| Pressure (bar) | Saturation Temp (°C) | |----------------|----------------------| | 1.0 | -26.4 | | 1.5 | -18.8 | | 2.0 | -12.2 | | 2.5 | -6.9 | | 3.0 | -2.3 | | 3.5 | 1.7 | | 4.0 | 5.3 | | 5.0 | 11.6 |

| Ambient Temperature (°C) | Low-Pressure (bar) | High-Pressure (bar) | |--------------------------|--------------------|---------------------| | 20°C | 2.2 – 3.0 | 11 – 15 | | 25°C | 2.5 – 3.5 | 13 – 18 | | 30°C | 2.8 – 4.0 | 15 – 22 | | 35°C | 3.2 – 4.5 | 18 – 26 | | 40°C | 3.5 – 5.0 | 22 – 30 | For pure refrigerants, pressure and temperature are directly linked when the refrigerant is in a saturated state (liquid + vapor mix). Example for R134a:

| Ambient Temperature (°C) | Low-Pressure Side (bar) | High-Pressure Side (bar) | Typical Center Vent Temp (°C) | |--------------------------|-------------------------|--------------------------|-------------------------------| | 15°C (59°F) | 1.7 – 2.2 | 10 – 13 | 10 – 12 | | 20°C (68°F) | 2.0 – 2.5 | 12 – 16 | 8 – 10 | | 25°C (77°F) | 2.2 – 2.8 | 13 – 18 | 6 – 8 | | 30°C (86°F) | 2.5 – 3.2 | 15 – 20 | 4 – 7 | | 35°C (95°F) | 2.8 – 3.5 | 18 – 24 | 5 – 8 | | 40°C (104°F) | 3.2 – 4.0 | 22 – 28 | 8 – 12 | Basse pression (côté aspiration) – Haute pression (côté refoulement) 4. Pressure Table for R1234yf (New vehicles, 2017+) R1234yf operates at slightly higher low-side and similar high-side pressures compared to R134a.

| Source | Type | Link / Search Term | |--------|------|--------------------| | Sanden | OEM compressor mfr | “Sanden pressure chart R134a” | | Denso | A/C systems | “Denso A/C diagnostic chart PDF” | | Honeywell | Refrigerant supplier | “Honeywell R1234yf pressure chart” | | A/C Europa (French) | Technical bulletins | “Tableau pression climatisation auto PDF gratuit” | | Automotive forums | DIY compilations | “Auto A/C pressure chart printable PDF” | “Tableau des pressions R134a climatisation automobile PDF” “Fiche diagnostic pression circuit A/C voiture” 11. Conclusion The tableau pression climatisation automobile in PDF format is an essential field guide for any automotive HVAC technician. It enables rapid, accurate diagnosis of undercharge, overcharge, component failures, and refrigerant contamination. When used with a proper manifold gauge set and temperature probes, it eliminates guesswork and reduces repair time by 70% compared to trial-and-error methods.