Question about 2003 Volkswagen Passat

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I flushed the system and had heat , let it run for over 1 hour turned it off started it up had heat . next day low heat....i did remove radiatorat first.

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The thermostat may have stuck, because of flushing system, replace thermotat if you did not do so. if a thermotat sticks closed you will not get heat. have a good day!! and be sure you bleed air from system so it will heat properly.

Posted on Nov 14, 2010

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Posted on Jan 02, 2017

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I have a 1999 Ford Taurus that would not heat, took to shop they flushed the system, replaced the water pump and it ran hot after thet flushed the system took it back they flushed the system again and


Did you have red antifreeze prior to the flushing? Ford engines are generally aluminium and should be using blue antifreeze which is suitable for aluminium engine blocks! I think the antifreeze is reacting to the aluminium.....re flush and use blue!

Dec 29, 2014 | 1999 Ford Taurus

1 Answer

Heat goes cold at stop signs


Have cooling system flushed properly which should improve circulation through heater core at idle, or low rpms. I usually flush heater core with C.L.R. (calcium, lime, rust remover) from hardware store before re-filling cooling system by removing hoses to core at firewall, and hook up to a small drill driven pump (also available at hardware store for approx$10). I use that to circulate it through core, and reverse hoses and pump it through in both directions, then let it sit in core overnight if at all possible, just for better cleaning. Drain it next day after circulating a little more, and re-fill cooling system. Be sure to leave rad cap off and heater turned on when re-filling coolant, and allow rad fan to come on and off 2 or 3 times before topping up and putting rd cap back on to be sure all air out of system. Should see improved heat at idle.

Nov 24, 2013 | Plymouth Acclaim Cars & Trucks

1 Answer

1972 chevy c10


the best suggestion is to give up on replacing compressor clutches and have the system done by an accredited ac specialist shop
excessive pressure from excessive gas is hydraulicing the compressor and making the clutch slip burning it out
next flushing the system removes all of the compressor oil in the system leaving the compressor running virtually dry
next when a system is opened , moisture laden air gets in and that has to be vacuumed out for a period of 2 hours minimum or the water in the air turns to ice and blocks the tx valve
freon gas ( if that the gas that is supposed to be used as many now run r134a) is inserted ,not by the can but by the low pressure and high pressure readings on a manifold gauge designed for that purpose
I would say that by now you would have spent more money than what it would have cost you at the ac specialist shop

Apr 22, 2017 | Cars & Trucks

1 Answer

How do you install a heater core for a1991 Mazda Navajo


remove dash assembly try to back flush first or drain cooling system put water back in add cascade dish washing soap and drive a couple days if heater starts woreking better turn heat on high run engine open drain with a hose nozel on high and a large pan under drain flush all water out with engine running refill system with heat on high and vehicle running if heat still weak remove heater hoses the top should be the return line put a hose about 8 inces long on both out lets run the bottom hose to a high area where it can be suspended put a funnel in upper hose poor clr into hose until it comes out top of lower hose let set for hour and a half then flush out with water into a clear jug flush water vthrough upper hose then if u have air compressor have a 6 inch hose attatched to upper pipe and blow out core into same jug until the jug has clean and clear water refill cooling system and drive if heat doesnt work at first put engine under a load to release residule deposits in heater core and it should start flowing

Apr 01, 2012 | Cars & Trucks

2 Answers

Heater core problems no heat changed thermostat still no heat any ideas


try flushing cooling system could be a blocked heater core.if flushing doesnt work remove and replace heatercore.

Nov 26, 2010 | 2002 Ford Taurus

1 Answer

Just flushed system installed new thermostat still no heat and still saying low coolant. no leaks anywhere also starting to miss when driving.


These can be a pain to bleed the air out of so, turn the heat on full blast, start the car and wait till it gets to operating temp.. Slowly and carefully remove the resevoir cap and fill the resevoir as needed till you get heat out of the vents. If you are able to fill the system and still no heat, flushing the system with a chemical flush is going to be necessary. This stuff can be purchased at any autoparts store for around $10 and just follow the instructions. These do work and work very well. Let me know if you need anything else.

May 07, 2010 | 1992 Chevrolet Lumina

2 Answers

Overheating-shuts off on the slightest grade


Thermostat should help but make sure fuel line isn't too close to heat source (engine or exhaust). This can perk your gas.

Jun 30, 2009 | 2000 Pontiac Grand Am GT

1 Answer

Car runs fine till it is turned off


two things come to mind....
1- a electrical component may be heat sensitive and not function after turn off heat soak
2- your fuel pump check valve isn't holding fuel pressure in the fuel loop 
Next time check for spark...if thers's spark it's a fuel problem

Mar 24, 2009 | 1997 Oldsmobile Achieva

1 Answer

No heat or defroster


Are the heater hoses warm or is just one of them warm? The reason i ask is because it looks like you've addressed everything but the heater core.It is possible that as a result of flushing the system that loose debris has clogged the passages to/of the heater core and would explain the loss of heat.
hope this helps!

Jan 15, 2009 | 1994 Plymouth Voyager

1 Answer

Low heat running & no heat at idol


I'm betting your heater core is getting plugged up. With vehicle cooled off, drain rad, and remove heater hoses going into firewall at back of engine area. Cut & connect a garden hose of proper size to one of the copper tubes coming out of the firewall. Run water through it for a while to clear it out, now connect it to other tube & do the same. Re-attach hoses, fill rad with proper coolant mix and start engine with heater (not defrost) on while you do it. Keep topping up rad as coolant goes down. Let it run for a while, and rev the engine a little every once in a while and hold it there for 20-30 seconds just to speed up the air bleed and circulation process. Leave the cap off until it reaches normal operating temperature & wait for rad fan to come on, then off 2 to 3 times to make sure all air is out of the system. Put rad cap back on & top up coolant return bottle to proper level, and check that bottle for a couple of days just in case level goes down a bit after. If you have the time when heater hoses are off, I recommend plugging one of the tubes, (bottom one) and using the hose for flushing attached to other tube, and a funnel, and filling the core with "CLR" and letting it sit in there overnight to clean out calcium build up better inside the heater core. Then drain it, flush it & re-connect next day, but that's up to you. Good Luck, let us know how it goes.

Jan 10, 2009 | 2000 Dodge Caravan

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