Accurate measurement of coolant temperature

[Steves_TR6]

I’d flush the cooling system thoroughly whilst you are ‘in there’

 

Holts sell a two part flushing/neutralising product that i’ve had good results with.

Be sure to flush the heater too.

 

Steve

[IanPatterson]

That was my thoughts also. Thanks for the advice of Holts product.

[Waldi]

 

How do I know what the value of the Thermostat is?

(Remember I am a newbie to the mechanics of the beast).

Ian

Ian,

It is normally stamped on the thermostat, like 82

 

Cheers,

Waldi

[MilesA]

 

By duct I presume the top hose? If so it looks new.

 

 

Ian

 

I am sure Roger is referring to the duct behind the radiator grille, surrounding the radiator that direct all the air towards and through the radiator. Without it, most air just whistles past the radiator reducing its cooling properties. Ask me how I know...

 

Miles

[IanPatterson]

Ah.. Yes the duct is in place and in reasonable nick.

Thanks

Ian

[IanPatterson]

OK, I have got the digital thermometer and done the tests. The kit is very good, and as it has two probes its dead easy to measure top and bottom hose temperatures at the same time.

Air temperature on the day 24/25degs. Temps below are top hose/bottom hose.

Startup from cold, after a few minutes the temps were 67 / 52

driving short distance, temps 76 / 67

Cruising 65 mph @ 2700 revs 80 / 77

Stop and idle, 83 / 79

This is why I thought the car was running hot. The gauge is showing 3/4 hot when cruising / normal running.

 

[IanPatterson]

Missed the pic.

Ian

[Lebro]

OK so now you know where the gauge reads for normal use, problem solved !

 

Good job, well done. That sounds like a useful bit of kit.

 

Bob.

[IanPatterson]

Happy for other members to borrow - just the postal cost.

I bought 3 metre leads so can have the kit in the car.

Ian

[Z320]

everythink is OK with this temperatures

 

Ciao Marco

[stillp]

That gauge reading looks fine. They aren't precision instruments!

 

Pete

[Peter Cobbold]

Hello, I run my 4a on 4life coolant supplied by MG Owners club with a Revotec fan and bottom mounted controller, perfect, gauge read 70 degrees and only wavered in standing traffic, that was before I fitted Efi, while I was rooting about with the temperature feed (I needed one for Efi) I replaced my old sender, the gauge now reads a steady 75 degrees bit, and it is a big but, the ECU tells me the engine temp is 85 degrees, before I wasn't worried, now I am! Something else to add to the list, cheers, Andrew

The waterless coolant wont boil but will make it run hotter. The stuff can catch fire too. Looong thread somewhere.

Peter

[IanPatterson]

Thanks for the comments. Revotec fan installation next.

Main reason is I want to take the beast down to my place in SW France for the whole of summer next year. Can get a bit warm in August

Anyone down in SW France next year (Lot, Dordogne etc. let me know.

Ian

[MilesA]

Ian

 

That looks like a cheap and easy way to test temperatures and verify the gauge. How did you attach or insert the two probes to the hoses?

 

Miles