Hey - I say NO HEAT, but really mean very little to none. Is this a common issue? Ive got a 99 with 127,xxx on it. Any quick checks/replacements? fingers crossed, thanks

 

i have awsome heat with poor defrost unsure of that either.....

 

Search is your friend, there are literal hundreds of posts about this. Check your inlet and outlet lines to your heater core, if both are not hot after your engine is warm, then you have a blocked heater core.

 

Clogged heater core. Look into flushing if. Easy, cheap and a reliable fix! Good luck.

 

Poor vacuum maybe. Won't switch to defrost/ will automatically switch off of a vent (i.e. will go from floor to defrost vents then back again) can be the result of poor vacuums. Check the PCV's and vac lines coming off of manifold running toward firewall. Double check PCV's by pulling them off and seeing if they still only allow for air to flow in one direction. Good luck.