[Healeys] 100 heater motor or switch problem

Michael Oritt michael.oritt at gmail.com
Thu Oct 25 12:33:54 MDT 2018

Thanks for the info.

On Thu, Oct 25, 2018 at 2:28 PM John Harper <ah100register at gmail.com> wrote:

> Michael
> Assuming that you have a standard 100 heater undoing the three clips is
> straight forward. This will expose the back of the rheostat. The wiring
> goes though a small grommet at the top and this often perishes.
> Removing the whole heater: after the hoses are disconnected is by three
> fixings two are at the top front of the vertical bracket: welded onto the
> box cross member. The other one goes through the back of the cross member
> and you have to use a box spanner through a hole on the engine side after
> perhaps removing blanking grommets. Putting this nut back when refitting
> can be a little tricky.
> Best regards
> On Thu, 25 Oct 2018 at 19:03, Michael Oritt <michael.oritt at gmail.com>
> wrote:
>> The fan motor in my heater worked nicely all summer but naturally chose
>> to crap out once cooler weather arrived a few days ago and I'd like some
>> advice from those 100 drivers who have previously removed/remounted their
>> heaters.
>> I have verified that power is getting to the heater lead from the fusebox
>> I installed in the engine compartment, and the green wire disappears into
>> and through the firewall, apparently intact Without disassembling the
>> heater I cannot access the rheostat switch to trace whether it or the motor
>> is the issue and before I pop off the three spring clips that seem to hold
>> the heater faceplate to the rear plate I would like to know that doing so
>> will allow me to get to the heater's innards.
>> Also I would appreciate learning whether reassembly is the reverse of
>> disassembly as those clips, esp. the one at the 12:00 o'clock position, do
>> not look like they will be easy to get back into place with the heater
>> mounted to the firewall, which leads me to my last question: How is the
>> heater unit fixed to and removed from the car should I need to access the
>> fan motor? Aside from one screw going through an ell-bracket at the top of
>> the faceplate I see no other fasteners projecting through the firewall.
>> Thanks in advance--Michael Oritt
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> --
> Best wishes
> John Harper
> AHC UK 100 Register Secretary
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