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Thread: '93 Sixty Special: Coolant hose valve direction

  1. #1
    DReffects's Avatar
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    '93 Sixty Special: Coolant hose valve direction

    Hey guys,

    so I flushed my cooling system. Unfortunately I removed that T-shaped connector that connects the hoses going from the engine to the heater core and a hose that goes downwards. Later on I found that this t-shaped thingy seems to have a directional flow. One opening is tighter that the rest. Also, there's an arrow printet on. While I own the service manual I did not find any information on what direction that arrow should point.

    Could you please help me out?

    Thanks!

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    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    The hose from the heater core gets attached to the "leg" with the smaller opening.

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    DReffects's Avatar
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    Re: '93 Sixty Special: Coolant hose valve direction

    Thanks

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    amunderdog is offline Cadillac Owners Connoisseur
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    Re: '93 Sixty Special: Coolant hose valve direction

    The arrow points to the heater core

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    DReffects's Avatar
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    Re: '93 Sixty Special: Coolant hose valve direction

    Reinstalled it and it works. thanks again guys.

    what purpose does this valve thingy serve anyway? From the diagram I figure that the water that already ran through the heater core is actually being returned upwards to that valve where the inlet hose is. what gives?!

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    drewsdeville is offline Cadillac Owners Master
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    Re: '93 Sixty Special: Coolant hose valve direction

    It's to lessen pressure drop across the core, created by flow fluctuation from rpm changes - aiding in heater core service life. High rpm/high flow situations without the restrictor will cause exploding heater cores, especially with plastic end tanks. Very popular addition among hot rodders and performance enthusiasts, and if not originally equipped, manufacturers will add them to resolve repeated heater core leak issues.
    Last edited by drewsdeville; 12-09-13 at 09:19 AM.

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    DReffects's Avatar
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    Quote Originally Posted by drewsdeville View Post
    It's to lessen pressure drop across the core, created by flow fluctuation from rpm changes - aiding in heater core service life. High rpm/high flow situations without the restrictor will cause exploding heater cores, especially with plastic end tanks. Very popular addition among hot rodders and performance enthusiasts, and if not originally equipped, manufacturers will add them to resolve repeated heater core leak issues.
    Thanks for the explanation

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    MoistCabbage's Avatar
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    There're plenty of engines that are much higher revving/more performance oriented than the 4.9, that don't use any type of restrictor, and don't have heater core failure issues.

    In the case of the 4.X engines, if you install a T without the restrictor, you will have very little heat. This has been discussed many times.

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    drewsdeville is offline Cadillac Owners Master
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    Re: '93 Sixty Special: Coolant hose valve direction

    Quote Originally Posted by MoistCabbage View Post
    There're plenty of engines that are much higher revving/more performance oriented than the 4.9, that don't use any type of restrictor, and don't have heater core failure issues.
    http://www.latemodelrestoration.com/...low-Restrictor

    http://www.jagsthatrun.com/Pages/Par...-splicers.html

    That's the first few of thousands of search results that all say the same thing. Many vehicle types and manufacturers are represented.


    Coolant flow isn't necessarily a function of RPM or horsepower. Water pump design , pulley diameters, hose and passage size, and other factors are involved. A 4.9 system may flow as much as a Corvette's, and friction coefficients between heater cores will be different. Redline and horsepower are irrelevant to the topic. Its the CHANGE in RPM, stemming from the on/off throttle of everyday driving that enhances pressure drop across the heater core - or any other high friction component in the system. That said, no matter what engine or manufacturer, hot rods and performance cars are drive...differently...than the average, making them sensitive to the issue.
    Quote Originally Posted by MoistCabbage View Post

    In the case of the 4.X engines, if you install a T without the restrictor, you will have very little heat.
    I cant find anything that relates a restrictor to heater core efficiency, except for a handful of repeated, unsupported posts localized to cf.com. That isn't even logical. Applied to a near identical scenario...If you want better radiator efficiency, close the thermostat to reduce flow ?? Seems to me we like to OPEN the t stat and maximize flow for best cooling (read:heat transfer) efficiency

    As long as enough coolant is flowing through the core to maintain its 200 degree temp, heater output will never change for a given outside air temp. If the core drops temp, which can only occur if flow is low (like a clogged core or some other excessive restriction), THEN heater output will suffer.
    Last edited by drewsdeville; 12-10-13 at 08:08 PM.

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    DReffects's Avatar
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    Re: '93 Sixty Special: Coolant hose valve direction

    Quote Originally Posted by drewsdeville View Post
    I cant find anything that relates a restrictor to heater core efficiency, except for a handful of repeated, unsupported posts localized to cf.com. That isn't even logical. Applied to a near identical scenario...If you want better radiator efficiency, close the thermostat to reduce flow ?? Seems to me we like to OPEN the t stat and maximize flow for best cooling (read:heat transfer) efficiency
    That's what I had in mind. I actually was about to install the T-valve with the small opening going to the hose that goes down (which is actually connected to the outlet) in order to MAXIMIZE Water flow to the heater core...

  12. #11
    drewsdeville is offline Cadillac Owners Master
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    Re: '93 Sixty Special: Coolant hose valve direction

    http://www.cadillacforums.com/forums...-problems.html

    This is one of the only posts I can find to support the efficiency argument, and like many other suggestions by this old member, there's a lot wrong here. Not only does he contradict himself, he tries to support it by suggesting the restricted leg gets installed in an alternative location to the factory one ( he has multiple members flipping their t's around). The thread ends with the flipped T failing and a restricted heater core replacement apparently resolving the issue...
    Last edited by drewsdeville; 12-10-13 at 08:08 PM.


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