Pirate 4x4 banner

1 - 10 of 10 Posts

·
Registered
Joined
·
178 Posts
Discussion Starter #1 (Edited)
in the morning when im driving my 4 cyl. truck, if the heater knob is turned to the heat side ( does not matter if heater is turned on or not) the temp gage goes to a little over 1/2 way and then starts to go down to normal ( about 1/4 to 1/3 ). only does it after a cold start, once motor is warm dont have any issues. heres the weird thing. if i have the knob turned to the cold side in the morning it does not go over 1/4 on temp. seems to run cooler if i have knob turned to cold position. already changed thermo stat. what could it be? thanx.
 

·
Registered
Joined
·
215 Posts
On the 22r the heater core return dumps near the thermostat. This water has been cooled by the heater core and is just cold enough to close the thermostat. Once the engine is hot the water usually wont allow the thermostat to close all the way. Toyota has a dual diaphragm thermostat if it really matters to you. The smaller of the two wont close with the heater on and keeps hot water flowing past the main thermo valve for smoother temperature control.
 

·
Registered
Joined
·
178 Posts
Discussion Starter #4
thank you. i thought you guys were going to think i was crazy like everyone else did. thanx again.
 

·
Registered
Joined
·
178 Posts
Discussion Starter #5
ok, i tried to order the part from toyota and they said they dont sell the 2 stage t-stat anymore. anything else i could do to fix this? thanx
 

·
Registered
Joined
·
215 Posts
I'd just drill a hole or two near the edge of the thermostat. This lets just enough water pass through to let the thermostat know the true temp of the engine, and allows it to stay open. If you drill too big you could have some warmup issues but a pair of 1/8" holes should do the trick nicely.
 

·
Registered
Joined
·
385 Posts
4-crawler has the part # posted on his website, I'm pretty sure all they sell are 2-stage due to the TSB.
 

·
nice roach.
Joined
·
5,739 Posts
i bought a two stage thermostat from Roger Brown (4Crawler) on his website...
 
1 - 10 of 10 Posts
Top