low fan speed on heat

k5ranger

New Member
Joined
Feb 11, 2010
Location
lexington
the fan blows strong and warm thru defrost but blows weak when switched to vent or floor. floor blows cold, vents blow semi-warm, defrost blows nice and warm....what gives? 90 xj
 
I had a BMW doing this same thing. Turned out to be the radiator. How the hell does a radiator stop working? Had coolant in it, car had 40k on it. Not clogged externally...Damn Germans!
 
check this out....if the jeep is off for a few minutes all controls work fine and blow strong until you switch to defrost. once switched to defrost the air only blows thru defrost ducts. when I switch to vent or heat settings i do not hear any flaps open.
 
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