Ha, if you think taking it out was fun, wait until you try getting it back
in.
--
Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the primer red one with chrome wires
on 9/12/05 8:56 PM, James Harwood at james.harwood@sbcglobal.net wrote:
> Dick and Kyle,
> Ah yes - the heater box!!
> In case you haven't done so already:
> 1. Remove the demister tubes from inside the cockpit
> where they insert into the bottom of the air diverter.
> 2. Disconnect the diverter control cable completely at
> the control knob on the dash. Oops - it's a 79 -
> control is on the console? Mine's a '74. You probably
> already have it disconnected.
> 3. Remove top screw from bracket right at the top of
> the fan box in engine bay. All other screws around the
> flange removed?
>
> Pull top of heater box away from the firewall. It may
> be well sealed around the fan output hole and
> firewall.
>
> Jiggle it a bit to try and break the seal lower down
> where the demister tubes went through the firewall.
>
> After a lot of tugging and gentle persuasion, it
> should come out complete with the control cable.
> Remember now, no swearing!
>
> Ask me how I know about this! Mine is out of the car,
> refurbed with uprated matrix and fan motor. Eventually
> it will make it's way back into the car.
>
> The overdrive solenoid I believe takes about 1.7 amps
> when initially energized, then settles down to a lower
> current. Before connecting a supply to it, if you have
> an ohm meter, make sure that it isn't either open
> circuit or short circuit. I can't remeber the exact
> resistance reading. My OD box is sitting on the floor
> - I can check it if you like. If it shows a good
> reading, you can try putting a 3A fuse in line to
> test. The only problem is, you won't see or hear much.
> I understand that late OD solenoids are pretty much
> silent in operation. Check the operation of the
> lockout switch with your meter. For a '79, it should
> only let you engage OD in 4th gear. I had to replace
> the switch on my refurbed unit and mess about with the
> fibre washers to get it to operate correctly.
>
> Good luck!
> James
> '74 MGB
>
>
>
> --- RICHARD BOES <csrb7007@msn.com> wrote:
>
>> Gents,
>>
>> First off, is there some trick to removing the
>> heater core box? I haven't
>> exerted a lot of pressure on it but something must
>> be holding it back. The
>> parts books don't show it clearly
>>
>> Second issue, when we bought this car, the previous
>> owner stated the overdrive
>> didn't work. After removal of the eng/trans, I
>> discovered chaffed wiring,
>> could I run a fused 12 VDC lead to the solenoid as
>> a test? What size fuse do
>> you recommend?
>>
>> As usual, thank you all for the excellent advice,
>> Dick (Dad) & Kyle (Son - 16) Boes
>> '79 Black B (soon to be racing green)
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