computer says my CTS has had it, which doesnt surprise me after seeing the layer of sludge in the coolant overflow tank. i was hoping somone could tell me where it is, and what i would pay for a new one. im assuming its just a case of screwing it out and whacking a new one in? i had a read of my max ellery manual (useless) and it keeps refering to the coolant temp sender unit. is this the same thing? cheers

Coolant temperature sensor is the yellow plug near where the top radiator hose inserts into the intake manifold/head. Unscrew it, screw a new one in. You might also find that it's not actually the sensor, but the wiring to it that is the problem.

does the temp sensor on hte dash come from that sensor? cos i always get reasonable reading on it. if it were stuffed, what would be the side effects? cheers

Quote: Originally Posted by titicaca does the temp sensor on hte dash come from that sensor? cos i always get reasonable reading on it. if it were stuffed, what would be the side effects? cheers No. The dash temp gauge picks up from a different sensor, its near where the CTS is, its smaller and just had a black plug that slides over the top of it. Green wire i think.

cheers would still like to know what the effects of a dodgy coolant sensor would be. i mean, the car still seems to run fine also, my VL is an auto, and i know it wont kick into overdrive until the engine is warm. does this set temperature come from coolant or oil? i would have thought oil

I replaced my CTS. A replacement was around $70 from Repco. My ecu also said mine was faulty. Since changing it i've noticed a decrease in fuel consumption.

Quote: Originally Posted by titicaca computer says my CTS has had it, which doesnt surprise me after seeing the layer of sludge in the coolant overflow tank. i was hoping somone could tell me where it is, and what i would pay for a new one. im assuming its just a case of screwing it out and whacking a new one in? i had a read of my max ellery manual (useless) and it keeps refering to the coolant temp sender unit. is this the same thing? cheers Mate, it all depends on what sorta sludge it is. if its and oily sort of greasy sludge, i think a CTS is going to be the least of your worries...happy days!

Dude ,Take your Oil Cap off and check if there is any sludge and or looks like milky color as you may have cracked head or head gasket.. Check underneathe your radiator cap as well dude.. Good Luck Some original photos have not been recovered yet.

sludge is brown/red ie rusty flushed the radiator on the weekend, so it shouldnt look as bad, but didnt do the engine block so there will still be some in there. car is still running fine. better than before actually no cracked head gasket etc cheers