2001 Kia Sephia A/C Not Cooling When Car Hits Certain Speed

JALFONSO

MEMBER
2001 KIA SEPHIA
4 CYL
FWD
MANUAL
130,000 MILES

The A/C works fine when driving at lower speeds around town, but when I take it on the freeway and go faster than 60 mph or so the a/c will stop working and just blow regular temp. Air.

Another problem that arises at these speeds is that the engine temp. Gauge will show overheating, although the engine is at normal operating temperature.

Once I drop the car speed below 60, everything returns to normal.

1 Reply

DAVE H

MECHANIC
13,384 POSTS

INSUFFICIENT OR INTERMITTENT COOLING OR NO COOLING
Check A/C system performance. See A/C SYSTEM PERFORMANCE under SYSTEM TESTS. If low-side and high-side pressures are as specified, A/C system is operating properly. If pressures are not as specified, check for correct amount of refrigerant in system. Check for moisture or air in A/C system, refrigerant oil and/or refrigerant leaks, or no refrigerant circulation. Also check for insufficient A/C condenser fan cooling, expansion valve stuck open, or a faulty A/C compressor. Perform A/C system repairs as necessary.