hey guys wats up,hope u can help me find my problem,my 03 s2k has an overheating problem,it all started 3 weeks ago when i tried to turn my heater on, heater wouldnt work so i went on the forums here to try and solve that. I did solve the problom by just opening the hood and moving the little lever to hot,its next to the hose in the firewall,and bam my heater worked but it takes awhile for the heat to come out inside. After i did that is when my overheating problem started. All out through summer i used the a/c full blast and never overheated, can anybody help me out ?

 

How's the coolant level?
When was the last time the coolant has been changed?
If the coolant has not been changed in a very long time, it can eat through the thermostat rubber parts, good news is they are cheap.

 

the coolant level is good,ive had it for 4mo and i dnt know when was the last time they changed the coolant,in the summer with a/c full blast it never overheated

 

Is it possible that the heater core had no coolant in it and when you opened that "hot" lever (which I didn't know about) you introduced air into the coolant system? I would follow the coolant bleeding procedure to try to bleed any potential air pockets out of the coolant system. I believe Billman or someone posted a DIY on how to bleed the coolant lines.

 

^ This sounds like a plausible scenario, if you haven't owned the vehicle for very long it may be possible that someone did a coolant change and they didn't do a proper bleed procedure and the heater core bypass valve did not allow the procedure to be done correctly as it appears to be defective. If you don't get the heater to full hot setting on the temp dial you won't get a proper bleed during a coolant change, and air pockets will cause havoc with over-heating situations.

 

thanx guys for all the help im going to try to change the thermostat and flush the coolant hopefully that helps.