Hvac problems

[pauliescff]

1994 e34 525. Most recently and intermittently, when I select cold air from all the vents, I will get heat from the floor vents. If I shut the car off and hen restart it, it will usually resolve itself for a few weeks. Does this sound like a heater valve going bad or a stepper motor for the blend door? Thanks

[pauliescff]

1994 e34 525. Most recently and intermittently, when I select cold air from all the vents, I will get heat from the floor vents. If I shut the car off and hen restart it, it will usually resolve itself for a few weeks. Does this sound like a heater valve going bad or a stepper motor for the blend door? Thanks

Seriously? Nobody has anything?

[south42]

I am going to guess that your heater valve is sticking open.


Andy

[pauliescff]

I went ahead and replaced the heater valve anyway. We'll see if that resolved the priblem

[pauliescff]

Opened up the old heater valve and found 1 of th diaphragms had disintegrated.