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  #1  
Old 04-24-2012, 03:51 PM
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More coolant spew

When my 86 300E idles for 10 minutes, it starts spewing coolant from the overflow tank. Driving around, this doesn't happen. The hose that goes to the thermostat is rock hard and the hose going to the overflow tank is squishy and limp. I replaced the thermostat last week thinking that was the problem, but obviously that was wrong. Could something be plugged and why only when I am idleing in park? And you don't need to say "don't idle your car dumbass".
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  #2  
Old 04-25-2012, 12:02 PM
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Sounds like it's boiling over. check the condition of your radiator cap? If questionable, replace.

Probably has all kinds of air in the system as well.
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  #3  
Old 04-25-2012, 01:09 PM
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x2 on the radiator cap.

Also make sure thermostat is in the housing correctly. Sounds like the system is not flowing through the bypass/radiator and building up backpressure. But I work on diesels, so what do I know?
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  #4  
Old 04-27-2012, 02:12 PM
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How do i get the air out of the system
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  #5  
Old 04-28-2012, 06:33 AM
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Joe, no doubt you realize the spring-loaded side of the thermostat faces into the thermostat housing. Position the thermostat so the air bleed valve is at the highest point ... typically toward the firewall.

It's possible the new thermostat is defective. Hopefully you bought a high quality thermostat - Behr or Wahler.
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  #6  
Old 04-28-2012, 07:55 AM
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I always take and drill a 1/8 hole in thermostat to bleed air better.
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  #7  
Old 04-28-2012, 05:42 PM
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Top off the coolant tank, turn the Heater to full hot, start car with cap on 1st notch, not screwed on all the way, let it warm up- maybe drive it around the block a few times.

Eventually as the thermostat warms up and starts to open the system farts out the bubble, and the water level will drop in recovery tank. Top it off again, and then tighten cap.

Check levels again in a few days and top off if needed. This may go on for a few days.
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Old 04-28-2012, 05:45 PM
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Also check the obvious- your fan / fan clutch is working. I would check the lower hose on the radiator while it's running to see if you have adequate pressure coming out.

There should be a considerable difference in temp between the upper and lower hose. If the lower house is still hot, or has low pressure could be a clogged radiator or simply no airflow thanks to a dead fan.

Temp gauge should read accordingly high as well. However if its puking into the tank it's boiling over and it should be in the "red" zone if that happens.
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  #9  
Old 05-02-2012, 04:23 PM
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I tried what you all suggested but it keeps boiling over. I checked the thermostat it is a Behr brand and it is in correctly. I ran the car for 10 minutes in park with the overflow cap off and some bubbles came out then it boiled over. About 3 quarters worth of a gallon. Possible bad thermostat still? Or should I try to clean the radiator and how do I do that? Also the interior smells like coolant, so I'm guessing bad heater core, could that be the problem?
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  #10  
Old 05-02-2012, 05:01 PM
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yep, heater core. YOu are losing coolant pressure through it, and that's causing your boilover.
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  #11  
Old 05-02-2012, 05:06 PM
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Thanks randy. Do you know of any tutorials on how to replace the heater core. I have done this on a Volvo 240 and a Volvo S80, is there much difference on a 300E?
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Old 05-02-2012, 05:11 PM
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apart from the disassembly of the car pain?

Not that I'm aware of- good luck.
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  #13  
Old 05-02-2012, 05:12 PM
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PS get the system pressure checked as one last step while you are at it- could be a failing HG as well....
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  #14  
Old 05-02-2012, 06:55 PM
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Quote:
Originally Posted by Slow Joe View Post
Thanks randy. Do you know of any tutorials on how to replace the heater core. I have done this on a Volvo 240 and a Volvo S80, is there much difference on a 300E?
Look up evaporator replacement for a W124.
Best be sitting down.....

BTDT

Jim
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Old 05-02-2012, 10:25 PM
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Quote:
Originally Posted by RANDY P View Post
PS get the system pressure checked as one last step while you are at it- could be a failing HG as well....
By HG, do you mean head gasket?
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