Why is my AC not very cold?

Try cleaning your air conditioner’s filter and the coils to see if improving the airflow fixes the problem. If there is ice buildup, you’ll need to run the unit with just the fan in order to melt it off. If that doesn’t get the unit blowing cold air again, it could be refrigerant levels are low (see below).

How to detect an evaporative emission control system leak?

P0456 Evaporative Emission Control System Leak Detected (very small leak) P0457 Evaporative Emission Control System Leak Detected (fuel cap loose/off) P1443 Evaporative Emission Control System Control Valve Malfunction P1455 Evaporative Emission Control System Leak Detected (Gross Leak/No Flow)

What is the stopwatch on the Ford EVAP system?

Fig. 3 on page 22 shows a simple example of the integrity process. The CPS and CVS are both closed, sealing the gas vapor system. The FTPS shows −7.0 in.-H 2 O and the stopwatch represents the countdown timer inside the PCM.

What do you need to know about the EVAP system?

A series of valves regulates the flow of air and vapors into the system, the general idea being to route them to the engine to be burned. The EVAP system, to work most effectively, should be completely sealed, including the fuel cap, tubes, valves, canister, and fuel tank.

What happens to the evaporator core when it stops cooling?

In other words, the evaporator core ices up and stop cooling. Then, since no more refrigerant is flowing, the evaporator warms up, the ice melts and you get warm air. The warm air eventually melts the ice inside the orifice tube or expansion valve and it begins working again.

What are the enabling conditions for an EVAP test?

But before the test can begin, many enabling conditions must be met. In addition to the CPS, CVS and FTPS being fully operational, the mass airflow (MAF), intake air temperature (IAT), vehicle speed (VSS) and engine coolant temperature (ECT) sensors, plus a variety of engine management sensors, must be fault-free.

What should the vacuum be in an EVAP system?

First, verify engine idle vacuum is around 21 in. Hg (inches mercury). With the engine running and the purge valve solenoid electrical connector disconnected, check for vacuum in the EVAP system – there should be none. If there is engine vacuum, this means the purge valve is stuck open.

Why is my AC not very cold?