Possible thermostat issue d15
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Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=114684
Printed Date: 15 Sep 2025 at 5:08am
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Topic: Possible thermostat issue d15
Posted By: Tractornewb
Subject: Possible thermostat issue d15
Date Posted: 14 Nov 2015 at 2:46pm
Coolant is boiling over and being lost thru the overflow tube in neck of radiator. Tried replacing the cap did not change. Do you guys think it the thermostat?
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Replies:
Posted By: Tractornewb
Date Posted: 14 Nov 2015 at 3:08pm
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Ok silly me just did some searching and learned I'm not supposed to fill the radiator to the top leave it one to 2 inches below the cap! I'll let somemore overflow and see what happens. Think that's it though...
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Posted By: DougS
Date Posted: 14 Nov 2015 at 4:34pm
It shouldn't be boiling over, regardless. It may expand and go out the overflow, but it shouldn't boil. It might be the thermostat. It might be a head gasket. What is the temperature gauge doing?
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Posted By: Tractornewb
Date Posted: 14 Nov 2015 at 4:43pm
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Doug I stand corrected was not boiling over wrong term I used. The radiator was down an inch or 2 since I bought it. Never overheated never leaked, thought I was doing the right thing by filling to the top,I'm used to newer cars with resivours
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Posted By: DiyDave
Date Posted: 14 Nov 2015 at 5:41pm
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If it still expands out, I'd take a good look for a clogged radiator, much more common problem, than thermostat problems...
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Posted By: Dan73
Date Posted: 14 Nov 2015 at 5:45pm
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I would just say make sure the temp gauge works temp and oil are critical to have or you can easily trash the motor as long as the temp gauge works and reads normal then the issue is just learning how the old system works. Been there done that with my d17 felt stupid when I realized I kept over filling it. If you open the cap and can seen the fins on the inside of the radiator then you have a leak to worry about.
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