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Old 07-06-2016, 11:19 AM   #1 (permalink)
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Default 2006 Forenza Overheating after long block replacement

Friends car.
His timing belt broke, he chose a remanufactured long block from engineguy.com

Vehicle was not overheating, loosing coolant, or running hot before timing belt broke.

All gaskets were replaced when moving components over.

Long block came with a new water pump, and timing belt was installed by builder.

No leaks in (Listing the hoses I checked, in case I forgot something)
Upper radiator hose
Lower radiator hose
either coolant hose coming off the throttle body
heater hoses
Coolant supply hose? (On back of motor)
overflow hose
Hose from plastic elbow near ignition coil to surge tank
radiator
thermostat housing
coolant manifold near alternator

have installed a new surge tank cap, and using a 50/50 mix of new coolant.


One issue came up with the long block. We received a 2004 or 2005 block, but have a 2006 car.
The only difference I could see was the crankcase vent (to the valve cover) and the pedestal that holds the egr and coil
got a 2005 valve cover, oil dipstick, and egr pedestal. Everything seemed to bolt up just fine, no leaks, and it runs smooth.

The car will start fine, and begin to heat to operating temp, the heater gets hot, and eventually the fans kick on.

I can watch the coolant temp with my scan tool and it steadily rises, rises faster if the car is being driven, until the needle begins to go past halfway and then steam and coolant come out of the surge tank cap.

The only part of the cooling system that has been replaced is the water pump (And surge tank cap) and all of the cooling system components were functioning normally before.

Can anyone think of anything I may have misrouted or overlooked? Any recommended tests to perform?
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Old 07-06-2016, 06:11 PM   #2 (permalink)
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Just an update for anyone that finds this thread.

I looked at the car today and the heater hose T fitting was broken, it must have happened from the excess pressure. I replaced the t fitting and the thermostat since the coolant was already drained. The temperature reached a high of 208 during a highway cruise in 90 degree weather with the ac full blast, but couldn't get it any higher than that, and it always dropped back down.

Every now and again I need something like this to remind me to keep it simple.
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Old 07-12-2016, 11:06 PM   #3 (permalink)
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Good find... I once had a cracked impeller on a replacement water pump that would allow the shaft to spin without the impeller... kept thinking it was the thermostat lol
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