Ok so if I set my heat around 70 it doesn't blow hot air unless I set the fan all the way up and even then very minimal heat comes out. Now before everyone tells me to search I did and saw that the control unit for the radio causes this but that's normally when the radio stops working. Which my radio works. The air in the coolant thing normally seemed like it was cold at idle and warmed up when driving. Mine doesn't blow warm air ever. So any ideas what this may be?

 

Clogged up heater core possibly?

 

How would I check this?

 

If you need to ask, then you need to take it to a mechanic. :lol:

 

Even though I dislike your name, what is the air temperature around you? This will affect the auto system.

 

Yeah I've had it since I was 16 and owned my mustang on moddedmustangs and just transferred it here for the ease of remembering. Normally my air is set around 70 inside and itll be around 59-62 here.

 

Bump

 

Also if it helps the defrost works front and rear but not the actual heat

 

Is the upper radiator hose (passenger side) hard when the car is warmed up?

 

It is soft, and I discovered it blows heat when its been warmed up for a while at 76 and up. Is that normal?

 

Doesn't sound normal to me.

Is this a new problem, or has the car always done this? When was the last time the coolant was changed?

 

When the car has been warmed up (shouldn't take too long during the summer/fall) the upper radiator hose should be VERY firm and almost too HOT to keep your hand around. If that isn't the case you have a coolant leak somewhere. I bet if you are in neutral or park and you maintain a constant rpm around 2-3k the heat comes from the air vents.

 

Wouldn't there be more serious symptoms if there was a coolant leak other than just the ones i mentioned. It will blow heat at 76 degrees and up from idle or cruising just I would think it should blow lower too.

 

The heat should be pretty damn hot if working properly...no matter what fan speed. If you set the temp to 90 and leave the blower speed on the lowest setting, this should give you the warmest air from the vents.


The issue is either you do not have coolant circulating properly through your heater core...

or you have an electrical issue with the internal HVAC system. The blend door is not working properly, or an interior temp sensor is malfunctioning.


Odds are for the first option based on history on the forums. More often than not, guys reporting weak heating find the issue lies in a coolant bubble that has formed. Some have had interior temp sensor issues, but nowhere as frequently as the coolant theory.

With that said, have you done any coolant maintainence prior to this occuring?

2003 Sedan HVAC service manual BTW.

http://www.nicoclub.com/FSM/G35/Sedan/2003/atc.pdf

 

Is the first one you're talking about the whole air in the system and needing to bleed the air out thing?