Help Please. Heater Not working - Cold Air Only

ASHEEN · 4th January 2012, 11:13

Hello All,

Re: Rover 75, 1999, CDT (diesel), 162,000 Miles, 2,000 miles since £581 spent on new clutch/dmf/master & slave cylinders, another thing to go wrong! Very frustrating!

My wife has just phoned me to tell me that there is no heat from the vents. It was working fine yesterday.

The only difference between yesterday and today is that the sun has turned up (in Crawley), but is still windy!

Any ideas on how to check and also about cost to replace/repair/fix?

Themostat?
Solenoids under the carpet?
Heater Control Unit (though I think this would be unlikely)

Many thanks,
Ahmed.

Unclefista · 4th January 2012, 11:49

Check coolant level first, if the heat was fine a couple of days ago this is the most likely fault.
If it needs topping up because you're losing it, I'd replace the 2 o-rings on the coolant cap. Worked for me..

Mikebow · 4th January 2012, 11:53

Hi over the past few weeks i have had a similar problem with no heat at the time i was also losing a small amount of water and could not find out if it was leaking or not, after investigation it turned out to be an airlock after curing the airlock problem the heaters worked but was still losing water after a long trip to London and back from my home in Liverpool i had a large water loss and the heaters obviously not working the problem i have found is the O ring seal that is on the upper hose elbow unit at the top of the radiator left hand side as you look from the front so i would first check if you are losing water then check under the unit to see if there is evidence of leaking there should be staining or rust running down the left side of the radiator i hope this is a help

ASHEEN · 6th January 2012, 20:46

Hello All

Sorry, have missed the forum for a few days.

There is no water loss anywhere in my car. Thing is, its taking a much longer time for the heat to start comming through the vents. At best its mildly war, but not blasting hot like it normally is. The temperature gauge struggles to get to the 9'oclock position, and it mostly stays just below the halfway point between 0 and9'o clock.

If its the thermostat, how big a job is it?

Thanks,
A

Mike Noc · 6th January 2012, 21:56

A few hours to replace the original, or you can buy an inline stat and easily fit that instead.

Do make sure you aren't losing water first though, as another common leak point is the thermostat housing itself, and if that is the case, you will have to strip it out anyway to fix the leak.

Mike

4th January 2012, 11:13	#1
ASHEEN Loves to post Rover 75 CDT Connoisseur 165k and still going! Join Date: May 2011 Location: Crawley Posts: 315 Thanks: 0 Thanked 1 Time in 1 Post	Help Please. Heater Not working - Cold Air Only Hello All, Re: Rover 75, 1999, CDT (diesel), 162,000 Miles, 2,000 miles since £581 spent on new clutch/dmf/master & slave cylinders, another thing to go wrong! Very frustrating! My wife has just phoned me to tell me that there is no heat from the vents. It was working fine yesterday. The only difference between yesterday and today is that the sun has turned up (in Crawley), but is still windy! Any ideas on how to check and also about cost to replace/repair/fix? Themostat? Solenoids under the carpet? Heater Control Unit (though I think this would be unlikely) Many thanks, Ahmed. __________________ 165k And Going, AIRBAG LIGHT STILL ON!!!!!!!!!!

4th January 2012, 11:49	#2
Unclefista Posted a thing or two Rover 75 CDT Join Date: Sep 2011 Location: Bradford Posts: 1,478 Thanks: 1 Thanked 14 Times in 8 Posts	Check coolant level first, if the heat was fine a couple of days ago this is the most likely fault. If it needs topping up because you're losing it, I'd replace the 2 o-rings on the coolant cap. Worked for me.. __________________ Love is like a snowmobile, speeding across the frozen tundra. Which suddenly flips, pinning you underneath. At night the ice-weasels come... http://farm6.staticflickr.com/5331/6...77671f80_n.jpg

4th January 2012, 11:53	#3
Mikebow Newbie Rover 75 Saloon Join Date: May 2011 Location: Liverpool Posts: 20 Thanks: 7 Thanked 0 Times in 0 Posts	heaters not working Hi over the past few weeks i have had a similar problem with no heat at the time i was also losing a small amount of water and could not find out if it was leaking or not, after investigation it turned out to be an airlock after curing the airlock problem the heaters worked but was still losing water after a long trip to London and back from my home in Liverpool i had a large water loss and the heaters obviously not working the problem i have found is the O ring seal that is on the upper hose elbow unit at the top of the radiator left hand side as you look from the front so i would first check if you are losing water then check under the unit to see if there is evidence of leaking there should be staining or rust running down the left side of the radiator i hope this is a help

6th January 2012, 20:46	#4
ASHEEN Loves to post Rover 75 CDT Connoisseur 165k and still going! Join Date: May 2011 Location: Crawley Posts: 315 Thanks: 0 Thanked 1 Time in 1 Post	Hello All Sorry, have missed the forum for a few days. There is no water loss anywhere in my car. Thing is, its taking a much longer time for the heat to start comming through the vents. At best its mildly war, but not blasting hot like it normally is. The temperature gauge struggles to get to the 9'oclock position, and it mostly stays just below the halfway point between 0 and9'o clock. If its the thermostat, how big a job is it? Thanks, A __________________ 165k And Going, AIRBAG LIGHT STILL ON!!!!!!!!!!

6th January 2012, 21:56	#5
Mike Noc This is my second home Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,571 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	A few hours to replace the original, or you can buy an inline stat and easily fit that instead. Do make sure you aren't losing water first though, as another common leak point is the thermostat housing itself, and if that is the case, you will have to strip it out anyway to fix the leak. Mike Last edited by Mike Noc; 6th January 2012 at 21:58..