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[Roberts588]

Hi guys, I've got a 1999 XJ 4.0l orvis.

Had a few problems with it since I bought it in September 2012 but I managed to sort them myself. BUT I have one left that is bugging me something stupid!

My heater only blows trough defrost!!!!!

Anyone experienced this?

I've changed the switch, relay, the knob... Still carnt figure it out!

[Panic mechanic!]

vaccuum leak ?

[Roberts588]

How do I check for that?

Easy fix?

[Brynjaminjones]

This happened to mum's 4.0 TJ (I assume very similar to the XJ), and a vacuum hose had popped off the intake manifold.

Popped it back on and all was well.

See the photos on this page:
http://www.jeepforum.com/forum/f9/all-settings-heater-ac-fan-blow-only-through-defroster-527339/

[Roberts588]

Just check that and it's all connected. Really bugging me!!

[Panic mechanic!]

check the air reservoir ( white tank (plastic)) behind n/s headlamp and make sure after running the engine that there is actually some vacuum in it by pulling the hose of and listeing for it to suck in the air

[Roberts588]

Will do!

Just seen on some US forum it could be a blend door or the blend door?

Dash out job?

[Panic mechanic!]

not on an xj, blend doors problems are on zj/wj I beleive but may be wrong!