Renault 19 with gas and without heating

Hello, I have an R19 system with compressed natural gas, and since it was installed, the heating hasn't worked. It's not blowing hot air; the fan is running, but the air isn't hot. I also noticed a cut hose. My question is, do you have the water circulation system diagram for the R19 system so I can see where each hose connects? Thank you.

Hi Lucas, what they did at the garage where they installed your compressed natural gas (CNG) system was use the car's heating circuit to prevent the gas regulator from freezing (that's why you saw the mess in the pipes).

Like LPG, when compressed natural gas loses pressure rapidly in the regulator, it reaches temperatures between -30°C and -78°C. When the regulator gets so cold, the diaphragm freezes and starts to malfunction, creating frost. The gas itself can even leak into the engine as a liquid, causing a poor fuel mixture and engine failure.

To prevent the regulator from freezing and all these problems, they divert hot water from the engine to the regulator. This is beneficial for the engine because it lowers the temperature by about 10°C to 15°C, so even if you're stuck in traffic, the cooling fans are less likely to kick in. It's also good for the regulator because the hot water prevents it from freezing and causing system failure.

However, diverting hot water from the engine shouldn't disable the car's heating system, so you'd need to take it to a garage and explain the problem so they can make the necessary modifications to the circuit to allow the regulator to heat up without affecting the heating.

Best regards.

Nothing more to say the teacher I already speak, tell him to go the hose to pass on both sides and have heating again, Hojo with the quality of the hoses in this case are very important.