Help, heater hot when moving but cold when in traffic?

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BIG MATT

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Coventry
As the title suggests, temp gauge is at normal half way point but inside can be blowing warm but only when moving, after 2 mions in standing traffic it blows cold, this rights itself again in a few seconds when moving, is me V/fan, how do i check?

2001 td5 auto

Chers guys
 
thermostat sticking open possibly-look at temp gauge if it drops then most likely
 
WOW ! fast reply, thanks.

Temp gauge stays firm at half way point as many years ago it ran out of coolant and went into limp home, one HG later im paraniod about water levels and temp so i watch this all the time.

Cheers tho
 
another if not loosing water or pressurizing is water pump impeller maybe
 
BIG MATT said:
As the title suggests, temp gauge is at normal half way point but inside can be blowing warm but only when moving, after 2 mions in standing traffic it blows cold, this rights itself again in a few seconds when moving, is me V/fan, how do i check?

2001 td5 auto

Cheers guys
Click to expand...

Next time you go out for a run, when you stop the engine open the bonnet and see if the viscous fan turns easily, or is stuck on? If it's permanently on it will be over cooling the coolant so affecting the heater, on tickover. As soon as you're driving again there will be more heat which will compensate.

Dave
 
I had my heater going cooler on me once last week, with thick snow and moving a 10mph the heater started to get cooler the heater fan was on 4 so I move it back to 2 and the heater got hot again.
What the fan was doing is when no.4 sucking in more very cold air than the poor matrix could deal with, air was also being sucked through a snowed over air intake . Temps are just -2c so now no such problems.

Also happened with my old RRC so nothing new.
 
Last edited:
Ok did some checks as suggested, first on the way home from work when engine was at running temp (half way on gauge) i turned the fans down in stationery traffic but it still blew cooler air than when moving.

When at home i checked the fan, it turned both ways with a little resistance, is this right?

Will silver foil over the grill help used to do this on my first car (metro)

I think some thing is wrong some where as these cars have great heaters and should have the ability to drive to the north bloody pole in extreme temps.

Any help much appreciated.
 
Thanks again for help, will there be any damage if i run her without doing this for a few weeks, no time or ££'s this side of Chrimbo.
 
Going home last night mine was running at about a third of the way up so I flicked the heater off & it went up to halfway,back on again & it's back down to a third.
My take is the heater is overcooling the engine so it's running cold.
Try turning the heat setting down & see if stays at that temp.

gran.
 
I had the same symptoms in the snow at the beginning of this year. After a quick check, I'd been driving around with NO coolant!!

Luckily all seems ok now and I check the level like a hawk. Only thing i've been left with is I have had to take the fuse out for the AC fan as it kicked in automatically to 'save' the engine and I couldn't/cant switch it off.
 
broadoakboy said:
I had the same symptoms in the snow at the beginning of this year. After a quick check, I'd been driving around with NO coolant!!

Luckily all seems ok now and I check the level like a hawk. Only thing i've been left with is I have had to take the fuse out for the AC fan as it kicked in automatically to 'save' the engine and I couldn't/cant switch it off.
Click to expand...


If you can find someone local to you with a Hawkeye or Nanocom it'll take them about 30 secs to turn off "forced fan assist" in the EMS menu.

Dave
 
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