Timeline for 2007 Chevrolet Tahoe Rear ac not blowing cold
Current License: CC BY-SA 4.0
10 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jun 29 at 12:39 | comment | added | F Dryer | Glad for you not finding any leak. Orifice tubes clogging up are nasty problems with removing refrigerant and opening the system to remove and replace it, followed up with new seals, evacuation, final leak testing before refilling with refrigerant to restore factory cooling. | |
| Jun 28 at 15:49 | comment | added | Carlos | Thanks guys, got it hooked up to gauges. No leak just orfice tube was really dirty. | |
| Jun 27 at 15:33 | comment | added | F Dryer | Let us continue this discussion in chat. | |
| Jun 27 at 13:34 | comment | added | Pᴀᴜʟsᴛᴇʀ2♦ | In this case, if one side (front or back) loses refrigerant, both sides loses refrigerant. If one side is cooling and the other is not, there's still refrigerant and therefore no loss. I'm not doubting your knowledge of how an automotive A/C system works, I'm telling you in this case, if you lose refrigerant, neither side would work at all ... the pressure sensor wouldn't even let the compressor kick on. The OPs description points towards the rear expansion valve being plugged, not a leak. | |
| Jun 27 at 13:05 | comment | added | F Dryer | BTW, how does one separate a failed expansion valve from loss of refrigerant if loss of refrigerant already occurred? Gauges and knowledge of interpreting pressures is necessary. As a rhetorical question, one must know refrigeration fundamentals before understanding cause and effect of a system no longer cooling effectively. | |
| Jun 27 at 13:00 | comment | added | F Dryer | Dual expansion valves for dual evaporator coils. A single compressor with capacity to handle two evaporator coils configured for large interiors with more window area, whether with or without factory tinting, has a larger refrigerant capacity. Very few diyers familiar with refrigeration gauges are capable ot determining failure of expansion valves, loss of refrigerant or compressor failure. I prefer suggesting leak detection first and proceeding with gauge hookups second if leaks are not found before dismantling a system on a guess. Once opened, all refrigeration repair procedures are needed. | |
| Jun 27 at 12:53 | comment | added | Pᴀᴜʟsᴛᴇʀ2♦ | The problem is Chevy Tahoes (To include GMC Yukon, Yukon XL, & Suburban) only have a single source of refrigerant. They share refrigerant front and rear, regardless of separate evaporators. The OP states the front is having a hard time cooling the entire cabin but is still cold, that's because normally the cabin would be cooled by the two evap coils and now is only being cooled by one. It is more likely the expansion valve to the rear is plugged as the OP suggests. | |
| Jun 27 at 0:36 | comment | added | F Dryer | I respectfully disagree and aware that many large suvs and minivans have dual evaporator coils, two separate hvac housings to enable cooling for large interiors powered by one compressor. The op mentioned struggling front cooling and zero cooling in the rear evaporator coil. This strongly suggests loss of refrigerant. | |
| Jun 26 at 22:57 | comment | added | Pᴀᴜʟsᴛᴇʀ2♦ | The rear AC shares the same refrigerant charge as the front. This problem WILL NOT be caused by a leak. If it were leaking in the rear, it wouldn't blow cold up front. If it were leaking enough to cause an issue, the compressor wouldn't even turn on. | |
| Jun 26 at 21:02 | history | answered | F Dryer | CC BY-SA 4.0 |