8v Digi heater problem

[GolfDan]

Could anyone please give me some clues as to what is wrong with my motor? The heater is blowing cool/cold air after I have been sitting in traffic for a short while and then warms again after the engine temp drops! I'm no mechanic so havet got a clue what to do for the best.

Cheers in advance

[free]

sounds like it could be air in the system,
when its cold take cap off header.
put heater on full hot, and the fan on max
start car n when its warm air should stard bubbeling up
but when mind did it had 2 help it a bit, so jamed the throttel open a bit with a brick, at about 2000rpm,
just a fast tickover,
that sorted the job

[Chris Green]

My car has a similar problem.

The heater is very inconsistent, most of the time it is cold.

Does the car have to be completely cold before I remove the header cap? or would it be alright if I just left it for a little while? I understand there is a bit of pressure in the tank while the car is hot.

It is an 86 kjet.