Thread: Td5 Coolant Usage

Originally Posted by Mundy

... Only seemed to happen when the heater was operating ....

That's very strange cos the D2's heater matrix has constant coolant flow through it regardless of heater/aircon settings, it doesnt have any restrictor or valve to bypass it when heating is not required... so take this into account if it happens again

I had a similar case D2 TD5 today no visible leaks anywhere but was low on coolant so I pressure tested it and it was holding the pressure ok although I did find a tiny pinhole leak from one of the radiator tanks.
topped up the coolant res and went for a drive and it got up to operating temp and was holding. came back into the workshop and checked under the bonnet and the coolant res cap was leaking coolant slowly you can actually hear it bubbling.

Originally Posted by sierrafery

That's very strange cos the D2's heater matrix has constant coolant flow through it regardless of heater/aircon settings, it doesnt have any restrictor or valve to bypass it when heating is not required... so take this into account if it happens again

The flow thru the matrix would be greater when engine cold and main thermostat is closed to rad flow. This may cause a slow weep to increase...

Hi Folks and thanks for all the replies.

Fery. Pretty sure it's not the head as the HG was changed and inspection carried out, but will rule not out completely.

I too had changed to the green stuff only because you can not get the red stuff in Uganda.

I have a new cap here so will swap it over today. Mine seems quite tough to unscrew/screw on?

So it looks like a process of checking each area over time, I have quiet a big trip planned and whilst I feel confident about the car, I know it should not be using coolant.

Will keep updating as I find things out.

Cheers Jerry

Make sure you have both o rings on the cap , if they are both there, you can lube with a light smear of rubber grease , or Vaseline if you don't have any rubber grease

I had a similar problem some time back. Couldn't find a leak, ended up taking the radiator out, getting it pressure tested, 4 leaks found, around the edge. Don't bother trying to fix it, if it is. A new radiator needed. Ideal time to clean the intercooler, & check your hoses. The radiator bleed hose, from the overflow tank to the top of the radiator, is known to harden & crack, as well. It passes under the plastic cover on top of the radiator, out of sight out of mind. Simple things first, Bob