1993C4LT1

Any tips for changing the sensor that goes in the waterpump? 93 LT1

FSM says to drain all coolant. Honestly, if I don't have to, I won't. Just don't want to get the opti wet.

antfarmer2

righty tighty lefty loosey no you do not need to drain it all and you know about the opti. sounds like you have it well in hand!!!!!!

jph46

I placed a plastic zip lock bag under the water pump to catch the coolant in the water pump, even after draining the system. Also placed a rag under the WP just to be sure. WP will retain coolant,work fast.

pcolt94

I believe there should be a pre sealant on the new sensor. Don’t over tighten and does not have to be screwed in all the way. Plan to stop tightening when the lock is facing the (left) drivers side of the car. Careful not to slip with the wrench and bust the plastic connector right off.

Clean up the area if need be before you remove the old sensor.

if you have not replaced you coolant in 2 years, now would be a good time. If your coolant is relatively new you can put 90% back in if you catch it in a clean bucket. I jack the driver's side a bit more higher so the coolant runs right down that shoot (I clean the shoot first) into my bucket. I always strain it when I put it back in.

1993C4LT1

Coolant is about 1.5 years old. I'll wait another 6 months flush it and replace it. Yes, new sensor has some sort of loctite on it. Thank you all

eschoendorff

When I changed mine, I put plastic and then a rag between the optic and the WP. Then I made a drip run out of tin foil that I placed right under the coolant temp sensor. It was tot overkill I'm sure but I did not drain any coolant for the job and no coolant ever got near the opti. Instead it ran down the foil drip run and into a pan under the radiator support.

jph46

FSM calls for 108 lb.in on a 93 or 1 click of the wrist.

Christi@n

Remove old and put the new one. You'll lost a little bit of coolant, any problem.

Do it with cold engine

pcolt94

You can say goodbye to the ECT and the pump at 108 ft lbs. You're in the wrong section. FSM says 17 ft lbs or 204 inch lbs.

I never actually used a torque wrench on it possibly because getting the socket on it. I just snug it up to where the lock faces me so I can see it well to release it.

Christi@n

He said 108 lbs in.

However my manual call for 17 lb ft too

1993C4LT1

New one is in, AC Delco of course No more service engine soon light Vette brothers, pray that it stays that way.

I haven't started the car since Friday morning, so I guess that's why it barely leaked any coolant out. It was very cold this morning, about 28 farenheit.

antfarmer2

jph46

From page 6E3-C1-12 under remove or disconnect it states 108 lb. in. , however page 14 under torque specs it says 17 lb. ft.. Almost double. Like I said one click of the wrist.
Cheers

pcolt94

My mistake and I looked at sentence a few times.

Thanks I stand corrected.

Christi@n

17 from chilton manual.

Indio Monk

I just changed my tension pulley and serpentine belt and busted my coolant temp sensor. I noticed that my temp does not go past 142 degrees and my "service engine light" is on. I ordered a new CTS and hopefully it will fix the problem! Hope yours is fixed.

1993C4LT1

Yes, it's fine. I bought an AC Delco coolant sensor from the dealer. It was only 20 bucks.