cold air in through the floor vent

[Steffen84]

everywhere is warm air coming out except in the floor. Cold feet are bad theese days. What is the problem?

 

[old_man]

First off, what year model?

If you only get hot air out the defrost vents, you most likely have a vacuum leak.

 

[Steffen84]

It is a 1990 XJ. And no I got hot air everywhere but not out of the floor...there it is cold

 

[Digger87xj]

Very odd.

Knowing what I know about the XJ HVAC, I can't fathom how that can occur. The blend door is cable actuated and the mode doors are vacuum. Changing modes should not affect temperature.

 

[AKghandi]

my guess is a vacuum leak and a cold draft.

i had heater mode issues on my 90 and it was a vac line next to the battery

 

[Steffen84]

all vacuum is ok as I changed every line! it is just the fact that there comes cold air no warm air out off the floor vents

 

[Matthew Currie]

My 95 had a cold air draft on the passenger side that I never quite figured out, but I think it was from a defective windshield seal. It got so bad by the end that it was quite uncomfortable in winter. Hot air was coming out, but it was not enough to counter the draft. There was no obvious place it was coming in, but at highway speed it was freezing. The 99 had it to a lesser degree, getting worse with age.