anyone good with VW's
Discussion
Hi guys/gals
I was wondering if maybe somebody could help me sort out this problem on girlfriends car, seems even when temp guage is well up to norm and even though blower is running fine and it seems the cold to hot selector dial is actually working, sounds like the flap is moving or whatever is in there is changing anyway as switching back from hot to cold brings fresh air into car, switching back to hot setting with blower running at any speed produces very little if not any heated air either when set to direct up to window or to footwells or generally through air vents, I've removed carefully the flow and return water hoses ( don't know which is which, but suspect right one as looking in from front is supply ) correct me if I'm wrong, there's hot (really hot!!) water flowing out of one on right, and builds up at left if hose slightly opened as if to bleed, I suspect this is return but isn't returning ( think this the problem!!???, is there a device , thermostat which enables return flow maybe??.....I'm lost from here, any help greatly appreciated, oh ya it's a 1.0 ltr 1999 vw polo, engine running fine, and hot enough, thanks in advance for any assistance and for reading this.
I was wondering if maybe somebody could help me sort out this problem on girlfriends car, seems even when temp guage is well up to norm and even though blower is running fine and it seems the cold to hot selector dial is actually working, sounds like the flap is moving or whatever is in there is changing anyway as switching back from hot to cold brings fresh air into car, switching back to hot setting with blower running at any speed produces very little if not any heated air either when set to direct up to window or to footwells or generally through air vents, I've removed carefully the flow and return water hoses ( don't know which is which, but suspect right one as looking in from front is supply ) correct me if I'm wrong, there's hot (really hot!!) water flowing out of one on right, and builds up at left if hose slightly opened as if to bleed, I suspect this is return but isn't returning ( think this the problem!!???, is there a device , thermostat which enables return flow maybe??.....I'm lost from here, any help greatly appreciated, oh ya it's a 1.0 ltr 1999 vw polo, engine running fine, and hot enough, thanks in advance for any assistance and for reading this.
Alot of modern cars have a heater control valve on the heater hoses that bring hot water to and return hot water from, the heater core. Not sure if VW uses one but your symptom sure sounds like a bad heater control valve. Sorry, best I can do as a Jaguar/Ford factory trained technician with little experience.
One thing work checking is the water pump.
VW usually use a plastic impeller moulded onto the shaft and it can split and stop turning so in fact the water isn't pumped around the engine. I had this on a 1996 1.4 Polo
However there is enough thermo cycling to keep the engine running at the correct temperature, you could drive around in the winter no problem.
I only knew there was a problem because the GF complained that her hands were cold and the interior heating wasn't working very well.
It took a while to fathom out what was wrong as it would idle indefinitely without overheating.
A new pump fixed it. The other thing that needs looking at is the thermostat as it can collapse and give similar problems.
Hilly
VW usually use a plastic impeller moulded onto the shaft and it can split and stop turning so in fact the water isn't pumped around the engine. I had this on a 1996 1.4 Polo
However there is enough thermo cycling to keep the engine running at the correct temperature, you could drive around in the winter no problem.
I only knew there was a problem because the GF complained that her hands were cold and the interior heating wasn't working very well.
It took a while to fathom out what was wrong as it would idle indefinitely without overheating.
A new pump fixed it. The other thing that needs looking at is the thermostat as it can collapse and give similar problems.
Hilly
hilly said:
One thing work checking is the water pump.
VW usually use a plastic impeller moulded onto the shaft and it can split and stop turning so in fact the water isn't pumped around the engine. I had this on a 1996 1.4 Polo
However there is enough thermo cycling to keep the engine running at the correct temperature, you could drive around in the winter no problem.
I only knew there was a problem because the GF complained that her hands were cold and the interior heating wasn't working very well.
It took a while to fathom out what was wrong as it would idle indefinitely without overheating.
A new pump fixed it. The other thing that needs looking at is the thermostat as it can collapse and give similar problems.
Hilly
Yep,this happens all the time with VW,SVW usually use a plastic impeller moulded onto the shaft and it can split and stop turning so in fact the water isn't pumped around the engine. I had this on a 1996 1.4 Polo
However there is enough thermo cycling to keep the engine running at the correct temperature, you could drive around in the winter no problem.
I only knew there was a problem because the GF complained that her hands were cold and the interior heating wasn't working very well.
It took a while to fathom out what was wrong as it would idle indefinitely without overheating.
A new pump fixed it. The other thing that needs looking at is the thermostat as it can collapse and give similar problems.
Hilly
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