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[SteveT528]

Hi guys, ive removed aircon on two tuned omegas, removed the aircon as it didnt work + when tuning its nice to have all the aircon pipework /pump / rad ect out the way , ive fitted a non aircon aux belt in place.  now they run perfect but instead of the normal 90 ish degrees while driving It now hardly moves from the needle on the guage, the only time it moves is in traffic and goes upto normal temp.

In the summer and racing on the track this will be great im sure but any idea why the engines wont get upto temp?  thermostat? surely not on both cars , they were fine before.

Would be interested in what you all think. cars are 3.0 2001 omega and a 3.2 54 reg omega

[hotel21]

The removal of the condenser means that all airflow now passes through the main engine radiator, without obstruction/heat use.

If stationary in traffic, the airflow is nil and reliant upon the main rad fan.

[SteveT528]

The removal of the condenser means that all airflow now passes through the main engine radiator, without obstruction/heat use.

If stationary in traffic, the airflow is nil and reliant upon the main rad fan.

Thanks for that, i guessed this was the reason, but on the early 2.5 omega with no aircon this was not the case was it , the non aircon 2.5 stayed at a decent temp whats changed?. it cant be good running the engine without it getting upto temp?

[dbr]

Shouldn't the 'stat control the temp?

[SteveT528]

You would think so , every other car ive owned the stat controlled it, even my little run around corsa sits at 90 deg

[ffcgary1]

Check that your red fans are not running at full chat
all the time, the aircon fans are linked into the cooling system and could see a fault and run the fans full on all the time. :-?

[TheBoy]

Stat should control it.  Have you removed AC properly, including the electrical side to stop the fans constantly running?

But does sound like stats to be honest...

[SteveT528]

TheBoy - yeah have removed everything, inluding the two fans infront of the aircon rad, everything to do with AC has been removed , 

there is one thing that hasnt though, there is a 2 pin switch at the top of the rad? im unsure if this would cut the main rad fan in or not? this is still plugged in as i wasnt sure on unplugging it or if it was for the aircon or not?

[TheBoy]

TheBoy - yeah have removed everything, inluding the two fans infront of the aircon rad, everything to do with AC has been removed , 

there is one thing that hasnt though, there is a 2 pin switch at the top of the rad? im unsure if this would cut the main rad fan in or not? this is still plugged in as i wasnt sure on unplugging it or if it was for the aircon or not?

The 2 in front of rad are for cooling iirc, or at least one is.

Given the symptoms, I still think the stat...  ...assuming the gauge/sensor is accurate

[2woody]

Omegas always seem variable from car-to-car to me.

I have a similar car, with an aircon-ectomy already conducted, and yes it does run fairly cool - 80 degrees under normal circumstances, but it did this before the aircon came out.

I'd check the car when it's working flat out before changing anything. My last track Omega ran very cool under all circumstances apart from when on a track, where it would overheat after just a few laps. Diagnosed eventually to a missing front undertray.

Us the wiring diagram to remove all of the redundant wiring, don't just leave spare connectors dangling. You'll be surprised just how much can come out of the relay box and the wiring loom.

[Kevin Wood]

Sounds to me like the thermostat is faulty if it reaches "normal" temperature in traffic but not when moving. Removing the air con condenser has probably just exacerbated this due to better airflow through the radiator.

Does it take a while to warm up after a cold start? Does the top radiator hose start getting warm before the engine is at normal temperature?

Kevin

[Marks DTM Calib]

Shouldn't the 'stat control the temp?

Correct, the stat does control the temp.

The rads are just the means to dump heat to the environment.

So if its not getting hot, then the stat is probably stuck open

[Marks DTM Calib]

Omegas always seem variable from car-to-car to me.

I have a similar car, with an aircon-ectomy already conducted, and yes it does run fairly cool - 80 degrees under normal circumstances, but it did this before the aircon came out.

I'd check the car when it's working flat out before changing anything. My last track Omega ran very cool under all circumstances apart from when on a track, where it would overheat after just a few laps. Diagnosed eventually to a missing front undertray.

Us the wiring diagram to remove all of the redundant wiring, don't just leave spare connectors dangling. You'll be surprised just how much can come out of the relay box and the wiring loom.

TBH, the stats and sensors seem pretty consistant, its the gauges that seem to vary wildly.