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Why does my cooling system do that??? #639946 03/14/10 05:06 PM 03/14/10 05:06 PM
Joined: Dec 2004 Posts: 59 Central Illinois M mity225 OP member
mity225 OP member M Joined: Dec 2004 Posts: 59 Central Illinois	This problem seems pretty odd to me. 1986 Dodge D100 truck, manual transmission (OD), with high milage continually fills the overflow bottle with coolant. This thing starts EVERY time I hit the key. Runs so good there can't be anything seriously wrong with it. (OK, once you get past the blue fog on startup, but I'll get those valve stems seals in there someday..) It doesn't run hot, but every time I look, the radiator is down there and the coolant bottle is full! I recycle it to the radiator and away I go again for a month. I originally thought it was blow-by (rings), but then I thought how would that put positive pressure in the coolant? Blow-by would show on the breather, but not this one. I'm thinking head gasket cross-over into the coolant. If it's not that, cracked head maybe? It's been hot once or twice... What else could it be? JK mity225@mchsi.com Always looking for my next project!

Re: Why does my cooling system do that??? [Re: mity225] #639947 03/14/10 05:14 PM 03/14/10 05:14 PM
Joined: Aug 2003 Posts: 475 hobbs, new mexico S SixDRacing mopar
SixDRacing mopar S Joined: Aug 2003 Posts: 475 hobbs, new mexico	replace the radiator cap. use a closded system cap without a pressure relief lever.

Re: Why does my cooling system do that??? [Re: SixDRacing] #639948 03/14/10 05:24 PM 03/14/10 05:24 PM
Joined: Nov 2004 Posts: 9,312 SoCal 68HemiB master
68HemiB master Joined: Nov 2004 Posts: 9,312 SoCal	Quote: replace the radiator cap. use a closded system cap without a pressure relief lever. In a closed system with a properly configured coolant recovery bottle [the hose dumping at the bottom of the bottle], it is normal for some coolant to move from the radiator into the overflow bottle as it expands with heat. What might be at play here is that your radiator cap has failed or is of the wrong design. A lever-less radiator cap designed for this type of system will have a small vacuum relief valve in the center of the seat. Once the expanded coolant cools [and contracts], some amount of coolant will be drawn back into the radiator from the overflow bottle. Down to just a blue car now.

Re: Why does my cooling system do that??? [Re: 68HemiB] #639949 03/14/10 08:27 PM 03/14/10 08:27 PM
Joined: May 2003 Posts: 15,487 Florida S scratchnfotraction I Live Here
scratchnfotraction I Live Here S Joined: May 2003 Posts: 15,487 Florida	good rubber on the cab 16lbs rating little dingy valve thing on the bottom so when it cools off it will suck water back in rad from catch tank check the hose from rad to bottle also,thin weak hose will suck flat and not recover h2o

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