Check throttle function for:

Fig 1: Identifying Throttle Function

Courtesy of VOLVO CARS OF NORTH AMERICA.

• bearings and mountings
• spring
• thermostat, chill thermostat (with freeze spray for example)

Throttle position at different temperatures:

A  = ≤+5°C  (preheated air only)

B  = approximately +10°C 

C  = ≥+15°C  (cold air only)