recently bought my s2000 and last night i try to turn on the heater and it was just blowing cold air. What could be some reason that blowing cold air? one of the coolant line valve stuck open or close? thanks guys.

car: 2001 s2000

 

Did you recently do a coolant flush or change out your radiator?

You need to check and see if the heater core valve is working. It is located on the passenger side firewall, it is a hose that is sticking out of the firewall then bent in a "U" shape. There is a black plastic part that has a wire cable going to it, when you turn up the temp **** this cable should move. If it doesn't then your temp control could be broken or the valve could be bad. If it does move and you still don't have heat then you have an air bubble in your coolant system. To get rid of the air bubble you will need to get the car up to operating temp with the heat on full high, make sure that fans cycle on a couple of times. Shut the car off and wait for it to cool. You can then open the cap to fill the radiator, it should appear low or you can see the fins. Once you fill the radiator make sure you fill the overflow to the max cold line. Then drive the car around a little with the heat on full high again, park and let it cool. When you check the over flow it maybe a little low if so fill it back to the line, pop off the radiator cap and verify that you can see coolant and it is up to the fill neck. It may take a couple tries to get all the air out, you know you will have all the air out once the heat stays hot all the time.

If I recall correctly you bought a already boosted S. There is a possibility that the previous owner got rid of the hose going to the heater core, as it is in a location that is bad for rubber. Also possible that it was turned sideways and the cable is stuck on something. Regardless don't drive it around town boosting to much as the car can overheat with the low coolant (that is what an air bubble is). You overheat a boosted S you will have a blown head gasket and a warped head.

If I also recall correctly your boosted S has an AEM, did the previous owner get the modifry module so the dash temp gauge would display something? This is needed since the first version AEM EMS did not send a signal to drive the temp gauge on the dash. Or is the AEM just setup so your check engine light comes on after a certain temp (this is a popular method to save the money on the modifry fix)?

If you have no temp gauge stop and fix the coolant bubble as you could easily overheat the car and not know it, that is if your heater core is even hooked up.

 

Here is a picture of what you are looking for, on this car it is the larger hose with the metal bracket that I have circled in red. It should have a black plastic block that has a wire cable going to it, this cable should move when you adjust your temperature up and down.



Again since your car is boosted this valve may have been deleted or turned 90 degrees so it isn't sticking out. If it is gone and there is a shorter hose there then your heater core is always getting hot coolant and you have an air bubble. If it is there and working you have an air bubble. If it has been deleted completely then you will have no heat.

 

i still see the valve with the cable attached to it. but it doesn't seem to move when i change to heater. I have the new AEM EMS Series two so i think it does sent signal to the car temp guage because it does seem to work. i also have an aftermarket temp guage on it too.

 

Okay i got it fix! the valve was stuck. i switch to heater and move the valve by hand and i got heater. now the valve move freely when i move too a/c and heater so it back to working normally . thanks guy

but yeh is it normal for the car to be at 180 F idling? that what my temp guage is reading

 

I'm having this problem with my full race manifold but I think I melted the cable does anyone have a part number I could use to buy another cable

 

i read this and was thinking "why the hell would anyone turn their heat on in august?" lol

 

I'd rather fix it now when I dont need it rather than winter when ill need it everyday