3.4 overheat!

808-3VZE · 01-22-2013, 04:17 AM

My 95 tacoma overheated last night! Going up a hill noticed that the temp was getting up there so I pulled over popped the hood and coolant started to boil over from the coolant over flow. So I let it cool down added water and drove it back home. I recently done the timing belt and water pump about a month ago. Anybody got a problem like this before? Need all can! Thanks!

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Swimmerboy2112 · 01-22-2013, 05:46 AM

How is your thermostat? You said you just did the t-belt and water pump, perhaps you had an air bubble trapped in the cooling system, happens all the time.

400yzturbo · 01-22-2013, 06:14 AM

When you first start the truck and as it warms up do you see the temp gauge climb in temp then all of a sudden drop in temp. If it does do as mentioned the thermistat would have just opened, potentially eliminating a stuck thermistat. also if the radiator gets hot then you know coolant is circulating.

Another idea is, a bad radiator cap can cause the radiator to push hot coolant into the over-flow and not maintain the needed pressure on the coolant system to keep it from boiling.

Good luck

400yzturbo · 01-22-2013, 06:16 AM

Is your engine the 3.4? The 3.4 wasn't offered in the tacoma until 96. Did you do a swap?

Skidmarcx · 01-22-2013, 08:39 AM

If you have access to a heat gun take readings from both top and bottom radiator hoses... should be at least a 30 degree difference across the radiator. Also check to make sure airflow is not impeded... the fan clutch could be to blame as well

808-3VZE · 01-22-2013, 11:21 AM

Quote:

Originally Posted by Swimmerboy2112

How is your thermostat? You said you just did the t-belt and water pump, perhaps you had an air bubble trapped in the cooling system, happens all the time.

I pulled it this morning the thermostat its the oem one with the little valve on the top

808-3VZE · 01-22-2013, 11:25 AM

I just changed the thermostat and the radiator cap. The cap looked old rubber was damaged. Changed the thermostat too just in case. Filled the radiator up and let it idle for 30 minutes. Temp gauge looks good. I'm crossing my fingers!

01-22-2013, 05:46 AM	#2 (permalink)
Swimmerboy2112 Registered User Personal Sales Rating: (2) Join Date: Apr 2010 Location: Slatedale, PA Posts: 4,740	How is your thermostat? You said you just did the t-belt and water pump, perhaps you had an air bubble trapped in the cooling system, happens all the time. __________________ 1986 4Runner 22RE, 5 Speed, Rebuilt 22RE, Bored .020 over, 261 Cam, LCE Header, BudBuilt Skid Plate, ARB Bull Bar, Warn M8000 Winch, 2" Lift (BJ Spacers & Add-a-leafs), 33x12.5 Super Swamper TSL's, CanBack Soft Top, Roof Basket, 3rd Gen Alloys, SAS in the works! Check out my build thread! SOLD! 2002 Tacoma X-Cab, 5VZE, 5 Speed, E-locker, Borla Exhaust, K&N Intake, Red/Clear Tail lights, Clear Corner Markers, more to come! Check out my build thread!

01-22-2013, 11:25 AM	#7 (permalink)
808-3VZE Registered User Personal Sales Rating: (0) [OP] Join Date: Sep 2010 Location: Honolulu, Hi Posts: 139	I just changed the thermostat and the radiator cap. The cap looked old rubber was damaged. Changed the thermostat too just in case. Filled the radiator up and let it idle for 30 minutes. Temp gauge looks good. I'm crossing my fingers! __________________ 94 Toyota pickup 4x4 3.0v6 5spd 3" body lift. 31x10.50-15 Tires. No cat converter single in dual out Flowmaster. Hope to be soon 3.4 engine swap with a/c.

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01-22-2013, 06:14 AM	#3 (permalink)
400yzturbo Registered User Personal Sales Rating: (0) Join Date: Oct 2008 Location: Logan, Utah Posts: 51	When you first start the truck and as it warms up do you see the temp gauge climb in temp then all of a sudden drop in temp. If it does do as mentioned the thermistat would have just opened, potentially eliminating a stuck thermistat. also if the radiator gets hot then you know coolant is circulating. Another idea is, a bad radiator cap can cause the radiator to push hot coolant into the over-flow and not maintain the needed pressure on the coolant system to keep it from boiling. Good luck

01-22-2013, 06:16 AM	#4 (permalink)
400yzturbo Registered User Personal Sales Rating: (0) Join Date: Oct 2008 Location: Logan, Utah Posts: 51	Is your engine the 3.4? The 3.4 wasn't offered in the tacoma until 96. Did you do a swap?

01-22-2013, 08:39 AM	#5 (permalink)
Skidmarcx Registered User Personal Sales Rating: (0) Join Date: Jan 2013 Posts: 15	If you have access to a heat gun take readings from both top and bottom radiator hoses... should be at least a 30 degree difference across the radiator. Also check to make sure airflow is not impeded... the fan clutch could be to blame as well

01-22-2013, 11:25 AM
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