Author |
Topic: Heating works, works not, works... (Read 1004 times) |
|
tlundkvi
Full Member
Ex. Scorpio 2.9 24V -95
Posts: 909
|
 |
Heating works, works not, works...
« on: Jan 28th, 2009, 9:46am » |
 Quote  Modify
|
Hi all,
I have an interesting problem with my 24V. Most often, the heater blows hot air when needed, but sometimes I get only cold air blowing, although temp is on 29 or HI, and it's freezing cold inside. Sometimes, restarting the car immediately restores desired functionality. Although not 100% tested, but the heater not working is more likely when the car is started and idling for a while before I start driving.
I would suspect a fuse or the actual heater matrix normally, but then heating should not work at all, right? Could it be some sort of a relay that is confused?
Is this a known problem? What could be wrong? (AC panel is replaced and working).
Thanks for any help! (just -2 degrees and getting colder  )
|
|
 IP Logged |
|
|
|
tlundkvi
Full Member
Ex. Scorpio 2.9 24V -95
Posts: 909
|
|
Re: Heating works, works not, works...
« Reply #2 on: Jan 29th, 2009, 6:52am » |
Quote Modify
|
on Jan 28th, 2009, 12:13pm, Jonnycab wrote:
Tried a full recalibration, so far it seems to work, have to see for a few days if the problem was fixed by it.
Thanks!
|
|
IP Logged |
|
|
|
tlundkvi
Full Member
Ex. Scorpio 2.9 24V -95
Posts: 909
|
|
Re: Heating works, works not, works...
« Reply #3 on: Feb 9th, 2009, 7:05am » |
Quote Modify
|
on Jan 29th, 2009, 6:52am, tlundkvi wrote:
Tried a full recalibration, so far it seems to work, have to see for a few days if the problem was fixed by it.
Thanks! |
|
Have now done the recalibration twice, the heating still goes on & off all the time. Sometimes when the heating has been on for a while, it starts to blow cold again. Sometimes setting it on OFF and on again helps, but not always. I get no error codes, the only codes I have ever seen on the display are 00, 50 and 52, last time I checked only 00 and 50.
If the heater matrix is broken, there should not be any heat at all, right? How could it possibly even fail? A loose connection to a sensor/element, based on the error code list it should trigger a fault code? Could this have anything to do with coolant?
Only thing I could think of now is the control box. Or a loose connection somewhere...
|
|
IP Logged |
|
|
|
Simmo
Administrator
I'm an OAP !
Posts: 5508
|
|
Re: Heating works, works not, works...
« Reply #4 on: Feb 9th, 2009, 8:00am » |
Quote Modify
|
Have you checked the heater blower control?. Here.
|
|
IP Logged |
Now I'm an OAP
|
|
|
tlundkvi
Full Member
Ex. Scorpio 2.9 24V -95
Posts: 909
|
|
Re: Heating works, works not, works...
« Reply #5 on: Feb 9th, 2009, 8:42am » |
Quote Modify
|
I could do the test, but just to make sure, is this a separate thing from the fan blowing cold air (e.g. controlling hot air coming from the heater matrix)? I ask, because fan speed does not change in any way, I get full range, the system just stops heating blowing freezing cold air into the car. The problem occurs both on auto and manual fan speed. The car has the automatic AC.
|
|
IP Logged |
|
|
|
tlundkvi
Full Member
Ex. Scorpio 2.9 24V -95
Posts: 909
|
|
Re: Heating works, works not, works...
« Reply #7 on: Feb 9th, 2009, 10:53am » |
Quote Modify
|
Does anyone know how exactly the amount of heat is regulated? Is it some form of a regulated valve to the heater matrix (like the thermostats in heater elements in apartments) regulating how much fluid is allowed to circulate?
|
|
IP Logged |
|
|
|
Jonnycab
Senior Member
Former owner of 2.3 Ultima Facelift saloon
Posts: 3900
|
|
Re: Heating works, works not, works...
« Reply #8 on: Feb 9th, 2009, 11:19am » |
Quote Modify
|
There is no regulator valve in the matrix, the only reason that the matrix may go cold is because of a blockage. Have you checked that the matrix outlet hose is consistantly nice & hot like the inlet hose ?
|
|
IP Logged |
|
|
|
Tompion
Administrator
1997 2.3 Ultima estate.
Posts: 2918
|
|
Re: Heating works, works not, works...
« Reply #9 on: Feb 9th, 2009, 12:01pm » |
Quote Modify
|
Further to what Jc says the regulating is done via flaps combining hot & cold air.
|
|
IP Logged |
ABS multiplug wheel sensor pins MK IV or MK 20
|
|
|
wumpster
Full Member
1996 2.5TD Scorpio Exec
 
Posts: 155
|
|
Re: Heating works, works not, works...
« Reply #10 on: Feb 9th, 2009, 6:31pm » |
Quote Modify
|
i once had a simalar problem om me merc it was the temp sensors in the heater box in the end giving a false reading every now and again the scorp does have sensors but cant remember where they are
|
|
IP Logged |
www.thewumpster.co.uk
|
|
|
Simmo
Administrator
I'm an OAP !
Posts: 5508
|
|
Re: Heating works, works not, works...
« Reply #11 on: Feb 9th, 2009, 8:44pm » |
Quote Modify
|
Does THIS help Wumpster. Says they are in the heater housing.
|
|
IP Logged |
Now I'm an OAP
|
|
|
tlundkvi
Full Member
Ex. Scorpio 2.9 24V -95
Posts: 909
|
|
Re: Heating works, works not, works...
« Reply #12 on: Mar 15th, 2009, 6:24pm » |
Quote Modify
|
Problem is solved. It is a bit embarrassing for me to tell, because it's a thing you should check regularly. The reason was low coolant fluid level, approximately 1-1.5 litres low, but enough for the laws of physics to cut out the heater matrix every now and then. Ran a complete flush and changed fluid and now it heats up after a few minutes, even faster than many newer car.
|
|
IP Logged |
|
|
|
tve
Junior Member
Independent service
Posts: 88
|
|
Re: Heating works, works not, works...
« Reply #13 on: Mar 15th, 2009, 9:03pm » |
Quote Modify
|
Bravo! 
|
|
IP Logged |
|
|
|
Simmo
Administrator
I'm an OAP !
Posts: 5508
|
|
Re: Heating works, works not, works...
« Reply #14 on: Mar 15th, 2009, 9:18pm » |
Quote Modify
|
Well done. Good to know that the problem is solved and thanks for letting us know the reason as it may help someone in the future. 
|
|
IP Logged |
Now I'm an OAP
|
|
|
tlundkvi
Full Member
Ex. Scorpio 2.9 24V -95
Posts: 909
|
|
Re: Heating works, works not, works...
« Reply #15 on: Mar 16th, 2009, 6:45am » |
Quote Modify
|
Just to add, if the temperature rises slightly at the same time as the heating stops (need not be on the "red" area), the reason is most probably the coolant or a circulation problem. I was told most cars are like this by design, i.e. the heater matrix has the toughest resistance in the circulation system to protect the engine.
|
|
IP Logged |
|
|
|
|
Home
Help
Search
Members
Login
Reply
Send Topic
Print