bypass is possible,but you will have to remove the dash light,as it will keep burning.

you an pry open the unit and replace the resitor wire,which is probably burned through.

only available second hand,but cn be repaired!

hello Steve,

i face the same problem,but only from time to time.

cold wind only,airco engaged even whenn put at max heat.cured sometimes by sitching engine on and off.

start with the easypart, the vacuum controlled valve at the rear of the cyl.head.( the little round golden bulb.

it should CLOSE whenn asked for heat,and open for cold air.

this part gets spoiled quite often,

you could replace by a plastic valve,doing the same,costs a fraction and lasts longer.

it did not solve my problem yet,will keep you informed on the research.

thanks Laurence.

i knew you could help me!

please send.. although these rare parts are expensive and transportcosts prohibitive !

therefore only the right hand side one would do..

regards to Christina.