Can too much antifreeze cause this?The auto parts store said it could be a clogged heater core [how do you unclog it?]
My 2000 VW Passat has no heat.We changed the thermostat and now it runs hot.What could be wrong? ?
I agree with Mike T. The thermostat is in upside down. Also, if you end up having to remove the heater core, and it is clogged, it would be beneficial to go ahead and replace it while you have it out, because they are a pain in the butt to take out and put back, so why not replace it and solve the problem in case it can't be cleaned out and you would end up just having to take it out again.
My 2000 VW Passat has no heat.We changed the thermostat and now it runs hot.What could be wrong? ?
Water pump. On these cars the impellers are plastic and the blades shear off so you have no coolant flow. The engine gets really hot but the radiator stays cool. Since the temp sensor is in the bottom of the radiator it doesn't tell you the engine is overheating.
Stupid design overall.
Change the Timing Belt at the same time as the Water Pump and hope the Head Gasket isn't blown.
Your antifreeze/water mixture needs to be 50-50.
50% water, and 50% antifreeze. Putting too much antifreeze in the mixture, can cause adverse effects. Getting hotter than it should.
We changed the thermostat? Would that be YOU and someone else?
1.Did you install the thermostat in the proper direction? It only goes one way.
2.Did you bleed the air out of the cooling system? If you didn't you will have trapped air. This causes the engine to overheat, because no coolant is present where it needs to be. It's just one big trapped air bubble!
IF, you and someone else were the one to replace the thermostat, and didn't have a manual present, or may want to check this anyway,
here is some information,
http://www.autozone.com/addVehicleId,259鈥?/a>
This is an online AutoZone repair guide for the VW Passat made in 2000. (Encompasses a few other years also)
Scroll down the page, (About three-fourths the way down) until you come to the heading,
-%26gt; 1996-00 A4 and 1998-00 Passat Models
Read down through there, about the proper way to bleed the air out of the system. (Down under the illustrations, and under -%26gt; To refill:
This air could be trapped for a long time. You must bleed the air out!
3.What antifreeze did you install? Did you match the correct type you're supposed to use? If you just topped the antifreeze off, and used the wrong type, you have contaminated the present antifreeze, and it's no good! There are two types of antifreeze used, according to this AutoZone manual. One is Blue-Green in color, (G11), and one is Red in color (G12) If you installed the everyday Bright Green color stuff, you have contaminated any present antifreeze. It's no good! COMPLETELY drain it, and refill. (You can't use the Yellow stuff either!)
If your Passat uses the G12 antifreeze, and you have installed the wrong antifreeze with it, you'll know it! It'll be Brown in color!
Barring this is not the problem, check your heater valve control. It should be in a circuit of the hoses, that lead from your heater core to your engine. I know this sounds like sketchy information, but I can't find info on where it's located to tell you.
Look for hoses that are about the size of a man's thumb. (3/4 inch Outer Diameter, or 5/8th's inch O.D.)
See if you see any leading from the engine going towards the firewall.
The firewall is the area behind the engine, and below the windshield.
There should be a control valve unit that is screwed into the top, (or bolted on), or side of the engine. This control valve is what lets hot water pass from your engine, through your heater core. Your heater core will probably be under the dash, and you can't see it. It may be on the firewall, and has a box like structure around it. You should see two brass tubes coming out of the firewall, and hoses leading to them.
Follow the hoses back to the engine, and one of them has this control.
Have someone sit inside the car, while it's running, and move the heater control. See if the heater control valve moves a lever on top.
If it doesn't move, there's the source of your problem. Replace it.
You may have a thermostat type heater/AC control in your dash.
When these do not work, the heater control valve won't operate.
('Natch!)
Lastly, you may have a clogged heater core. The heater core looks like a small radiator. It is! Hot water flows through it, and the car's heater fan blows air across it. The heater core is made of copper or aluminum, and has very small tubes inside. If you don't flush your cooling system out once a year, you can get a build-up of calcium deposits from your faucet water. (The manual, does mention it's distilled water ,when the car comes from the factory. That stuff costs bucks! Would be worth it now!)
You'll probably, have to have a pro change the heater core, if this is the problem.
is the thermostat in right? the spring goes into the block. it could be the heater core plugged. if your going to flush the core yourself then take the heater hoses off, get a garden hose and flush out the heater core going back and forth in each nozzle.too much anti-freeze won,t make it overheat, just not enough will do that.also if the fan not working will make it overheat and also a dirty radiator will also make it overheat. anytime you replace something about the cooling system you have to bleed the air out so it can circulate.
This is a common VW problem, VW uses a water pump with a plastic impeller, the impeller cracks and separates from the metal shaft. Its not an easy fix, but you need to replace your water pump. You can upgrade to a metal impeller pump, depending on mileage, I would do the timing belt at the same time, most of the labor to get to the water pump and the timing belt is the same.
you replace it, you can try taking it out and blowing compressed air threw it but your best bet is to get a new one. If you temp is up and still getting cold air thats most likely what it is.
You put the thermostat in upside down.
did you purge your cooling system, you may have a air pocket in you motor. take the rad. cap off and idle the car until it gets norm. temp. the air bubble out.feel your heater hoses to see if there up if they are its not cloged.
