Chicagoland MG Club
Chicagoland MG Club

Chicagoland MG Club: Driveline
Back to Archives

Submit an article

Cover
Intro & Club Officers
The Steering Column
NAMGAR affilliation
March Meeting Rept
MG re-enters N.A.
Go Brit Baby, Tech Ses
The Rally Corner
Spring Tune Up Party
Dues Deadbeats
Swap Meet Recap
Website Update
March Tech Sessions
Spring Chicken Rally
Regalia Items Available
Regalia Order Form
Just a Simple Wrench
Mo. Endurance Rally
MG 2001 MG Odyssey
Defrosters
Classifieds
Coming Events
Back Cover

  Chicagoland MG Club:Driveline
Defrosters
by Mike Olsen

During some of the warmer days in March I took my MGB out for a ride. It was nice to get into the drivers seat again. There was a small problem however, the defrosters didnít work very well. They didnít do much all. I had to use a towel to clean off the inside of the windshield.

Utilizing my most common type of trouble shooting (throwing it against the wall to see what sticks) I removed the fan motor and rebuilt it. I thought if I had more air flow I would have more defroster action. This did increase the amount of air but had little affect on defroster function.

At the club swap meet I had picked up a heater valve and decided this would be the next correction to be made to the system.

The heater hose had felt warm but not hot so I guessed it must be a bad design. I modified the heater valve by disassembling and placing washers under the valve cup. This is done to open the valve all the way. Most valves are closed at the half way point on the heat control knob and this modification lets the valve open fully.

Then I removed the old valve and looked into it. It was full of JUNK. There was a very small hole letting water through about 1/8th inch. There was nothing in the hose or the head. So I had finally found the problem. I installed the new valve, turned on the heat and fan and it worked great. As time permits I will flush the cooling system to clean out any debris (sounds like an April type job).

The lesson I learned was not to over look the obvious and assume. I seem to have to relearn this every once in a while. Also, systematic trouble shooting is the best way to locate and fix a problem so you can drive the car instead of spending a beautiful day repairing the car.


©2001 Chicagoland MG Club, All rights reserved.