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VW Passat 1.9 tdi 1999 10200 miles.Heater matrix problem I think(no heat),the car had a leak on the main cooling rad so a mechanic put some sealant in last year.More info the car has had a new thermostat/water pump and been flushed the heat control knobe is working I can feel the valve arm moving i have not checked the heater valve to see if it is sezied.The pipes to the bulk head are both warm/hot I am trying to avoid pulling the dash out or some one esle to do it .Any tips or hints please ****

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6ya6ya
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Posted on Jan 02, 2017

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  • 35 Answers

SOURCE: '94 grand am cooling system failure

What engine do you have? One noted problem with the 4 cylinder engines is the reliability that at some point the intake will crack. I went through all the same things when I bought my 93. Drove off the lot, started overheating, replaced the thermostat and still had the problem without moving from the driveway. Look all around the intake. Make sure car is full of coolant and have the engine running. Most likely you will see a small coolant leak on the backside by the firewall. These cars were known for this problem. By the way if this is the problem make sure you take it to a reputable mechanic, make sure you get a new one installed. I had a used one and had the car back in the shop the next day. It then sat there for 2 more weeks while the used car dealer and I had a "discussion".

Posted on Jan 07, 2009

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Thunder55
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SOURCE: engine overheats when heater pipes connected

I think you could be right about there being air trapped in the system.
Or the heater core(radiator) is plugged.
Either way you need a pressurized radiator coolant pump to put the coolant in without air being trapped.
Although,i have seen it done by jacking the vehicle up high enough that the radiator was now higher than the heater core level, and then the coolant was put in.
But this is dangerous to try.

Posted on Jan 29, 2009

  • 1 Answer

SOURCE: hi i have a renault scenic 1.9 dti and there is no

hi all i have fixed the problem please note this is for the renault scenic 1.9 dti 1998 reg. i had taken the casing off on top of the engine the one that covers it all for noise meaning the black cover. and looking back to the bulk head to the right hand side you can see 2 hoses which are side by side which are going into the car i dis connected both hoses and got a hose pipe and blasted them into the heater matrix with water (cold) and i dont no if this was a good idea but i got a mop bucket full of hot water reason why hot is because the engine was hot and poured it in to the tank where you top up your water just to fluss the system when it was filling i started the engine then kept pouring the water in when bucket was empty turned engine of asap re connected both hoses. on the LARGE hose you have a bleed screw i had taken that of completly then started the engine to let the water bleed through but again kept pouring water in the top up tank half a mop bucket whilst engine was running i replaced the bleed screw and hey presto the job was done i have not had any heating in the car for 4 yrs but now its hot hot hot. hope this helps to all with the scenic

Posted on Nov 06, 2009

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SOURCE: hi my escort van 52 reg heater will only get slightly hot 1800

I'm not particularly familiar with that vehicle but all that I have seen also have a valve that opens and closes to allow or restrict the fluid flow to the heater core. It could be a problem if you haven't already eliminated it. The air defecting doors under the dash that direct air to the floor or to the defroster are also suspect.

Posted on Dec 31, 2009

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SOURCE: i have a 1998 ford f-150 and no heat. i have

You just might have an air lock. Try bleeding the system from the heater hose at the firewall. Losen one hose a little, and at operating temp. open slightly to let air out. You will lose some coolant, but just refill the rad. Now, both hoses should get hot.

Posted on Jan 01, 2010

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Want a diagrame for a 2004 vw passat 1.9 tdi vacuum


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HEATER WONT WORK


Given the age of the car I'd bet the heater matrix is blocked up.
When the car is warmed up look down the back of the engine and trace 2 hoses about 1.5 in diameter heading through the bulkhead. if these are roughly the same temp. ie hot then the matrix is blocked.
Even with correct coolant 5-8 years / 80k miles is the norm for these.

depending on the particular model and facia layout this can be a mornings work for a good diy or a major task for a competent mechanic.

If the vehicle has been run for any time without the correct level of antifreeze / summer coolant then the matrix will block up.

I presume you have checked the thermostat? When the car is warm, feel the upper and lower main rad hoses. The lower should be cooler than the top. Does the heat reflect the actual engine temp? Does the gauge read low all the time? Is the thermostat stuck open and the engine temp is low?

Finally, if you think the coolant is hot enough and the small hoses are as hot, are the heater flap controls working properly?

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Damp passenger floor sounds like a heater core. What a pain in the a__. Most probably the dash has to come out to replace. That is the only thing I know of that circulates engine coolant into the passenger compartment.
If you confirm this and want to fix it on the cheap, you can put a crossover hose in the engine compartment and bypass the heater core entirely. This is a $5 fix that works perfectly, mechanically speaking. Unfortunately, you will have no heat. Of course, you may decide that is a better option once you hear a quote on getting the heater core replaced.
Oh yeah, get a new mechanic.

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you dont tell me the milage on car?as for water leaking into passanger side then the first item i would suspect is the heater matrix in behind the lower dash,start engine and see if you can spot water running in on the carpet passanger side,if so this is the problem because you are loosing water out of the main cooling system.ita not a easy job to replace but could try putting an water leak sealant into the top up on the water bowl it should seal it and stop the other problems, the car stuck in park is another problem?get a mechinac to look at this car as i suspect this is a very high milage car and needs a lot of work sorry.adrian,,,,,,,,,,,,

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you definitley have run out of coolant.thats why you have no heat.You may have a hole in your bottom radiator hose,or it may be in the radiator itself.Impossible to tell without looking at it.I suggest filling the radiator with water and take the car to your nearest reliable mechanic.Dont drive the car any further,or you will be paying for a motor replacement.

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1994 Honda Civic LX\overheating within 2 mile drive


Remove and raise upper hose at thermostat end and remove lower rad hose.
Fill rad with a hose and watch for flow from bottom rad hose and/ or bottom rad hose connecton.......water should fall though rad easily.
Honda rads are cheap.....any restriction....replace rad.

Remove thermostat....fill thermostat housing with hose and watch for water flow at bottom rad hose.
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Remove heater hoses.......flush back and forth until a good flow is present "With heater control set to hot" if no or poor flow....replace heater core.

Stop leak can plug everything.

Also.......not likely causing over heating....but ....at your mileage,if you do not know if the timing belt has been changed.....CHANGE IT NOW!
Water pump is optional at this mileage.

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1 Answer

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IT SOUNDS TO ME THERE MAY BE AIR IN THE SYSTEM STOPPING WATER CIRCULATING ROUND THE HEATER MATRIX,TRY TAKING THE CAP OFF THE RAD TOP UP BOTTLE(when cold)WITH HEATER CONTROL ON HOT ,THEN RUN ENGINE UNTILL WATER IS HOT.REPLACE CAP AND TRY HEATER.

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