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1990 Toyota Camry Heater Question #3


toajr's Avatar
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10-22-02, 05:45 AM   #1  
toajr
1990 Toyota Camry Heater Question #3

I want to thank all who tried to help me diagnose and fix my heater problem.

I finally broke down and took it to a small Toyota Dealership. They initially said they would dianose the problem for $45.00. Anyway the said the problem was a clogged heater core and that I had two options. Try and blow it out or just rerplace the heater core for $1,000.00.

I had them blow out the heater core. They only charged me $132.50 total, probably because they only got it to produce a luke warm temperature.

I took the car home and them proceeded to flush out the heater core directly with pouring engine flush directly into one port thru a heater hose and blowing it out with an electric water power washer. i repeated this thru both ports, basicially flushing and back flushing the heater core.

I them reverved the heater hoses to get a reverse flush using the hot water and pressure from the system. i ran it up and down the highway for about an hour. I enven got some pretty good heat at times.

I hookes the hoses back up correctly and it appears the system is working at least 60% as an average using outside air only.

So sometimes it pays to get the right diagnose by an expert inorder to determine how to proceed with a problem. TOAJR


Last edited by toajr; 11-01-02 at 08:51 AM.
 
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10-22-02, 06:19 AM   #2  
iwasbornin1970
Do you have overheating problems too? Toyota's run pretty cool, I wouldn't be suprised with fairly low pressure even when the engine's been running awhile. Take it out for a run on the highway, pull off, and check the pressure when it's good and hot.

If it's running hot, I'd suspect the water pump. Otherwise, the heater core or lines. Your coolant will take the path of least resistance through the system, and even minor blockage in the core would prevent hot coolant from flowing freely.

 
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10-22-02, 08:03 AM   #3  
Joe_F
Have you changed the radiator cap?

 
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10-22-02, 10:53 AM   #4  
By any chance is this the "button" type control with an "auto" setting?

Larry

 
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10-24-02, 09:44 AM   #5  
toajr
1990 Toyota Camry Heater Question #3

By any chance is this the "button" type control with an "auto" setting?
No, it appears to be a cable operated temperature control system. The only button is use to switch between the AC compressor and vent air sytem. All other controls use a mechanical cable for adjstments. However, the temperature control mechanism does click which could be an electronic signal, I'll need to do some further investigation to determine that.

 
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10-24-02, 10:37 AM   #6  
If the temp control is electronic thats were the problem is. It needs to be replaced, better off with a junk yard one.

Larry

 
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10-24-02, 07:42 PM   #7  
D.Poirier
camry no heat

this car uses a water control valve on the inlet hose. check to see if the cable is moving the arm on or off.I'm not sure if the valve is under the dash or out by the fire wall.make sure you get all the air out of the cooling system or else it gets cought in the heatercore.

 
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10-25-02, 04:26 AM   #8  
toajr
Camry no heat

The water control valve is working properly. It's located at the firewall. I believe the problem is the air door which control the amount of air flow thru the heater core. The temperature conrol mechanism is a slide cable which controls both water control valve and the air door mixing. While the mechanism appears to operation correctly, I'm not sure that the Air mix control servo which is also electronic is workinging. See my post under "1990 Toyota Camry Heater Question #4" dated 10/24/02. Maybe you'll be able help there. I've pulled the radio and instrument cover panel to get a better visual view of the operating servo, but I'm still not sure that is the problem.

 
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10-25-02, 05:58 AM   #9  
Joe_F
I suggest an Alldata.com subscription or the factory service manual to test the controller before damning it as bad (although I agree with Larry that the problem is likely there.

 
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