Air con. works fine, o.a.t. guage seems accurate, level in header tank on the mark, normal engine operating temp, have disconnected and reconnected battery to restore settings? still no heat. Any suggestions?
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Re: can get no heat
If the car is a 2000-2003 then first of all by disconenecting the battery you sometimes have to reprogram the heater control panel. This is done by running the a/c fans on hi and temp on lowest setting, then press and hold the temp settings to hot and continue to hold 10 seconds after it reaches max, then back to cold and hold for 10 secs, back to hot and hold for 10 secs then back to cold.
If this does not fix the problem then more and likely the car is going to need a heater control valve which is located on the right front lower corner of the radiator.
In replacing the heater valve you should also take off the heater pipes (quick connect) going into the heater matric and flush the system through, the system with time gets clogged and can prevent the coolant to flow freely and can also damage the heater pump assy which is next to the heater valve.
Hope this helps
Thanks and good luck
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These can give lots of trouble trying to bleed the air out of the cooling system, and can cause major damage if air is not completely removed before driving the car. Theres a couple of things you can do. Firstly jack the car up on 1 side, so the header tank (coolant filling point) it at the highest point. Fill the coolant up and start the vehicle. Let the engine run for a good 15 minutes with the cap off, when the engine has reached operating temp it should take a little bit more coolant . Feel the bottom radiator hose, make sure is quite warm to touch, this will tell you that you have flow n that the thermostate has opened. Next turn the heater on full hot n make sure u have warm air coming out. Refit cap to header tank. And lower vehicle back down. Test drive the vehicle without going to far. Make sure the temp gauge is at its normal position (bout the middle of the gauge) . You should have all the air out. But to be sure, its a gud idea to get it to operating temp. Then park it up over night and recheck the coolant level in the morning before starting.
I hope this helps
Most systems work this way: temp sensor on engine sends a signal to the computer which in turn sends signal to blower relay that then sends signal to the fan. Any problem along the way, and the fan won't come on.
When the engine temp looks normal on the gauge but you get no heat inside unless your keeping the RPMs up by driving it,It usually means the fluid in the radiator is very low.wait until it is cooled completely and remove the radiator cap and fill completely,Check resovour and fill to correct level,
some of the factory gauges aren't very accurate if the fluid level is good and you get good heat inside I wouldn't worry about it, but I would keep an eye on it to make sure it doesn't over heat. If your still worried I would go to an auto parts store and pick up a temp. gauge there perty easy to install
It sounds normal, but perhaps the radiator is a little small. Make sure the core is clean by blowing it out with compressed air (from the engine side) to clear out bugs and other debris. Make sure the overflow/reserve tank is at the proper level. Check the coolant level in the radiator when engine cold--it should be right at the top of the filler. These are all preventive, not a cure for anything.
you have air trapped in the system.
Park facing uphill (on car ramps if you have them).
with cold engine, remove radaitor cap and fill radiator.
leave cap on loose.
Turn on heater.
start engine and run until upper radiator hose gets hot (meaning thermostat has opened).
Check coolant level and top off. Repeat until temp gauage reads normal and heat is coming from heater ducts.
You may have an air pocket in your system which some times happens. One way to get rid of it is to take the upper hose off on the engine side, fill your system with water until it runs out from your engine block, replace the hose, start your car turn you heater on and set to hi keep the radiator cap loose until the temp start to rise then close tight. Once the air pocket had been remover you can drain some of the water from the radiator using the lower drain plug and add antifreeze.
You have air in the cooling system, it needs bleeding, this is best done from the heater hoses. you cannot have a heating or cooling sysem that is not pressurised. no water no heater no demister no temp guage