Overheating still a problem for Red Bull

David Coulthard continued work with the new Ferrari-powered car at Jerez in Spain on Tuesday but, as well as an electrical problem that cost him vital track time, the team had to make cuts in the bodywork to try and increase airflow to the radiators.

Technical director Mark Smith said: "It was something of a scrappy day. Our priority had been to see if we had solved the cooling problem we encountered at Silverstone and the short answer is that we have not. However, it did not prevent us from running.

"We went for the short term fix of additional holes in the bodywork, and we were able to begin work on seeing how the new car reacts to set-up changes, while also embarking on a tyre test programme that takes into account the fact we will once again be able to change tyres during the races this season."

Coulthard told autosport.com that he believed it was too early to make any specific comments about the promise of the car - as he was awaiting further aerodynamic updates later this week.

"The laps were limited because we had to go through a system check," he said. "It is the first proper test in a more ambient temperature and I suppose we really do not get the proper feeling until we have all the appropriate parts, which should be made available through the course of this week.

"It is difficult to say how the car is until we actually drive it on the edge. Hopefully all these aero parts will arrive this week."