[DeTomaso] heater hose ball cock valve question

[John Bentley]

the reason 2 are required is you don't want hot water in the passenger compartment if a hose breaks or there is a hole in the heater core.  The pressure is essentially the same on both hoses (maybe 10-15 psi anywhere in the cooling system) with some small difference between them to force water to flow through the core.  The faster the engine rpm, the larger the difference.  Its better to think of the heater hoses as supply and return rather than pressure and suction.  Neither hose has any "suction".

John


--- On Mon, 7/25/11, MikeLDrew at aol.com <MikeLDrew at aol.com> wrote:

From: MikeLDrew at aol.com <MikeLDrew at aol.com>
Subject: Re: [DeTomaso] heater hose ball cock valve question
To: boyd411 at gmail.com, detomaso at realbig.com
Date: Monday, July 25, 2011, 9:10 PM


In a message dated 7/25/11 19 57 57, boyd411 at gmail.com writes:


> When placing a ballcock valve in the heater hose at the fire wall do you 
> use
> two ball cock valves (1 for each hose) or only one valve on the heater 
> hose
> going in to the fire wall?
> 

Although only one is strictly necessary (blocking the flow of water into 
the car, not suction back to the engine), tech regulations require two, just 
for added security.

Mike
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