when the car is still it blows heat, when driving the a/c works fine. there is a loud ticking under the hood when the a/c is on. locally no one will look at it, i'm about 100 miles from merc dealar.

any advice.
Brian

__________________
Brian
1999 CLK430

This sounds like the AUX cooling fans are not running = A/C head pressure and temperature rise above safe levels = safety switches turn off the compressor until pressure/temperature drops = more air flow with the car moving.



Have a great day.

__________________
ASE Master Mechanic
asemastermechanic@juno.com

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Vehicle build.
Fleet Durability
Technical Quality Auditor.
Automotive Technical Writer

1985 300SD
1983 300D
1984 190D
2003 Volvo V70
2002 Honda Civic

https://www.boldegoist.com/