Izuzu220le head talk setting cold and hot - Cars & Trucks

I assume you are talking about mercedes c300. Is that happening when you set on auto. What happens when you set temperature to lowest settings? When it blows hot, is it hot or warm? Does ac compressor works when you blow hot air? There could be few possibilities: low freon, faulty temperature sensor in the cabin, faulty ac controller, sticky ac/heater door or faulty door motor

same way as any other over head valve engine
set to inlet .010" hot and exhaust .012" hot
initially set both an extra .002" cold to get it running

Check the coils.

if overfilled cold that is the cause.
if not overfilled, a RAD cap or engine head gasket failure or is overheating or other bad things, (cracked head./block) etc.

make sure the RAD (under cap) is full cold
and side tank set to low.
then see if it does that.
and if the engine gets TOO hot.

My manual shows an 8RC for 70 and 71 and an 18RC for the 72-74

18RC valve clearance HOT IN .008 EX .014 cold spec. .007 .013
Cyl head 72-82 Ft Lbs
Rocker caps 12-17 ft lbs
cam bearing clearance .001-.002
cam endplay .0017-.0066
oil tube 11-16 Ft Lbs

bad heater control switch or resistor.

Sounds like more than one issue. 17 year old Chrysler, so it is not a surprise. Blend door actuator, HVAC power head are possibilities. If this is still powered by vacuum lines, they could have leaks at this age and nothing will work right. This all could require dash removal of various degrees to test and repair.

There are many possible causes for this. A good place to start would be to make sure your radiator fluid is filled up to the cold level when the engine is cold and to the hot level when your engine is hot.

http://www.izook.com/shoptips/valves/valves.htm

Here is the procedure.
They give hot and cold specs.
The hot specs are much larger, and you might have set them when too cold to use the hot specs.

Or you many not have set the crankshaft to TDC and done the right set of valves.
But being overhead cam, you should have easily recognized whether or not the cam was free from pressing on the tappet.

I also do not recommend light oil like 5w-20. I prefer 10w-40 or 20w-50 unless you live in a very cold climate.

OK how hot does it get Boiling and loosing all coolant in header tank and radiator/at what milage from filling to stopping because of overheating??????????????????????
Problems could be blockage in water system (radiator /thermostat in the correct way around/bugs and dust in radiator inner and outer core/water pump faulty (will cause hot top hose and cold bottom of radiator ) or even bottom hot /top cold ..and if all the above is good then your problem is that you have a BLOWN HEAD GASKET and the compression is being forced into the coolant system as the compression is above 110 PSI and can be forced into the coolant area and hot gases cause overheating.....
Let me know how you get on A.S.A.P Ron