I went to turn on my heater this fall in my 2001 S-Type 3.0 and nothing but cool air comes out, not as cold as outside air, but not hot, like it should be. So far I have checked the heater core hoses when the car was at idle, and up to temp, with the heater on Hi, there is three hoses coming out of the heater core, two smaller ones on top, and one bigger one, on the bottom between the top two. The top two hoses were at 130F, while the bottom hose was at 140F, and the main radiator hose was at 177F. Do you think my heater core could be clogged? i just had my antifreeze changed last year if that helps. And if this is whats wrong with it, how do i go about flushing it out?? Thank you vary much for any thoughts!

 

Jaguar9891 welcome to the forums.

I hate to give this answer, but if you search the forums you will find more heater related threads than you can shake a stick at.
Have a read and see if they give you any ideas, then fire off any further questions.

 

searched around and all I can guess it is myself is possibly the DCCV? It doesn't blow warm at all unless you let the car sit running and not moving for awhile and then its just barely warm... I dont use the auto setting ever and some posts suggested that unless the valve is exercised it will lock up.. do you think mine may be locked in the closed position?

 

It is a common problem but lets do some more trouble shooting first?

Check your coolant level. A low level can cause a lack of heat.

Can you rev the engine with the car stopped in neutral/park to 2000 rpm and hold it there with the heater running. If you now get heat you need to replace the AUX coolant pump. If no change THEN I would recomend changing the DCCV. The AUX pump is directly under the DCCV on the passenger side of the car. If you have a LHD car. Please change the coolant and flush the system your car has a few years on it and most likely has not had proper service!!
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Another thing to check, no change that to change, is the thermostat while your at it. In past cars a lack of heat was helped by doing the thermostat. It would be a simple and inexpensive thing to do while you were in there.

 

I don't think the 3.0 has an aux pump, does it?

 

heater core can be clogged, low on coolant, or an air lock, thermostat faulty.

 

First of all i want to say thanks for everyones help on this!... But so far iv checked all the things you guys said to check and still no heat, i did however check one more thing last night, i opend up the heater core bleeder hose, with the car and heater on, and only a little bit of coolant came out then stoped. Does anyone know what that means? Thank again guys..

 

I would say.... "What he said"...

With the additional advise to change the thermostat first. It is a cheap and easy thing to do. I would also plan on flushing the cooling system as well. Do you have the JTIS manual? If not, do a search here for the precautions to take when flushing the system. Since it is a pressurized cooling system, it will need to be bled after a flush and thermostat change. Again, not to hard, nor is it very expensive. If that doesn't fix it, I would then start looking at the more expensive components like the heater core and the Dual Climate Control Valve. One other question. Is the air coming out of the vents the same temperature from left to right?

 

yup all the vents are blowing the same temperature... If the thermostat was faulty, wouldnt my car be over heating? just wondering, and should i stop driving it tell its fixed? Thanks..

 

Not necessarily. I had a Chevy Monte Carlo years ago that did it. So did a Cavalier of mine. I haven't had a car in recent years do it, but had a few way back that did. Thing with a thermostat is it is one of those components (like a PVC valve) that should be a service item but is usually ignored until it fails. A thermostat will also degrade before it fails entirely. Again, if it was my car, I would do the flush and thermostat, then take it from there. If the car isn't heating up now, it should be fine. The even temperature is good. There have been some people that reported problems with the climate control system, either bad sensors or controllers, but a symptom of that is different temperature air from one side to the other. I think yours is a simple issue. But, could be off...

 

hope you dont have a head gasket problem. check and see if there is coolant in the oil

 

ok so i changed the thermostat and flushed the coolant, we started up the car to bleed the coolant, opened the front bleeder and rev the engine tell coolant came out, shut that one and waited tell it got up to temp, and its like the thermostat never opened, cuz the car went above normal temp, and the fans came on but it woldnt cool off, and to top it all off i ended up breaking the bleeder on the front of the engine, does anyone know how much that piece cost, and whare i should go from here??? thanks

 

I hate to say it. Please don't take it the wrong way. I would definitely get the car to a dealer.

 

Why are you revving the engine? Let the car idle while filling and bleeding the cooling system. You will need to let it get warmed up and then shut it down and let it cool. This will draw in more coolant. Then top it off and get the car warm again. If the car gets hot very quickly that is usually caused by an air bubble. It will pass. You will have to get the part you broke from the dealer. It is very hard to find a junk yard with any S Types!
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ok so i got the new part on, but still having some truble bleeding the air from the coolant, its like my thermostat is not coming open, the weird thing is that the car is not over heating, but the bottom radiator hose never gets hot, so i kno its not opening... Any ideas?

 

I'm going to shoot in the dark here.... Where did you get the thermostat? Are you absolutely sure they sold you the correct one?

 

Ya im pritty sure its the rite one, its a 195F thermostat, and the same was stamped rite on the old one... But last night after getting the car hot and cold a few times, and adding coolant as needed, the thermostat ended up opening, but its like it opens to late, cuz the fans still came on wile test driving it, and stayed on for ah bit after i shut it off....