Help: Thermostat
How do I remove the Thermostat from the lower housing? I removed the 3 bolts and the top half of the housing. I pulled up hard on the thermostat with pliers, but it will not move.
I am afraid that I will damage something pulling so hard. I bought a new MB t-stat and o-ring. I in the middle of flushing the coolant and thought I would change the t-stat at this time. Pleeeese help! |
I do not know your model, but will offer this as your description sounds similar to my arrangement.
You removed 3 bolts and lifted off the upper housing cover. You're likely having a tough time pulling out the thermostat because of the thermostat gasket that runs around the circumference of the inner part of the lower housing. This gasket must first be removed. I use a sharply pointed object to gently dig it out. Once removed, the thermostat pulls out easily. |
i had a similar problem on my 190e car.
the thermostat was stuck solid and could not shift it-but as i was replacing it as a preventative measure, and it was not particularly faulty-i left it alone-.now when i next tackle this job, iwill remove the gasket(o ring) as per mike's advice. johne,do keep us posted of the final outcome |
Mike, thanks for the advise.
I will dig the old gasket out as you suggest. Question: Does the new gasket go in the lower housing first? or does the T-stat go in 1st with the gasket on top of it? My guess is the gasket goes first then the t-stat when re-assembling. Oh, the vehicle is an 1994 E320. |
The gasket is slotted in the middle and suspends the thermo..
That's why you have to dig it out and use the new gasket... A little wd helps on the new one... |
Just replaced the t-stat. Thanks for the help!
Observations: After you cut up the old o-ring, you can pull up on the t-stat to remove it. Use an exacto knife to cut across the O-ring. Make sure the little bee bee hole is nearest the firewall. The t-stat goes in the housing first then the O Ring goes on top of the t-stat. Clean bolts threads with wire brush, they have a little build up on them. Torque 3 bolts to 9NM or 7 ft lbs. |
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