Can anyone help my scooby keeps overheating in traffic as soon as you set of temp starts to go down iv had a new head gasket fitted about 300 miles ago and another thermosat to both top hose and bottom hose look blow up with pressure to and explansion tank starts to fill up also my heat gets hot then go's cold has anyone got a idea what is up with it

 

Could be an airlock.

Do a search for how to bleed/vent the system.

 

Or the coolant level is too low?
Or the pump is on the way out?

 

hi no dont no how to bleed the system could you help me on that and i had a new water pump fitted before head gasket went iv noticed it keeps taking the water from the header tank and putting it in the expansion tank but it dont go back into the header tank as should do i was worry just incase i had a cracked head

 

tak eit back to the guy who did you heads and get them to have a look at it

 

did the heads myself with my mate who is really good with scooby engines

 

Air lock mate, easy to do, take headers cap off, check levels, then run car with cap still off, wait til you see bubbles. this is the air escaping. put cap back on, go for a spin, then let it cool down and check levels again.

 

1. Top up header and expansion tank to correct level.
2. Put heater to full hot.
3. Start engine and leave ticking over.
4. Check the fans are coming in before the needle on the temperature guage starts to rise beyond the normal mark.

Cars with aircon will have two fans and one will operate with the aircon on in any case.
Your fans should be cutting in to pull air through the radiator when the temperature reaches 92-94 C.
Get to the bottom of the problem before you start throwing money at it.
Although we live in an area with good water we do have to replace radiators from time to time as they are furred up so I guess you guys that live where there is a lot of solids in the water like chalk will have to replace radiators far more frequently.