I own a 1.9 GP multijet the only mod is a forge intercooler the car is still under warranty (until the end of march) it was booked in for its first MOT and Service at the end of march but i have brought it forward ASAP (a week on thursday) the problem i am having is:

after about 30 minutes running especially when on the motorway when i go to accelerate or put a load on the engine the temperature gauge moves above normal until its in the red. However the second I take my foot off it returns to normal.

I find it odd that it cools down so quickly, all levels are normal, the car is well looked after and running the recommended coolant.

Any ideas? Head Gasket, Water Pump? i have owned the car a year and a half and never had any problems overheating even when i have been pushing the car.

Once this is sorted and the car is out of warranty i was going to take it to red-dot racing for the remap. any tips on any other mods?

Tom

im not a pro but would a leak in one of the hoses from the intercooler cause this problem as the cold air isnt getting through and all is happening is the turbo is sucking in all the warm air thats not gone through the intercooler?

how long has the forge intercooler been fitted?

T14086 said:

how long has the forge intercooler been fitted?

Click to expand...

its been fitted for about 8 months now and never caused any hassle, and all the fluid levels are remaining the same thats why i thought it may be head or water pump?

if it really does go up and down as fast as you say, I'd suggest it may be a sensor issue rather than an actual overheating issue......

sharkrider said:

if it really does go up and down as fast as you say, I'd suggest it may be a sensor issue rather than an actual overheating issue......

Click to expand...

i thought that but it does it under exactly the same conditions each time (hard driving) if it was a faulty sensor i would have thought it would be more random? i may be wrong though???

any signs of water/radiator leak, have you tried to bleed the cooling system?

00tdolan said:

i thought that but it does it under exactly the same conditions each time (hard driving) if it was a faulty sensor i would have thought it would be more random? i may be wrong though???

Click to expand...

only if it was an intermittent connection rather than a sensor failure, I can't see enough heat being generated to make it go up and down so fast, the turbo only takes a small ammount of coolent compaired to the engine, if the turbo was running too hot, it wouldn't overheat the engine, more likley to go into limp mode.... if the radiator was clogged (I had this in an old uno turbo) it would overheat under hard acceleration and cool down when going gently, but on a very slow cycle, at least 1 minute of very hard driving to start to heat up....

it could possibly be a broken water pump.. a couple of impellers gone (this happens on VAG engines, the water pump has plastic impellers, they break and clog the radiator with bits, and then have poor circulation caused by missing impellers, the popular upgrade is metal impellered water pump at the first cambelt change) but I haven't heard of this problem on fiat engines....

T14086 said:

any signs of water/radiator leak, have you tried to bleed the cooling system?

Click to expand...

an air block could cause a circ problem I suppose, bleeding may help.....