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Laika

Temp under 80 degrees

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Hi

I commute in my GT3 in stop start motorway traffic... not ideal ! during this recent hot weather in the UK I have been keeping an eye on my temp gauge. ..

And noticed it never goes over 80 degrees !

 

Surely that cannot be right ... please let me know and possible rectification or tests

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This and your stalling issue both need looking at with Freescan!


British Ambassador to Florida, New York, Denmark and Newfoundland.  And Sweden.

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First of all, check the actual temperature with Freescan or Espritmon. The gauge isn't always that accurate. A bad connection to the sender will also cause a low reading. The ECM (and thus the readings in Freescan/Espritmon) uses a different sensor.

The thermostat opens at 82°C, so under normal running conditions you'd expect temperature around 82°C. Which is exactly what mine did. Once in traffic for some time (you're not the only one commuting in your Esprit ;) ) it rises, till you start moving again or the fans come on. If you have the A/C on, the fans will also run, and this could/should be enough to keep temperature down. If you don't have A/C, I'd check to make sure the fans aren't running all the time. Otherwise, just be happy she's running nice and cool and keep enjoying her!

Don't want to hijack your thread, but lately my temperature has been behaving a bit strangely. Both the gauge and values in Espritmon. When running at any speed, temp stays just under 80°C, instead of the usual 82°C. Once in traffic, it seems to rise faster than it did, and take longer to come down when the fans kick in. We are having some hot weather, but nothing extreme. It almost seems the thermostat isn't fully closing or opening, but stuck halfway. I wonder if this could be related to the few temperature spikes I had a few months ago. Those were due to steam pockets, because I had a (hard to find) leak in the hose between manifold and water pump. Oil temperature never rose much and since replacing the hose no water loss whatsoever, so I'm convinced no damage was done. But could it have caused the thermostat to stick?

Greetz,

Filip 


I have made many mistakes in my life. Buying a multiple Lotus is not one of them.

 

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I've replaced my Esprit's thermostat many times!

 

(Not a few, not several, but MANY.)  I've used different brands same results.

 

 

After a few years they don't close all the way. (At least, the engine doesn't overheat.)


Atwell Haines

'88 Esprit

Succasunna, NJ USA

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Yeah, I've thought about just replacing the thermostat to be sure. But not really in the mood to drain, refill and bleed coolant again...

And I don't think an open thermostat could account for the low temperature the OP has in traffic.


I have made many mistakes in my life. Buying a multiple Lotus is not one of them.

 

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1 hour ago, Escape said:

Yeah, I've thought about just replacing the thermostat to be sure. But not really in the mood to drain, refill and bleed coolant again...

You don't need to as it's at the highest point of the engine, just unbolt the housing & you'll loose no more than a cup full. :thumbup:

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Cheers,

John W

http://jonwatkins.co.uk

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Run it for a while without a thermostatic valve in place and see if it makes a difference - you won't notice much change while the weather warm, and put a low temperature valve in place say, September?

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^^^ Don't do that.

 

The Esprit T-stat incorporates a block for a coolant bypass circuit.  (that plate on the bottom of the 'stat)  When the 'stat opens, it blocks the coolant at the bottom.

 

The better thermostats have a 'jiggle pin' in their shrouds, which lets air bubbles escape.

esprit thermostat.jpg


Atwell Haines

'88 Esprit

Succasunna, NJ USA

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Totally agree @CarBuff

My Excel came without a thermostat, definitely a bad idea! Not only did it take too long to warm up, with little or no heater, cooling was also inadequate at low speeds because of the reduced coolant flow through the radiator (a lot being lost through the bypass that remains open).

Filip


I have made many mistakes in my life. Buying a multiple Lotus is not one of them.

 

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Just wanted to add, today I finally got round to fitting a new thermostat. With the weather getting colder, I figured the engine could only benefit from getting up to proper operating temperature and I wont mind the heater being a bit more effective either (nor will my missus!). Result, normal temperature back to before the overheating, just above 80°C. 🙂

I did struggle a bit to get to the bolts without disturbing the cambelt. And despite putting the front as high as it would go (front axle on the lift, rear on the floor), I did loose quite a bit of coolant. But little or no air could get in, so I don't expect it will need more than a little top-up in the morning.

Filip


I have made many mistakes in my life. Buying a multiple Lotus is not one of them.

 

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Freescan is showing temp is 80... dash temp is 65ish

 

I found the ecm coolant temp sensor A910E6928F. Where is the dash temp sender ? I looked in the parts manual and it is referred to as 03a/A082N6075F but isn't shown in any diagrams!

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Is it not the one on the thermostat housing ?


Only here once

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12 hours ago, Barrykearley said:

Is it not the one on the thermostat housing ?

Yes ! It is in the diagrams as "refer to 17.07" which is the page for dashboard dials !

 

A bit "dan brown" in tracking it down... at least i didn't have to run around an Italian city.

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