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Old 07-04-2018   #1
Join Date: Apr 2018
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Over Heating

I just bought a 1977 124 Spider. I had to replace heater valve and thought i would replace the thermostat while I'm at it. After replacing thermostat the car runs hot. I called the supplier of the thermostat and was told to check the lower radiator hose and lower radiator. If cold then i had an air pocket. I followed all the instructions for bleeding the air out, to no avail, still running hot.
Anyone have any suggestions for bleeding the air out?
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Old 07-04-2018   #2
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Re: Over Heating

There usually isn't any problem in bleeding the cooling system on a 124 Spider.

You've already checked out the new thermostat in boiling water so hopefully that's ok.

There's a metal pipe inside the expansion tank outlet which can corrode badly and prevent coolant flow to or from the tank. With the radiator cap removed, coolant poured into the tank should run out the expansion tank pipe into the radiator neck. If this isn't the case, investigate further and correct.

Run the engine with the radiator cap removed and the heater valve open- a fast idle will speed things up.

As the engine warms, try giving the lower rad hose an occasional squeeze to displace any air pocket. Keep topping-up the radiator as necessary.

When the electric cooling fan kicks in, wait for it to stop, then top-up the rad for the final time via the expansion tank - this fills the line to the expansion tank. Refit the radiator cap. Top-up the expansion tank to the Max/Full mark (about 1/2 way on the tank) and refit the tank cap.

Don't remove the rad. cap unless the engine is cold. Coolant level checks are usually done at the expansion tank. ( this tank should keep the rad. topped-up and it's line to the rad. needs to be kept full).

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Last edited by F123C; 07-04-2018 at 21:52.
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Old 18-06-2018   #3
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Re: Over Heating

Is the temperature guage indicating high temperature but not quite in the overheating range? If so, it may well be one of the two temperature sending units which is defective. The one closer to the windshield actually indicates the true temperature. The one closer to the front is supposed to alert the driver to a potential problem by making the guage read higher than the true temperature. If that is defective, the guage will read too high but the temperature will be normal. An easy test is to disconnect the sending unit closer to the front. If that is the case, the guage will display a normal operating temperature. Then, you can replace the front sending unit at your convenience.
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