electric water pump help! - Toyota Yaris Forums

mandriu · 07-21-2007, 11:24 PM

Ok I put the pump in today. As I suspected I had a couple of minor issues. First the belt was too short. So I will try a 425k4 tomorrow. I cut the original radiator hose and inserted the pump pulling water away from the engine. I piggypacked a relay switch to a green wire in the under hood fuse block. It is only on when the key is in the run position.

Problem number one. The thermostat works too well. Water will not go past it. This causes the radiator hose to collapse while engine is cold. I will cut 1/4" weep hole in the thermostat to allow some constant flow.(I am thinking about getting an electric thermostat that will control the pump.)

For now the belt is back on and the pump is not impeding flow so the obd2 reads around 180

I wish I had better news. Thank you for your attention.

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07-21-2007, 11:24 PM	#20
mandriu 11b1p View User's Garage Drives: yaris s Join Date: May 2007 Location: nashville Posts: 44	Ok I put the pump in today. As I suspected I had a couple of minor issues. First the belt was too short. So I will try a 425k4 tomorrow. I cut the original radiator hose and inserted the pump pulling water away from the engine. I piggypacked a relay switch to a green wire in the under hood fuse block. It is only on when the key is in the run position. Problem number one. The thermostat works too well. Water will not go past it. This causes the radiator hose to collapse while engine is cold. I will cut 1/4" weep hole in the thermostat to allow some constant flow.(I am thinking about getting an electric thermostat that will control the pump.) For now the belt is back on and the pump is not impeding flow so the obd2 reads around 180 I wish I had better news. Thank you for your attention.