Heater not working - Toyota Nation Forum : Toyota Car and Truck Forums

blue_hatch · 11-29-2007, 10:24 AM

My 93 camry stopped making heat ever since it started getting cold outside. The fan control works, its just blowing cold air. The engine warms up fine. I replaced the ressistor with a diffrent one and still the same results. Is there any other thing that might be causing this to happen. Could it be the heater core?

dc_98_cam · 11-29-2007, 11:01 AM

There is a water valve which controls hot water to the heater core .... maybe you could check the hoses going to and from this valve .... determine if both inlet and outlet are warm when heater is turned on .... Visibly inspect, see if anything is obviously stuck or jammed.
See p. 52 of Air Conditioning section of Gen 3 online repair manual ... top of forum page.

***toyomoho*** · 11-29-2007, 12:54 PM

The resisters control fan speed. The actual heat comes from coolant running through the heater core inside the car. If the heater control valve is stuck closed or the core is plugged coolant will not circulate and no heat.

As DC states check for heater valve operation and hose temps. Might pull the heater hose just before the valve then run a pencil into the valve to see if it is open. You can also remove the heater hose running back to the engine then use a garden hose to flush the core out and see how much flow you have.

Study the heater design in the manual so you will understand how the system works.

digmycelica · 11-29-2007, 06:33 PM

Quote:

Originally Posted by blue_hatch

My 93 camry stopped making heat ever since it started getting cold outside. The fan control works, its just blowing cold air. The engine warms up fine. I replaced the ressistor with a diffrent one and still the same results. Is there any other thing that might be causing this to happen. Could it be the heater core?

Check the coolant level , check thermostat .

Kep · 11-30-2007, 10:22 AM

Is the engine temperature gauge showing that it is warm or is the needle pegged at cold?

Kep

blue_hatch · 11-30-2007, 12:30 PM

car warms up fine, and there is coolant there. Its been too cold I havent had a chance to take a closser look. Most likely the core is clogged

digmycelica · 11-30-2007, 01:26 PM

Quote:

Originally Posted by blue_hatch

car warms up fine, and there is coolant there. Its been too cold I havent had a chance to take a closser look. Most likely the core is clogged

I am unsure what you mean by the car warms up fine. I'm guessing that you mean that the temp guage is running about halfway after i truns for 5 minutes or so, and when it reaches this point, you still don't have any heat at all. (right)?
I would not jump to the conclusion so fast that it's the core, although it may be, I would check everything else first.

blue_hatch · 11-30-2007, 01:29 PM

yeah the car warms up fine and stops in the middle of the temp gauge. I just went out to look at the car, the inlet and outlet house that mounts to the firewall both are warm/hot. So im kind of lose right now as where the problem lies.

digmycelica · 11-30-2007, 01:34 PM

Quote:

Originally Posted by blue_hatch

yeah the car warms up fine and stops in the middle of the temp gauge. I just went out to look at the car, the inlet and outlet house that mounts to the firewall both are warm/hot. So im kind of lose right now as where the problem lies.

It sounds like the heater control is not working or opening . you know the part that moves when you turn the heater to either hot or cold.
What you need to do is take both heater hoses completely off and take a hose pipe to one pipe on the heater core and flush it out to see if water comes out the other pipe.

digmycelica · 11-30-2007, 01:38 PM

Quote:

Originally Posted by blue_hatch

yeah the car warms up fine and stops in the middle of the temp gauge. I just went out to look at the car, the inlet and outlet house that mounts to the firewall both are warm/hot. So im kind of lose right now as where the problem lies.

Hey Blue,
What kind of control do you have on the dash?
Is it a slider or is it a knob you turn clockwise for heat and counterclockwise for cool?
If it's a knob, pull it off and see if the knob is cracked or split on the backside thus not really turning anything. I've seen a lot of honda do that.

blue_hatch · 12-01-2007, 10:06 AM

its a knob, and it works because it still adjusts the coolant valve.

***toyomoho*** · 12-01-2007, 01:15 PM

The knob opens and closes the heater control valve. Keep in mind the arm or rod on the valve could be moving but the valve is stuck. If the valve is OK (by testing), the core could be plugged.

Dave's · 12-01-2007, 08:46 PM

Think there's also a 'door' in the plenum (heater core box). Sometimes the control which moves it doesn't work. Just another thing to check.

blue_hatch · 12-03-2007, 12:55 PM

Quote:

Originally Posted by toyomoho

The knob opens and closes the heater control valve. Keep in mind the arm or rod on the valve could be moving but the valve is stuck. If the valve is OK (by testing), the core could be plugged.

guess your right, the valve was stuck close so i used a small crewdriver and pushed it open. thanks for the help guys

1996camry · 12-03-2007, 02:28 PM

sound like your thermostat stuck open allow cold air going thru all the time...not hot air go out to your car...thermostat only cost 20 bucks from the dealer and replaced to see if it fix your problem....

does it takes long time to warn the car to normal temp? if it does, then your thermostat is stuck open all the time...thermostat..when your car get hot, the thermostat open to antifreeze circulate to cool the engine down..if it stuck open and never close, then it allow cold air go thru..and never close the thermostat to make heat....