Ray et al.,
With regard to the effect of water pump pressure on heater end tanks: if
there is a heater control valve on the inlet side of the heater and it is
closed, then the pressure seen by the heater is only the low pressure side.
Conclusion: Don't rev the motor to high rpms with the heater on. Also, I
recently overhauled a heater core which, like every one that's been in my
car, was bulged on the ends. The end pieces were designed to be
strengthened with solder attachment in the center as well as around the
edges. However, in fact, the solder joint in the middle is usually left
unsecured which makes the end pieces more susceptible to bulging. A more
careful reassembly could help this problem.
Bob
>In a message dated 97-09-19 08:47:08 EDT, laifman@flash.net (Steve Laifman)
>writes:
>
><< ruce,
>
> You have brought up a very interesting, and here-to-fore unconsidered,
> point. The Tiger radiator cap also limits the maximum system pressure to
> 14 psi to protect the heater from "bulging" into an interference fit in
> it's housing.
>
> >>
>I have run a 17 psi cap for years.......yep the cheap ass heater core endcaps
>do bulge, but they were checked and any questionable joints were re secured
>(in the bulged mode), and no problems have ever developed.
>I am not certain that the above is true for all cars. I had another Tiger
>that popped a seam in the heater core. Again, it was re soldered, and served
>for years.
>BTW.......do you guys take out the heater cores a lot??
>Ray
>
>
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