Another NO heat quetion.. - Defender Source
Defender Source  

Go Back   Defender Source > Defender & Series Technical Discussions > Defender Technical Discussions


Reply
 
Thread Tools
  #1  
Old January 12th, 2009, 11:58 PM
tmore
Status: Offline
Tom More
1995 D90
Member
 
Join Date: Apr 2004
Location: Littleton, CO
Posts: 104
Another NO heat quetion..

I have read a lot of the postings on this subject but think that my problem sounds differant.
I have a NAS D90 that was converted to a 300tdi a few years back. My heater was never great in the winters but really never gave me any problems until now. At idle I am getting NO heat at all even when the coolant is at full operating temp, as soon as I start driving the air temp get warmer as soon as I stop at a red light , traffic, etc the air temp from the heater goes cold after a few seconds.
Here is what I have looked at:
New water pump and thermostat
all cables to heater box attached and doors inside box function and seem to seal, no air leaks between box and firewall
heater core solid and clean externally, water seems to flow through fine
No coolant leaks or loss..

What I find surprising is that at idle, both cold and at temp, I have NO coolant flowing through the hoses to my heater core ( I pulled off both lines and rigged a clear tube between the two to observe).. The coolant seems to start to flow at 1500-1800 rpm.

any help is appreciated

Tom
Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old January 13th, 2009, 05:19 AM
GaryBaxter's Avatar
GaryBaxter
Status: Offline
Gary Baxter
None
Member
 
Join Date: Jan 2007
Location: York, ME
Posts: 1,003
Quote:
Originally Posted by tmore
At idle I am getting NO heat at all even when the coolant is at full operating temp, as soon as I start driving the air temp get warmer as soon as I stop at a red light , traffic, etc the air temp from the heater goes cold after a few seconds.
I have the same exact problem but with the V8 engine. When I first start the truck and it comes up to operating temperature, I have hot air from the vents. After driving x amount of time (somewhere around 1/2 an hour,) the air will go cold almost immediately after I stop at a red light or idle for more than a few seconds. The flow is the same just that the air is cold. No change in the temp gauge readings.

I though it might be a lack of air coming through the intake due to not moving but if I rev the engine at idle, the temp from the vents increases.
Reply With Quote
  #3  
Old January 13th, 2009, 06:18 AM
globallandrovers's Avatar
globallandrovers
Status: Offline
Julian Kotting
1999 P38 DT, 1997 LHD 110 CSW
D-90 Source Vendor
 
Join Date: May 2005
Location: Hertford UK, Wilmington, NC, Austin, TX and OH
Posts: 1,522
Registry
The beauties of rover ownership
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Land Rover Defender Specialist. - We ship worldwide.
We are a specialist in TDI re-power conversions, and Crate 'turn key' Land Rover TDI and TD5 engines and Transmissions.
Reply With Quote
Sponsored Links
Advertisement
 
  #4  
Old January 13th, 2009, 06:29 PM
Gren_T's Avatar
Gren_T
Status: Offline
Gren Thomas
1985 90 300tdi auto
Member
 
Join Date: Feb 2005
Location: bridgend, wales , UK
Posts: 413
Hi Tom if there is no coolant flowing through the heater pipes then either the water pump is duff or the feed pipe is blocked, as it is a retro fit engine check that it is correctly plumbed in before replacing the pump.

there are a couple of pics of a 300 tdi in my thread in the the truck build up section that show the heater pipe arrangement.

have fun
Gren
Reply With Quote
  #5  
Old January 13th, 2009, 08:43 PM
tmore
Status: Offline
Tom More
1995 D90
Member
 
Join Date: Apr 2004
Location: Littleton, CO
Posts: 104
Thanks Gren
The pump is new. I confirmed with both new and old pump I do have coolant flowing into the heater at higher rpm but not at idle. I can also drive the vehicle for extended periods without the engine temp exceding 200 deg f...no signs of overheating so i would think that the pump is functioning. I was hoping that it was that something was plugged but was not that lucky.
For grins tonight I borrowed a data logger from work and placed a couple of thremal couples in my heater vents and on the passenger seat to measure some temps.. air temp outside was about 40 deg. the max temp at my defrost vent at full operating temp was 120deg.. when dropping down to idle for traffic or stop lights I would lose about 1 deg every 2-3 seconds bottoming out at about 80 deg while the engine was still at operating temp. I know it really doesnt show anything just thought it would be interesting to see.. i am going to add tc's to the inlet and outlet of the heater core to see the temp drop and add some to where the hose comes off the engine and returns near the radiator..

thanks

Tom
Reply With Quote
  #6  
Old January 14th, 2009, 12:02 PM
Gren_T's Avatar
Gren_T
Status: Offline
Gren Thomas
1985 90 300tdi auto
Member
 
Join Date: Feb 2005
Location: bridgend, wales , UK
Posts: 413
Hi Tom,
what about an air leak in the water system like a leaky cap?, if there was an air leak the cooling system would not build pressure for the water to overcome the rise in height to the heater matrix and displace the air that is in there unless under high rpm.

get a pressure test and see.

I have a home brew pressure tester with an old header bottle cap with a cycle valve in it to allow me to use a bike pump to pressurise the system and a gauge to monitor the system pressure

just an idle thought.

sound like your having fun, the joys of landy ownership

regards

gren
Reply With Quote
  #7  
Old January 14th, 2009, 12:25 PM
evilfij's Avatar
evilfij
Status: Offline
evilfij
I have never seen a rover in person
Member
 
Join Date: Oct 2003
Location: on the internet
Posts: 14,688
Hoses are reversed. There is an inlet and an outlet pipe. I bet you have them backwards.
__________________
*not legal advice*
Reply With Quote
  #8  
Old January 18th, 2009, 11:54 PM
flynn23
Status: Offline
Scott Kozicki
97 NAS D90 SW
Member
 
Join Date: Dec 2006
Location: Nashvegas, TN
Posts: 36
I have a similar problem and it is a leak in the system, much like Gren_T describes. I had a nick in the back of the radiator near the top of the fins, but below the height of the heater hoses. It was a small leak and I crimped the core lines but it's grown and is now openly weeping coolant when the engine revs. This was enough of a leak to drop pressure and probably created some air bubbles in the system too (I get a little bounce in the temp gauge now and then, even after operating for some time).

Sure enough, I checked the pressure and it was low. Barely enough to pull on the overflow reservoir. It is highly likely that this has caused a small fissure in my head gasket as well, since I'm now getting a bit of white smoke out the tailpipe and some water condensing on the oil filler cap. All within about a month's time of getting the nick in the radiator.

Now I'm staring at a weekend of not just replacing the radiator, but also the head gasket before it blows completely. =(
Reply With Quote
Reply

Lower Navigation
Go Back   Defender Source > Defender & Series Technical Discussions > Defender Technical Discussions

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Excessive heat in driver side foot well Chris Vitale Defender Technical Discussions 14 August 23rd, 2008 01:03 AM
Heat Sheild Bowtracer Defender Technical Discussions 14 July 7th, 2007 12:11 AM
Heat insulation blankets kellymoe For Sale - Parts 1 July 13th, 2005 04:54 PM
strange heat issue jabber Defender Technical Discussions 15 March 6th, 2005 05:42 PM
Heat question Campbell Defender Technical Discussions 8 January 3rd, 2005 08:58 PM


All times are GMT -5. The time now is 10:43 PM.


Copyright