dimbers

Active Member

• Dec 27, 2015

• #1

For the past few weeks ive noticed that when at idle the heater goes cold until driven then it will heat up again.

Today after driving only 2 mile i noticed that the temp gauge had gone up to just above half way, not much but it always stays at half way.

I put heaters on full and slowed down which then the needle dripped back to where it should be.

Any ideas in the cause?

I have water in the expansion tank

 

Kwakerman

Well-Known Member

• Dec 27, 2015

• #2

Some water pumps have plastic impellers which can crack or become loose on the shaft with the result that the pump doesn't work very well (but it doesn't leak) at low rpm and only gets marginally better at higher rpm. I think the TD5 pump normally has a metal impeller (however not sure if all pattern part manufacturers do). Wouldn't think it would be the radiator blocked or stuck thermostat as that shouldn't cause the heater issue. I'm sure some of the TD5 experts will be here soon.

 

M

Mark Ormond

Active Member

• Dec 28, 2015

• #3

2 miles it warmed up quiet quick for aTD5, mines about 4
Needle position just a nats above half for the last 10 years, put the heater on full and trundling round town needle drops well down.
It sounds normal to me, apart from 2 mile too temp were you booting it

 

jamesmartin

Well-Known Member

• Dec 28, 2015

• #4

dimbers said:

For the past few weeks ive noticed that when at idle the heater goes cold until driven then it will heat up again.

Today after driving only 2 mile i noticed that the temp gauge had gone up to just above half way, not much but it always stays at half way.

I put heaters on full and slowed down which then the needle dripped back to where it should be.

Any ideas in the cause?

I have water in the expansion tank

Click to expand...

expansion tank level doesnt necessarily indicate level in the system you must remove bleed screw to ensure engines full

 

gazman

Well-Known Member

• Dec 28, 2015

• #5

Mine heats up in around 2 miles at which point it starts reading. Then it comes up to temp quite quickly.
Mine also calls when stationary so I slow the fan down

 

dimbers

Active Member

• Dec 29, 2015

• #6

Thanks for the replys

Went out this morning to check levels when cold. The coolant was low so i topped it up and bled the system. Took a bit longer to get up to temp than it had recently but i now have heaters that are hot at idle.

I did keep checking the bleed screw and noticed that when i opened it i was getting a white froth of tiny bubbles coming out, no big bubbles though. If i left it open to get rid of the froth the next time i checked i had the same again. Could this be a sign its pulling in air from somewhere?

 

jamesmartin

Well-Known Member

• Dec 29, 2015

• #7

dimbers said:

Thanks for the replys

Went out this morning to check levels when cold. The coolant was low so i topped it up and bled the system. Took a bit longer to get up to temp than it had recently but i now have heaters that are hot at idle.

I did keep checking the bleed screw and noticed that when i opened it i was getting a white froth of tiny bubbles coming out, no big bubbles though. If i left it open to get rid of the froth the next time i checked i had the same again. Could this be a sign its pulling in air from somewhere?

Click to expand...

or theres air in there already ,you need to check it when engines not running

 

dimbers

Active Member

• Dec 29, 2015

• #8

Up to temp or cold?

 

jamesmartin

Well-Known Member

• Dec 29, 2015

• #9

cold

 

dimbers

Active Member

• Dec 29, 2015

• #10

Thanks, will leave and recheck when cold. Appreciate the advice