General Ulysse - overheating indication

[georgebell]

I have a year 2000 Ulysse and have a problem which remains un-diagnosed. When the air-conditioning compressor is running, the engine overheat light in the water temp guage flashes. Any ideas on what the problem might be ? any help would be much appreciated!

 

[jug]

thats a new one. the compressor must be affecting the (completely seperate) temp sensor circuit. isolate the interference and it should be sorted. finding it is the hard part.

 

[georgebell]

Thanks very much Jug - I'll keep working on it