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Overheating issues, fans not running. 1998 camry

24K views 7 replies 5 participants last post by  easywind  
#1 ·
Ok here is my trouble shooting thus far with a multi meter.

The Engine Fans Work, but they only want to turn on when the A/C is on, and even then it overheats
-Fans may not be staying on/cycle with compressor
-Water Temperature Valve not opening

I tested 3 fan relays
-#3 appears to be a SPDT Switch with 1 N/O and 1 N/C set of contacts, when powered both contacts open/close
-#2+1 relays are just SPST and close when powered

This leads me to believe that there is one or more relays in the circuit (saw somewhere/something about and engine relay to test, don't know which or where) or that the water thermostat is not working, or a combination of both.


Any tips??


Also, I'm going to check to see if the thermostat works by checking if the water line out near the oil filter gets hot when the engine runs.
 
#2 · (Edited)
ok well the pipe (1-2" black hose) that enters the top of the radiator gets hots, the other pipe that comes from the bottom then goes into the engine near the oil filter doesn't

I drove around for a bit and got the engine at about ~2/3 of the way up, pulled over and the fans were not running. Again they only turn on for the A/C. Didn't see any leaks, except that a lot of water is pushed out by pressure from evaporated water after the engine was turned off. Doesn't look like and belts are broken, there is a guard covering what looks like a possible water pump.

Anyone?
 
#7 · (Edited)
is this the 2.0 engine? if so, look on the water neck. if it is like my 88 2.0, that sensor on the water neck is the coolant temp switch.

start the car and turn off the AC and blower fan. unplug that connector on the housing with the engine running. the fans should come on right then. if they do, then that switch is probably bad.

with yours being a 98 model, i would take it to a garage and have a code reader plugged to it so you can see whats happening. its going to have to be one of the readers that show the data stream. i think the coolant readings are part of the OOBDII data stream from the ECM.
 
#8 ·
As a New Yorker who drives an older car and gets stuck in traffic often I have wired my fan to a switch directly into the cabin. This way before I come to tunnel traffic or stop and go traffic I can turn the fan on. Only thing is that it you need to remember to turn it off when you shut the car off unless you find a ignition wire.