I'm guessing I have some air trapped in my cooling system as I changed all hoses and refilled system, now heat gauge goes up on long grades and it did not before I changed the hoses.
How do I get the trapped air out if that's what the cause is?
Thanks....... William Rogers....

Wow, this one goes back a ways.

Someone on another forum suggested adding water with the engine running and the defroster on. That seemed to work for me.

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1982 300SD

William,

I've never had trouble with this as long as I filled with the engine running.

If you still have trouble, some thermostat housings have a bleed screw on them, but I think I've seen that on the 124 gas engines not diesels. Failing that, you can just crack the hose a little near the thermostat housing and see if you can bleed it a little.

Good luck,

wow, that question was answered almost 4 years later...lol.

I usually take the upper hose off after filling the system and dump water in there too untill it overflows. Long ago a mb mechanic told me to lift the front end of the car and run the engine untill it burps out the air.

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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350

Removing a temp sensor from the housing while filling should work just as good. Replace once the air is out, crank and run engine while topping off.

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85 300CD
83 300TD
78 240D (daughter)