Question about 2000 Chevrolet Venture

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CHANGED THERMOSTAT,FLUSHED AND FILL RAD. STILL OVERHEATS AND NO HEAT. HEATER CORE?

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Hi if when you filled the coolant back up you trickled the coolant in to prevent an air lock and if you also undone all the air bleed screws that run around the top of the hoses that run around the top of the engine, if you done both of the above and you still have it over heating and not heat in the car then this sounds like bad news.

it sounds like it could be head gasket trouble.

first i would drain all the coolant and refill it very slowly and undo any bleed screws if you have any in any of the top hoses, then when the coolant level is where it should be do bleed screws up if you have them and then start the engine but leave coolant filler cap off turn the heater on hot and turn it on then let the engine reach normal running temp then put the coolant cap on.
then see if it over heats, if it does then you need to have a gasses test done to prove the head gasket is at fault.

you can buy this test yourself from car spares shops and its a bottle that fits over the coolant filler cap and it has a blue liquid inside it then you run the engine and draw the air through this liquid and if the head gasket has gone it will change the color of the liquid.

check oil for signs of white substance this would prove head gasket failure if no signs of this then you need to have the sniff test done before you do any more work to the car as you could be throwing money down the drain.

let me know how you get on or if you need further assistance ok

plz rate this solution as i have a whole page of unrated posts, thanks

Posted on Sep 10, 2010

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2 Answers

My 1997 isuzu rodeo overheats and has no heat what's wrong


Could be that the heater core is clogged... for the car to operate at optimal temperature (not to cold, not too hot) all cooking system had to be working properly, I had a '97 camaro, it had 2 previous owners and I had heater core issues and also the hose that goes to the expansion tank was clogged, causing the water to build enough pressure to escape trough radiator cap... anyways they're two totally different cars but seems to me you need a cooling system flush.

They sell a kit which includes a T fitting that goes in the hose flowing towards the heating core, and allows you to connect a garden hose to push water through the system with radiator cap off so all can circulate and clean up. Being careful (water pressure in houses is more than the system is designed to withstand, for instance a radiator cap can be 15 - 20 psi, depending on area, some homes have above 40 psi) is a great diy little project. Alternatively you can pay a mechanic shop to do it. After a flush, drain the radiator from bottom plug and refill with coolant always. Don't run your system with water and don't drive an overheating car, it will blow a gasket and that's when you kiss your car goodbye, repair is not only expensive but blown gasket might leave sequels on engine.

Feb 25, 2017 | Isuzu Cars & Trucks

1 Answer

Flushed the heater core changed thermostat, water pump is good, changed fuse, heater was throwing heat but was over heating,checked radiator(flushed and added new fluid) now back to no heat


no, not special but you failed to stated engine, there are many engines.
and some are very tricky here, like 2.0L.
First state the symptoms,
your post states its overheating, then no heat. (why?)
old post. but others might
Ill post , overheating ,
Example if me, with overheat.
I see my dash gauge, show overheating and engine power drops and pings, then steam vents from the rad, cap?
Over heating (ill skip cab heater but on 2L this path blocked causes thermostat to go quite nuts. not posting engine, makes this hard.)
1: full of 50% AF (antifreeze)
2: new thermoSTAT they age and fail fast. so get a new one.
put STAT in with the wax slug down, and jiggle bleed pin forward.
get air out of system after filling, (RTM)
start car, and....
4: then using and IR pyro gun we then check that
the thermostat housing hits 170F min. but not too hot.
run motor till top rad hose gets too hot to touch 180f is normal.
I had to drive 10 miles, to get it up to 180F.
my car has the hotter, 195 STA,T so runs at 195f. (helps cooling)
USING the pyro gun , the top and bottom of each rad tube.
This tool is Amazing.... and saves burn hands.
if the bottom of any RAD tube is way less than the others?, that is
a clogged UP rad tube. solution is , NEW RAD.
Usually rad repairs, are more costly than new. IN USA.
The water pump must spin at full speed, belt tight.
The impeller or some suz, motors likes disappear. from electrolysis action. so not looking at the impeller is a FAILURE on the mechanic side.
if this car has 2.0 I-4 (4 banger) it has a coolant tube on the rear
of the STAT housing, this tube must flow coolant at all times.
if it dont, the thermostat , will go nuts.
nuts means, that insufficient flow passes the thermostat wax block
causing the thermostat to cycle in a wild and random way.
I dont like this design but is reality. If applicable.
post country, post engine type and state the symptoms.

Feb 16, 2013 | 2003 Suzuki Vitara

2 Answers

WILL A BLOWN HEATER CORE CAUSE A CAR TO OVERHEAT


No a heater core alone will not cause a vehicle to overheat. The heater cores sole purpose is to transfer heat generated by the engine to the blower motor so that you can get heat from your car vents. A person could technically remove the heater core from the vehicle and connect the hoses together to bypass it, and the car will run as if nothing happened, minus the lack of heat in the vents.

If the car is overheating, there are three mai issues that could be happening. 1) The radiator is blocked and not allowing coolant to be cooled off before returning to the engine.
2) The water pump is broken. The engine relies on this pump to move the coolant throughout the engine. It may not leak as long as the gasket is alright but the impeller ( small fans on the inside of the water pump ) could not be turning.
3) Lastly and most commonly is a faulty Thermostat. The thermostat is the valve which opens and closes at certain tempuratures and decides if hot coolant stays in the engine or circulates to the radiator to be cooled off. If the thermostat fails, unless you have a failsafe one, will fail in the closed position keeping the hot coolant in the engine and causing it to overheat.

The thermostat is by far the cheapest of the issues so consider changing that first along with a coolant flush before considering putting a new rad or waterpump. You can usually get a thermostat, 2 jugs of coolant and a flush kit for about 50$ at pretty much any parts store. Becareful however not to drive a overheating vehicle as gasket burning and head warpage can occur, which will require rebuilding th head.

Good Luck

Jul 14, 2012 | 2000 Dodge Neon

2 Answers

Changed thermostat and added coolant but 1997


could be waterpump?
i was going to say rad fan,but if so heater would be hot.
lack of coolant will make heater core to blow cold,if engine heats up with full coolant,usually means poor or no circulation.
water pump?
run engine with full coolant,at operating temp.with rad cap off and look in rad cap hole and see if there is movement of water inside rad.
[rad fan will not come on if water is not circulating through rad water pump?]

Dec 20, 2009 | 1997 Chrysler Cirrus

2 Answers

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.
Flush good.

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.

Aug 23, 2009 | 1998 Honda Civic

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

1 Answer

Heat comes and goes


This is a common problem with the Taurus. You have an air lock in the system. You need drain the rad and open the cooling system at the highest point. This is usually the upper hose on the heater core.Fill the rad very slowly until the coolant comes out of the upper hose connection. Once done run the car with the hose reconnected and the rad cap off.Put a container under the rad filler.Run the car until it comes up to temp.Slowing top off the rad with the car still running. This should do it.

Nov 29, 2008 | 1998 Ford Taurus

3 Answers

Heating / Cooling System Malfunction


all mazda 929 have this problem when the coolant level is dropped
the heater core has no fluid in it since it ts off of the engine block . hence it cannot recive any coolant to heat the car. the best way to fix this is bleed the system of air . when filling coolant squezze the return hose with the cap on the rad it will force fluid bact to the core and push the air out
once you do this a few times you will see the rad fluid droped fill it up and run the car . this should solve this problem

May 15, 2008 | 1994 Mazda 929

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