{"model":"mk3","model_name":"MK3 Supra","vehicle":"Toyota Supra A70 (1986.5–1992, 7M-GE / 7M-GTE)","document":"Repair Manual","section":"AC","section_name":"Air Conditioning System","page":19,"pages_in_section":46,"title":"Checking of Refrigeration System with Manifold Gauge (Cont'd)","section_header":"Air Conditioning System — Troubleshooting","ocr_text":"Checking of Refrigeration System with Manifold Gauge (Cont'd)\n\nNo. | Symptom seen in refrigeration system | Probable cause | Diagnosis | Remedy\n\n7 | Vacuum indicated at low pressure side, very low pressure indicated at high pressure side\n\nFrost or dew seen in piping before and after receiver and drier or expansion valve | Refrigerant flow obstructed by moisture or dirt in refrigerant freezing or adhering to expansion valve orifice\n\nRefrigerant flow obstructed by gas leakage from expansion valve or heat sensing tube | Expansion valve orifice clogged\n\nRefrigerant does not flow | Allow to stand for some time and then restart operation to determine if trouble is caused by moisture or dirt.\n\nIf caused by moisture refer to procedures Step 2 on page AC-18.\n\nIf caused by dirt, remove expansion valve and clean off dirt by blowing with air. If unable to remove dirt, replace valve.\n\nVacuum purge and charge new refrigerant to proper amount.\n\nFor gas leakage from heat sensing tube, replace expansion valve.\n\n8 | Pressure too high at low pressure side\nPressure too low at high pressure side | Internal leak in compressor\n\nValve leaking or broken sliding parts (Piston, cylinder, gasket, etc.) broken | Compression defective | Repair or replace compressor\n\nDischarging of Refrigeration System\nEvacuating and Charging of Refrigeration System\n(See Air Conditioning Fundamentals and Repairs Pub. No. 36950E)","image":"https://tsrm.sasquatchvc.com/images/mk3/AC/AC_019.png","url":"https://tsrm.sasquatchvc.com/mk3/tsrm/AC/19","prev":{"page":18,"url":"https://tsrm.sasquatchvc.com/mk3/tsrm/AC/18","api":"https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/18"},"next":{"page":20,"url":"https://tsrm.sasquatchvc.com/mk3/tsrm/AC/20","api":"https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/20"},"section_url":"https://tsrm.sasquatchvc.com/mk3/tsrm/AC","section_api_pages":["https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/1","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/2","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/3","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/4","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/5","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/6","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/7","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/8","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/9","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/10","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/11","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/12","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/13","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/14","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/15","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/16","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/17","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/18","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/19","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/20","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/21","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/22","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/23","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/24","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/25","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/26","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/27","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/28","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/29","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/30","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/31","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/32","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/33","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/34","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/35","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/36","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/37","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/38","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/39","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/40","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/41","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/42","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/43","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/44","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/45","https://tsrm.sasquatchvc.com/api/pages/mk3/tsrm/AC/46"],"note":"OCR transcript of a scanned Toyota factory manual page; verify critical values (torque specs, part numbers) against the image."}