where should the water temp sensor be?
Thread Starter
Instructor
Joined: Jan 2004
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From: franklin sqaureish ny
where should the water temp sensor be?
i have 2 water temp sensors in my car... one reads 195-220 and the other reads 175-195
the one that reads 195-220 in is the front of the block right next to the water neck....
the other is on the back right side of the block and reads 175-195...
the cooling system isnt flowing over... which gauge is correct ???
the one that reads 195-220 in is the front of the block right next to the water neck....
the other is on the back right side of the block and reads 175-195...
the cooling system isnt flowing over... which gauge is correct ???
Melting Slicks
Joined: Aug 2005
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Either they're both correct, being that the motor is different temps in different locations, or...they're both wrong in that they are not calibrated together. I have three water temp gauges and they're all somewhat close, but not exact.
Melting Slicks
Joined: Aug 2005
Posts: 2,606
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So are they two identical gauges? Do not rely (completely) on the factory gauge. I'm using a manual-sender in the passenger side head, an electric in the driver's side head and a manual dial-type gauge in the water pump.
Melting Slicks
Joined: Aug 2005
Posts: 2,606
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When I was having problems with my stock (electrical) gauge, I installed (temporarily) a manual gauge under the hood in the opposite head (pass.). The stock gauge said 220 and the manual gauge said 185. Try installing a manual gauge and see what happens.
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Pro
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From: Naperville IL
I'm pretty sure the sender on the passenger side of the block has something to do with a throttle control solonoid on the carb...more emmissions stuff. I only know about it because I found the connector for it smoking on the exhaust manifold. I'd have no problem believing that the block is different temps at different places though.
Le Mans Master
Joined: Jan 2006
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From: Wilmington DE, Drive it like you stole it, 68 327 4 speed coupe
Originally Posted by gtsvette
cool.... i guess ill try both.... Now ill Have 3
oh yeh i had my IR laser the upper rad hose was saying 193.. and the rad tanks were 165.
oh yeh i had my IR laser the upper rad hose was saying 193.. and the rad tanks were 165.the difference is that early small blocks ( up to 68) had the sensor in the intake then later GM moved it to the heads (driver side, pass was for later options) because it would give a more accurate reading of coolant temp in the engine. I would say they are both reading acurately, but the heads are more revelent to overall engine temp as indicated by GM
what this practically menat is that you got an engine with larter heads and an earlier intake .
no biggie, GM saya heads are beetr place
tim
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Instructor
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From: franklin sqaureish ny
the motor is an olds 455... i ran the car today and it seems to be running goood.... the temps were all below 200....but when i carry the car on the highway the front goes up to 219 and the rear goes to 197.... can the type of wire that i use cause inaccurate readings??? what wire is best and would the length of the wire change the readings??