?
Last winter, I got heat only on the drivers side footwell and the windshield (thankfully) except for about 20 minutes after asking the dealership to bleed the system--after which it went back to its usual behavior. I did notice more heat at high RPM's, but it's wasn't anything I could really control. All this indicated to me that this was likely a problem with the coolant system and not something more sinister within the cabin's electronics.
This summer, I removed the pump/valve assembly and back-flushed it as one of the outputs did not shed water when I put a garden hose to the input port. Afterward, both output ports flowed water out relatively evenly and freely.
So now I've now got a new set of characteristics and anticipate that something still is not right. For example, the driver side dash and door vents were full A/C cold prior to this (with the A/C full on cold), but now there is detectible warm air mixed in. I can feel warm air coming from the lower port where the door meets the dash on the drivers side. The passenger side feels full cold so there is a definitive difference.
I also did feel warm air (with the heater full on hot) in the passenger side, and at the dash, so I may have fixed that problem. But maybe caused another....
Anyway, if I knew what the protocol was for when to replace the aux pump as opposed to the control valve, I'd be better able to address the problem myself.
Thanks!
Aux pump vs. Control valves vs. bleeding
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