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Thanks all for the replies. I'll go to my mechanic this weekend and see what he says. I'll update the post with the info.

Thanks a lot for the reply. But how the rpm become normal as soon as I clean the throttle body. What could cause the TB to get deposits more sooner. Please advice.

No. I use petrol (octane 90).

Hi all, I have a corolla AE100 (yom: 1995) and it has the following problem. I need your kind advice on this issue. When I tuned up the engine last time (an year back), I reported to the mechanic that the pulling power was not enough. He said it was because the engine rpm was low (around 400-500) and it should be around 700 for normal operation. Then he said after the tune up the rpm has come to the normal level. I too felt that the engine got more power after the tune up. Then after around 2 months time, I could feel that the rpm has gone down as it was previously. According to one of my friends suggestion, I cleaned the throttle body myself. Then the rpm has come to the norml level. But again the same happened after around 2 months time. This indicated me (don't know whether it is true) that there is some relationship between the TB and the rpm. while I cleaned the throttle body, I didn't see much corbon deposits also. Is there any relationship between the throttle body deposit and rpm? That is like when the TB gets dirty, engine rpm goes down. Is there any specific reason for the throttle body gettig more deposits in less time? Please, I need your expert advice.

Thanks for all the replies. Can I have more inputs on the time? especially the time taken in morning.

Thanks for the replies. The fan works ok. To make sure the problem is with the valve/thermostat I need to know how long a normal (toyota) car takes to warm up. Mine is around 10 yrs old. Can you people give your car readings (how many minutes it takes for the engine to warm up)?

Thanks for such descriptive info. About the fan, the electric fan seems to work when the engine is hot. It is not ON always (in my car). So, I think the fan problem would not be there. But my doubt is that whether the thermostat is open always. That is, the radiator coolant circulates since I start the engine which will increase the time to reach the operating temperature. Won't this be a case? And I am worried that, since the engine runs cold for a longer time period, this may consume more fuel.

Thanks for the reply. This is with the A/C is on. When the A/C is switched off the time taken is lesser. Can you please explain a bit more about the fan thing because I didn't understand it well.

Hi, I have a toyota corolla (AE100) car. When I start the car and drive in the morning, it takes more than 10 minutes (sometimes around 15 mins) for the temperature gauge to come to the mid point (operating temperature). Is this a normal behaviour? Or is this the sign of 'thermostat stuck open'? If so, what other symptoms I can observe from the car? Please advice. Thanks.

Anybody recently replaced the ball joints? How much does one cost? Mine is a toyota corolla AE100.

Thanks for the replies. I replaced the ball joints last year, so they are one year old. Do I have to change the ball joints every year?

There has been a clunking noise coming from the front wheels of my car. This noise was firstly heard when I turn the wheels through steering and later it has been always there while drinving. My mechanic diagnosed it and told me that the ball joints are tight (very hard to move) and bacause of that the noise is coming. He oiled the joints to temporarily eliminate the noise. According to him the joint was not damaged but only problem is not enough lubrication. He suggested me to drill a hole and place a nipple on to it so that the joint can be lubricated periodically. I haven't decided yet to go for his option. What do you guys think? What could be the cause of this problem? Anybody experienced similar situation? How did you overcome such a problem? Please share your experience with me, It would be a great help.

I was able to repair my evaporator coil (welding) and now my a/c works fine (cost: 5k). But, the only problem is (as somebody mentioned already), the elctronic thermostat didn't work after the repair. I had to install a manual one (temporary solution) until I go for a new coil.

Thanks for the info. I'll definitely consult another shop. But, how about welding? is it not possible on these coils?

Hi, My car a/c evaporator coil has developed a leak. One of the auto a/c shops diagnosed the problem and quoted me 17k to replace (malaysian part) and service. There are 2 places in the coil where the leak is present. My problem is, I have already done the same repair around 1.5 years back from the same shop. They said it normally lasts for atleast 3 years, and the warranty covers only 1 year so they can't help on it. I don't know how this happened; I do drive daily with a/c on. I should blame my fate. Anybody here knows an alternative (cheap) way (other than a replacement)? How about welding? Please recommend me the places too. Thanks in advance.