cljcars

Active Member
When I bought my p38 4.6 the chap said he had just changed the temp sender for a britpart one. She seemed fine on the way back 100 miles or so. Then changed the coolant, matrix seals vapouriser seals. Topped coolant up every time with 50/50.

Whilst doing these things I noticed the temp dropped off, quick, when hot. This was a loose connection. So took it off cleaned up and closed the gap on the clip to make it tighter on the sender, wire seems fine. Sorted it so I thought connection wise. But for some reason it acts strange.

Heats up and usually stays just at very end of the blue into the black, never goes higher. But sometimes it drops, not to the point where you get no reading, just half way back through the blue, not fast but then returns to the end of the blue.

I thought this could be air, or thermostat sticking open. Any thoughts? Happen to anyone before?

Keep opening the expansion tank and hear a little gargle from the radiator. When pressure is released, not much. Coolant is returning back to the expansion tank through the bleed line from the radiator. Doesn't seem to be over pressurized, can still push in the top hose with force, as you would expect.

I think I should stop worrying and just drive it but this is getting on my nerves, find myself watching the dam thing too much. Somone tell me to stop being cricical.
 
Stop being cricical lol
Probable temp drops when viscous fan kicks in then when its cooled down the fan stops and the temp starts rising again
Unless its overheating i wouldnt worry too much
 
Sounds to me like the thermostat is stuck open, normally the temperature needle would sit vertical and not move at all once the engine is up to temperature
 
Sounds like the thermostat to me, if its running too cool = excessive wear, poor fuel consumption.
Davie
 
I am starting to think its the thermostat, You say the temperature guage is supposed to be vertical, its always hovering in the blue or just after. never points straight up. Fueling is fine, at 55mph back from collecting it i managed 24mpg, I did zero it on the motorway. Didn't expect that much at all, Anyway its dropped down to 15.8 mpg over the passed 2 months on gas and petrol.

The other thing that suggests its the thermostat, this morning it took a bit longer to warm up, the heater only turned on when I go to work which is a 7 mile journey, has turned on in the past well before 2 mile mark. Then again it was colder this morning.

Thermostat change then?
 
Right, got it, I will take the Britpart sender out at the same time, where is the best place to get a thermostat and temp sender?

Cheers
 

Similar threads