The A/C seems to still engage as it causes a drag on the engine, but there is no output of air when I turn the fan on. How can I remove the front panel and check power to the fan motor? 1996 Mercury Sable Thanks.
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Re: A/C and heater fan
If there is no output of air then you are right in replacing the fan motor. It will not just be the air filter if there is no output of air. You are on the right track. Hayne's manuals work as excellent guides in disassembling your vehicle. You can find them used on eBay or new for about $20.00 in most auto parts store. The manual will have photos to help guide you along with step by step instructions.
It is also handy to have it with you while working on the car to refer back to
If you cannot find one for your make and model, look for one for the Ford Taurus for the same year. It should be roughly the same.
a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
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More then likely the valve is open on the heater hose , there are two small hoses running from the engine radiator to the heater radiator , one has a valve or tap that is open to heat and closed when the air con is engaged, make sure it's not frozen open.
It is likely that the heater core has sprung a leak, or the hoses leading to the heater core have failed. This would cause a loss of coolant that would make the coolant temperature sensor think it wasn't necessary to turn the fan on, and would cause steam to appear to rise out of the back of the engine. If you turn the heater on inside the passenger compartment and get steam through the vents, it's DEFINITELY a heater core breach. Otherwise, check the hoses leading to the heater core and make sure they are still connected and not leaking. Good luck!
That is pretty much normal, the heater blower fan acts like the radiator does and helps cool the water passing through it by extracting the heat from it. then once the car inside temp warms up it goes back to normal. Nothing to worry about.
This is pretty much normal as the AC engages and disengages. Though it should be subtle and not erratic. Is it causing your engine to stall? Does your AC work efficiently or is the air not real cold. It should output around 40 degrees. The compressor may be going out or it needs oil. When the AC turns on the car idle sensor should raise the idle so the AC does not drag the idle down too far. If you turn AC off and try pounding on the brake & turning the wheel violently at the same time (in park of course) if you still have an erratic idle it's not the compressor. It will probably be the IAC or a vacuum leak is suspect.
Hi Roger, I believe that you have more than one possible problem. The first is if the belt is not tight enough it will squeak. If the vacuum tubing to the relays controlling the up idle are broken or leaking the up idle will not work and as the drag caused when engaging the AC is substantial the engine revs will drop or can cause the engine to stall. If there is a problem with the AC compressor, it can also cause the symptoms you're reporting. The sound of the fan operating will increase with the volume of air circulated, which is normal, but I'm not sure what sound you're referring to? Regards John
Sounds like you have an air conditioning compressor tying up. The compressor does not engage when the fan is turned all the way off. If you turn your heater control away from the ac setting (keeping in mind the ac comes on automatically when in defrost mode) and it does not have those symptoms, that is where your problem is.
either the fan on the front isnt coming on when AC engaged or another reason could be its overcharged with R134 so when Ac is on the compressor is srtaining but you would notice engine slow down when AC engaged if this was the case .,If both first causes seem to be ok then take bottom hose off and flush cooling system using a heater hose connection and reverse the flow a few ,garden hos perfect for this ,then refill with a 50% antifreeze solution and see what happens
is your heater set on defrost this will cause your engine fan to run because it turns on the compressor for air conditioner this helps to extract moisture from your warm air defrost and the fan in the engine compartment helps keep it the engine cool from the extra load on the engine this is normal
With the engine off, radio too, turn the key on and try the heater fan on all speeds. No fan, check the fuses. Fan is ok, check the coolant level, if thats fine, then check for a mouse nest in the duct work. Frankster016