Been for good blat today and noticed, in this cooler weather, the water temp did not rise above 80 except when stationary in traffic. Went out again this evening and the temp didn't go over 60 which is definately too cold, as I think the optimal temp should be 90. Does it sound like my thermostat is knackered/stuck open?

Ta.

yep it does.
wear on the engine will be substantial if you keep driving it like that.

are you sure the temp sender isn't lying?

grtz

Definitely worth checking - those temps are too cold to be good for the engine.

check the actual temp with a ( borrowed ) laser temp. gauge.

Most temp' senders are between the thermostat and the radiator - hence they only see the water that the thermostat releases from around the block.

IF your thermostat is working properly then it's perfectly safe to see 50 Celsius in the rad' and pipework because the thermostat will be holding the water around the block/head at whatever temp' the thermostat is set to work at. It's usually 80+ Celsius.

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Most temp' senders are between the thermostat and the radiator

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I'm guessing that you're moving the temp' sender to the head/block water system?

Why? Are you running with a thermostat? If you are I can't see the point of moving the temp' sender so I'm confused.

We need a confused emoticon eh!

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Originally posted by JAG
Most temp' senders are between the thermostat and the radiator - hence they only see the water that the thermostat releases from around the block.

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Jag

I'm running a stat because it's supposed to be better for the engine - see my post. I want to know what the temperature of the water coming out of the engine is, not what the temperature of the almost static water the other side of the closed thermostat is!

Wyn

Temp sender on a Pinto is in the head.