How does flap control work on a Porsche 928?
Flap Control. This is accomplished by constant heating and cooling, and is monitored by outside and inside temperature sensors. An electric motor (on left side of the air conditioner box or right side for RHD cars) operates the heating flaps (open/closed) depending on the program selected with the control switch.
Do you need ohmmeter for Porsche 928 heating?
Proceed step by step when checking and make sure that each test is performed with the correct tester at the correct test point. A wiring diagram is also provided. Only an ohmmeter and a test lamp are required for testing. The electric part of the air conditioner is supplied with power from term. 15 (ignition lock) via fuse no. 9.
Where is the temperature selection lever on a Porsche 928?
Note: In temperature selection lever position 18 (left stop) there is only (since 1982 models) cooling, no heating — max. cooling. In temperature selection lever position 30 (right stop) there is only heating, no cooling — max. heating.
What kind of engine does a Porsche 928 have?
The belt on the 928 is reputedly the longest toothed belt ever used on a production auto. It drives either two or four overhead camshafts, the oil pump and the water pump, and several other pieces of mechanism. We are not noted for taking it easy on our engines, so it gets to see rapid acceleration, lots of gearshifts, and high RPM operation.
What happens when you open the check valve on a Porsche 928?
As the valve is opened by the cam lobe, the pressure in the pressure chamber (4) increases and closes the check valve (6). A small amount of oil leaks out through the gap (7) thus shortening the hydraulic element by several 1/100 mm depending on oil temperature and camshaft speed.
Where is the preheating line on a Porsche 928?
A preheating line runs for a short distance in the hose for the crankcase vent (24), between the oil separator (14) and air cleaner lower section. The coolant for preheating is taken from the left cylinder head (23) and enters the cooling system again at the thermostat housing.
How much oil does a Porsche 928 have?
The engine 928 has a pressure lubricating system with wet sump and oil cooler. The oil cooler is integrated as a heat exchanger in the car’s radiator. The amount of oil is approx. 6.5 liters. The oil level ts measured with a dipstick and with a warning light on the instrument console.
Where are the ground wires on a Porsche 928?
One is at the top of the “O” in the word Porsche cast into the cam cover — and it may be covered-up by the emissions air injection valve/hose. The second attachment point on the cam cover is more visible and is closer to front of car. Point 10 For later Euro cars, look for ground wires attached to the back of cam gear metal rear covers.