Water pump/thermostat replacement issues. (1 Viewer)

Joined
Nov 1, 2018
Messages
22
Location
Santa Barbara
Replacing the water pump and thermostat.

First off the new thermostat is different than one being replaced. Not sure if it matters? (Picture attached)

Second, then I’m going to do a radiator flush. Here’s my process, hopefully this is right?

After I get the new thermostat on and water pump on.

1. Attach the fan, shroud, and put the belts back on.
2. Tighten the bolts on the alternator
3. Attaches the top and bottom hoses to the radiator.
4. Fill the radiator with distilled water.
5. Turn car on with heat on high for 5-10 mins, with radiator cap off
6. Drain radiator.
7. Add 5050 to radiator, fill overflow.
8. Repeat step 5.
9. Top off radiator if needed. Close radiator cap.

Then done!

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Last edited:
Joined
Jul 4, 2019
Messages
657
Location
Lexington KY, Boston MA
Flushing is a lot faster with the thermostat out. All the coolant will come out each time you drain, with the thermostat in I only got about a gallon at a time out. Then I took it out and it was a lot quicker, less filling and draining until clean. I drained from the lower rad hose.
 
Last edited:

MoJ

Proven source of misinformation
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Joined
Oct 24, 2003
Messages
4,260
Follow the e9999 flushing method in the faq. Use a Toyota thermostat.
 

ppc

M Go Blue
Joined
Aug 18, 2003
Messages
3,371
Location
Nashville, TN
Buy OEM Toyota thermostat that has the jiggle valve as shown in your picture.

Remove old thermostat, reinstall thermostat housing without thermostat, flush with garden hose while engine running, draining radiator and block several times until everything clear.

Remove front and rear heater hoses and back flush each heater core. Blow water out both cores.

Replace all old heater hoses and heater control valve if not done previously.

Remove old water pump, install new pump and thermostat.

Fill with new coolant and burp out air.
 

ToothDr

GOLD Star
Joined
Apr 11, 2006
Messages
838
Location
Denver
Flush and refill coolant as others have described. X4 on using a Toyota thermostat and water pump.
 

brockdeck

SILVER Star
Joined
Aug 2, 2017
Messages
419
Location
Tustin, California
Can buy an Aisin Thermostat from Amazon or Rockauto and have the exact same part thats in the Toyota box, just cheaper.

Use OE & OEM only on these parts.

Also only use Toyota Red, Aisin Coolant, Zerex Asian, if red coolant is already in the system.
 

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