Strange overheating problem
#1
Scooby Newbie
Thread Starter
Join Date: Feb 2017
Location: Worcester
Posts: 2
Likes: 0
Received 0 Likes
on
0 Posts
Strange overheating problem
Just bought my first Impreza (2006 hawkeye wrx 2.5)
Thought I had been royally done over, however now I think there is probably a simple explanation
Symptoms
-Engine stays in middle of gauge when driving above 3k no problem, blower in cab gives out warm air
- drop below 2.5k for 20-30 seconds and gauge shoots up and heater blows cold.
- revving engine gets up relieves problem(no load) or simply acceleration under load also clears problem.
- everything seems normal under radiator cap.
- expansion tank is a almost full ?
I suspect that this is an air block somehow, however have never encountered an intermittent air lock like this before.
Anyone had a problem like this?
Thought I had been royally done over, however now I think there is probably a simple explanation
Symptoms
-Engine stays in middle of gauge when driving above 3k no problem, blower in cab gives out warm air
- drop below 2.5k for 20-30 seconds and gauge shoots up and heater blows cold.
- revving engine gets up relieves problem(no load) or simply acceleration under load also clears problem.
- everything seems normal under radiator cap.
- expansion tank is a almost full ?
I suspect that this is an air block somehow, however have never encountered an intermittent air lock like this before.
Anyone had a problem like this?
#3
Scooby Newbie
Thread Starter
Join Date: Feb 2017
Location: Worcester
Posts: 2
Likes: 0
Received 0 Likes
on
0 Posts
I will get a sniff test done asap
However, I really don't see how it could be the head gasket.
All the experiences of head gasket failure I've had the misfortune to encounter get worse with RPM and load
Never the other way round, also the heater matrix doesn't stop working inexplicably then start working again.
There is no oil in the coolant and no bubbling
Any other ideas
However, I really don't see how it could be the head gasket.
All the experiences of head gasket failure I've had the misfortune to encounter get worse with RPM and load
Never the other way round, also the heater matrix doesn't stop working inexplicably then start working again.
There is no oil in the coolant and no bubbling
Any other ideas
#6
Scooby Regular
iTrader: (1)
Possibly an air lock - make sure the overflow hose is actually sat under the coolant level in the overflow plastic bottle at the side of the radiator otherwise it can suck air into the system.
Make sure the rad cap and header tank caps havent been swapped over - header tank cap has the vacuum valve on it.
Do you get a water rushing noise when starting from cold from behind the glovebox ?
Mick
Make sure the rad cap and header tank caps havent been swapped over - header tank cap has the vacuum valve on it.
Do you get a water rushing noise when starting from cold from behind the glovebox ?
Mick
#7
Scooby Regular
Join Date: Oct 2008
Location: a house!
Posts: 52
Likes: 0
Received 0 Likes
on
0 Posts
i had this problem after doing a radiator in my old scooby, kept overheating, and after a while i figured out it was an air lock up at turbo, i took turbo water pipe off and filled the pipe up, stuck it back on and never had a problem again, hope its something simple mate