I. Instead of the Thermostat

On rarely occasions, in high-mileage Camrys, the cooling system's thermostat may fail. A thermostat might lock increase in one of two people the open up or closed position bring about overcooling or overheating.

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In one case when a thermostat failed, the client complained that he was acquiring heat in the cabin. He said the temperature gauge ~ above the dashboard would rise to the common operating selection during warmup, then rapidly move down come the cold range. I concluded this particular malfunction was as result of a defective thermostat that would certainly stick in the completely open place after getting to normal operating temperatures (around 190 degrees Fahrenheit). The just material price of repairing this trouble was $5 because that a brand-new thermostat and also $8 for a gallon of brand-new pre-mixed coolant. The customer had previously to be quoted a sizable repair estimate, including flushing the cooling system and installing a brand-new heater core with brand-new hoses.

Thermostat replacement Procedure


Diagram: Camry thermostat, gasket, and housing

1. First, make certain the engine is cool.

Then relieve any kind of residual pressure in the cooling device by removing the radiator cap. Eliminate the lower radiator water tap from the thermostat housing. This step might not be essential if you feel you have the right to remove the thermostat housing from the water pump through bending the hose.


2. Use penetrating oil on the subject of the thermostat housing.

3. Usage a 10 mm socket attached to a expansion to eliminate the height nut from the housing stud.

Use no extension for the reduced nut. A 10 mm box wrench have the right to be provided on the top nut, yet there is very small twisting room for the lower nut uneven the oil filter is removed.

4. Eliminate the thermostat housing with a solid tugging or pulling motion.

Approximately 1/2 gallon the coolant will certainly leak out as soon as the housing is removed. The thermostat will most most likely be stuck inside the housing.

5. Eliminate the old thermostat with the enclosed rubber O-ring.

Transfer the O-ring to the brand-new thermostat or use a brand-new O-ring if friend want.

6. Turning back the above steps because that installation, refill the radiator with brand-new fluid, begin engine until warmed up and also recheck fluid levels after cool down.

Allowing the engine to idle for 1/2 hour with the radiator lid off can aid remove air pockets.

New Camry water temperature sensor

2. Replacing the Temperature Sensor

If the car continues to overheat also after installation a new thermostat, the problem could be resulted in by one of two people a defective temperature sensor or a defective fan motor. Instead of of the water temperature sensor may be in order. This sensor is situated on the bottom of the radiator opposite the coolant drainpipe port. It works in conjunction with your car's ECU (Electronic control Unit) to readjust the air/fuel mixture based upon the coolant temperature. If the sensor is not sending out the correct electrical signal, the ECU will misinterpret the signal by do the air/fuel mixture as well rich or as well lean. Most commonly, a malfunction of this sensor results in over-enriching the air/fuel mixture, causing the engine come stall at website traffic stops. And an engine will run cooler with an enriched air/fuel mixture.

Temperature Sensor instead of Procedure

This sensor has actually an O-ring, for this reason ask for the O-ring when you purchase a new sensor.

The easiest an approach of acquiring to and replacing the temperature sensor is by remove the passenger-side fan shroud assembly.

1. Disconnect the fan motor electric connector.

Detached fan motor socket

2. Remove the two 10 mm shroud bolts the secure the shroud come the radiator.

3. Lift the end the shroud indigenous the lower radiator shroud sockets. The pan motor have the right to be tested by using 12 volts come the engine connector leads.

4. The temperature sensor is currently exposed. Detach the electric connector.

5. Usage an open-end or box wrench come spin off the sensor. When the sensor is removed, coolant will start leaking out. To save all the coolant native draining out, conveniently screw in the new sensor through hand. Don't forget the O-ring attached come the sensor.

6. Turning back the above steps because that re-assembly, and also replenish the leaked-out coolant. I recommend using only genuine Toyota coolant.

This post is accurate and also true to the ideal of the author’s knowledge. Content is because that informational or entertainment purposes only and also does not substitute for personal counsel or skilled advice in business, financial, legal, or technological matters.

Questions & Answers

Question: Is replacing a thermostat a big job?

Answer: the is really simple. There's just two 10 mm nuts that host the thermostat real estate (which includes the thermostat). Those nuts are basic to eliminate if you remove the oil filter first.

Question: Is replacing the thermostat a huge job?

Answer: over there are only two 10 mm nuts that hold the thermostat housing (which contains the thermostat). Those nuts are easy to remove if you eliminate the oil filter first.

Question: If I eliminate the oil filter, doesn't the oil to water out?

Answer: generally yes unless you wait about a hour to let the oil in the filter drain out into the oil pan.


Del ~ above October 22, 2017:

I have actually a 2000 corolla ce. Both fans on when supplied power. Replaced sensor by thermostat, changed fan move in fuse box, still very same problem. Any type of thoughts. It runs fine, no dash lights etc... Simply needs to it is in fixed. Thanks

Tosin top top January 22, 2017:

I have actually a 1997 version Camry, that a recent a experience hard start (long start, around three rolling) prior to it will certainly answer me. What could be the cause?

hardlymoving (author) from Memphis, TN on January 16, 2017:


Start by replacing the thermostat.

KK ~ above January 15, 2017:

I have 1999 Toyota Camry LE 2.2 L, once I drive its temperature sensor gauge in vehicle shows at C or close to C. Auto heats up and show at 1/6 of selection on needle above C in ~ idle after drive (gauge moves). What must be food of action? Is the ok to drive?

Jei ~ above December 26, 2016:

I have a 2001 Camry in Cancun Mexico where is never cold, deserve to I operation this auto with out a thermostat, the one simply went & by the moment a walk there through the part maybe another month and also the local mechanic said that we could just remove it and it would certainly be fine, is that true??

hardlymoving (author) from Memphis, TN top top November 14, 2016:


Could it is in a variety of things to plenty of to mention based upon your stated symptoms.

Govin on November 14, 2016:

i have 1999 camry. The is stalling at prevent lights, hesitating to advice in the morning as soon as i very first time, and sometimes NOT beginning and just cranking. Will certainly it be as result of faulty temp sensor or T-stat?

armen bagdasarian on October 17, 2016:

could not obtain 98 electronic came v6 to give me a "ready" for evap or cat. Journey the heck out that it, began shotgun approach, i found it temp gauge mid scale and alternately cold. Lengthy story short, traction thermostat, shiny clues on inner tube which dwellings paraffin. Rock stable temp, mid range maybe trouble solved.

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Rusty on July 01, 2016:

Hello. I have actually a 2004 Toyota Camry. When the auto heats up the temperature gauge goes above the common operating pleasant (about 3/4 means up to H) then stops. The fans execute not kick on. It never ever makes it all the method to the H. If I rotate the AC top top the fans run. The heat and AC both work-related fine. Any suggestions?

hardlymoving (author) native Memphis, TN on June 22, 2016:


A fell down hose indicates a broken/defective radiator cap.

Dustin ~ above June 21, 2016:

Hi, I've had a many of problems with d hoses and also such.. Simply replaced timing belt water pump thermostat radiator and also other such hoses and also other things connected with the cooling system.. My upper hose is collapsing in in chin (brand new) I require to find a water tap that will stand up and stand out quite than crumble and to properly burp the system of any kind of air... And also I don't have actually a no spill funnel to assist w the job.. Any advice or help would be considerably appreciated. 99 Camry ce 2.2 160,000 miles