Thanks for getting back so quickly. As for the air bubble, how would I go about getting that out? Also, why will the bottom radiator not get hot after driving for a while? Finally, I forgot to mention that the one heater hose gets hot but the other one is only warm after driving for quite a distance. I am hoping the water pump is not the problem. It looks like a real bear to change.
I just got the water pump off and it looks fine. The seal is not leaking and the inpellers are in good shape and not loose on the shaft. However, since there is so much time involved in getting the pump off, I am going to put on a new one tomorrow. Any other suggestions would be greatly appreciated. One other thing I noticed is when I had the front of the car raised and running it to try to get any bubbles out of the heater, The engine cooling fans both came on yet the lower radiator hose was still cold. Also, when I took out the old thermostat to put in a new one, when I removed the thermostat housing, very little antifreeze ran out. I don't know if this is due to me emptying the radiator first or something else is going on. When I removed the water pump, a lot of antifreeze came out.
Thanks again and talk with you tomorrow.
Thanks for the info and the picture. Tomorrow or as soon as I can, I'll pressure test and also run a test for combustion gasses in the antifreeze. While I'm at it, I was going to take out the thermostat and see if water circulates with it out. While it is out, I'll have the entire cooling system backflushed. One thing I did notice was looking in the radiator neck there was a large piece and smaller pieces of what looked like a soft cork material. I'm wondering if this is blocking water flow somewhere.
I'll let you know what I find. Thanks and have a good evening
I just read where there is a water temperature sensor or solenoid on the heater core and if it is bad, it will not allow hot water to flow through the heater core. Is this so and if so, where is it, how much of a job is it to check it and replace if needed?
Thanks again for all the time and effort you are putting into this problem. I really appreciate it.
Thanks for the information. I wanted to check with you first before I go hunting a non-existing part. Regarding the picture, is this view looking straight in through the glove box opening? Also, what is the purpose of this switch. Is it only related to the A/C or does it control something related to heat?
When I remove the glove box and look in, there are not any switches or connectors to be seen. There is one on the bottom of the heater box going up into the heater box. I would think this is related to the A/C though. Is your diagram of a 2001 Hyundai Elantra? Just wanted to check. I have a cleaner in the cooling system and thew thermostat out at this point and drove about 1 hour yesterday. I checked the water level this AM and it was still up in the radiator neck but really dirty. The cleaner is to be left in for 3 - 6 hours total. I'll drive it today some more. When I had the heater hoses disconnected from the tubes going into the thermostat housing and blew through each hose, it was fairly hard to blow through them. I'm hoping the heater core is plugged and the cleaner will loosen up the dirt. I'll let you know after I drive more today.
When I look at the heater etc through the glove box door, there are no wires, switches or anything like that visible.
Earlier I did back flush the heater core in both directions but when I removed the thermostat housing, the coating inside was tan looking and very waxy and sticky. I'm thinking back flushing may not have gotten rid of all of it or maybe not hardly any in the heater core.. I'll see what the chemical cleaner does.
Talk to you after I drive it some more.
Put in a cleaner, Prestone, and drove car 5 hours. No success. Then I got a cleaner made by Gunk. Drained heater core, left both heater hoses attached to the heater. Removed other ends of both hoses from the tubes on the thermostat housing and raised these ends above the heater core. Poured Gunk cleaner in one hose and added water until cleaner started to come out other hose. Left this sit 4 hours and back flushed heater core in both directions. Next backflushed block and radiator in both directions. Water would not come out of tube on the thermostat housing that has a hose attached to the outlet of the heater core. Flushed water directly into this tube about 20 times and heard a thud. Back flushed block and radiator again and this time water came out the tube previously blocked. Now I am getting fairly good heat driving and still some heat when sitting still. As far as I'm concerned that is OK. The car is my daughter's car and has 190,000 + miles on it and she will be getting another one when she graduates from college this spring.
Thanks so much for all your help and suggestions.
The best to you and your family this Holiday season.