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98 chevy malibu.. blows but no heat.. flushed radiator, changed thermostat, fan relay switch, overheating in summer, now no heat in cold... how to check between heater core and water pump?

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: Eagle Vision overheating

look for bleeder screw on thermostat housing or front middle of intake manifold area.open bleeder while vehicle running bleed air out.

Posted on Jul 27, 2008

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  • 147 Answers

SOURCE: 1999 Chevy Venture continuosly overheating

sounds like u might have a blown head gasket is your oil milky colored

Posted on Nov 17, 2008

onyeredson
  • 404 Answers

SOURCE: The heat in my 1992 Jeep Wangler is not working.

Hi!
It appears we have an Air lock scenario and you will need to perform a system Bleed.
Park the vehicle on level ground, when cold remove coolant filler cap, start engine and leave to idle, turn heater on full and blower to max. When engine reaches operating temperature watch and listen near coolant filler, keep clear as gurgling and hopefully a boil over should occur. Top up with very warm coolant and wait as it may do it again.
Check for heat inside vehicle if warm replace coolant cap but keep an eye on temperature gauge as the ~Air lock may have moved on from heater matrix/core so proceedure needs to be carried out again from COLD.
If persistent boil ups/over attention must made in the cylinder head
or gasket area, or possibly water pump?
Please press the Blue button to appraise my FREE Efforts, Thank You!
Paul 'W' U.K.

Posted on Feb 05, 2009

  • 400 Answers

SOURCE: where is the thermostat in a 98 chevy malibu 2.4L?

No it not at that housing, Its under the car kinda. If you remove the heat sheild for the exhaust manifold you will be able to see the top of the housing. It connects to the bottom of the water pump housing then to a metal pipe that goes under the oil pan to the lower radiator hose. You will be able to remove the two 8mm headed bolts from the top, then unbolt the stud that holding the metal pipe under the oil pan and then you can get to the t-stat. Lots of work in tight spaces but it is possible to do with out pulling the exhaust manifold or the water pump housing!

Posted on Oct 26, 2009

wracefans24
  • 1985 Answers

SOURCE: 98 sable -no heat. changed thermostat, new

Since your blower is working and it is a heat issue,thats where we'll start,First thing is have you checked the coolant level in the radiator when engine is cold,make sure it is filled to top,next verify you have coolant in reserve ,Start your van and get it up to normal operation temperature,If your heat gauge on the dash works correctly it should be 190 degrees,Now lift the hood and locate the two heater hoses going into the heater assembly at the fire wall,Both hoses should be hot to hold on to,if both are hot and no heat inside your problem will be the blend air door in heater assembly.
if neither hose is that hot you need to replace the thermostat in the engine to get it up to 195 degrees.
if one hose is hot and one is luke warm then the heater core is blocked and to blame. hope this helps you.

Posted on Jan 02, 2010

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Does anybody have a video link on how to flush the cooling system on a GM 3.1L SFI OHV 6cyl motor? I need a vid for this particular motor cause mine is still overheating & i have looked everywhere.


flushing a cooling system is the same method as any other motor

do it without the thermostat fitted
or water pump opening

sacrifice an old radiator hose to adapt a garden hose fitting
for radiator flush

air in system fix
your thermostat housing has no air bleed valve
no top radiator cap

old school way
heater on full
run motor till thermostats fully open
burp radiator hoses
wait till water is running up into over flow bottle without bubble
replace cap
turn off heater
correct level in over flow bottle

why still over heating
you fitted everything i would have ... yet still overheat
possibles
leaking inlet manifold gaskets
hose clamps loose
cooling fans spinning too slow
thermostatic fan switch faulty
aluminum radiator is a big one
air ..fins bent or some water channels blocked

or possible head gasket leak




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Nov 02, 2016 | Cars & Trucks

2 Answers

My truck is running cold on the freeway but when I slow down and stop it starts to heat up a little. I changed the thermostat and am going to change the heater core could it be something else


yes could be problem with the radiator fan(s) not running at any road speed. Check the fan(s) for noise-free turning by hand. Check fan fuse and relay (swap with similar relay). Turn on the air conditioner which should immediately turn on the fan(s). Overheating while driving could very well be the thermostat--you will need to drain the cooling system before replacing the unit. Blow out the radiator core with compressed air from the engine side to remove bugs and other debris first. Hope this helps!

Jan 22, 2011 | 1991 Ford Ranger Supercab

3 Answers

Just flushed rad heater core and block because i had no heat. flushed the system filled with new antifreeze. my temp gauge will change from 150 to 210 I have heat then i dont


Replace the thermostat. I have had bad luck with aftermarket thermostats on this particular year of GM/ Chevy trucks.They tend to stick closed and then fully open, thus causing the temp to sort of surge hot and cold. A good thermostat will slowly open maintaning a good consistant temp. I would recommend spending a little more and getting a GM thermostat.


Please take a moment and rate my answer..........Thanks

Dec 01, 2010 | 1996 GMC Jimmy

1 Answer

Engine light comes on and says engine overheating


Could be three things: Hopefully the first...
1. radiator fan not blowing. (most likely)
2. Radiator clogged (not likely)
3. Head gasket blown... (very possible)

If #1, system cannot detect fan not blowing. It may be the fuse or the relay switch, disconnecetd wire at fan, or burned-out fan motor.
If #2, Flush radiator
If #3, you will see WHITE smoke out the tailpipe and excessive water drops.
Your new oil will have a "milky" look (check the oil dipstick). That is water.
When engine is COLD, remove radiator cap and start car. You will notice high-pressure "bubbles" squirt out of the radiator, even before the engine warms up.

I hope it is #1. and that this is helpful.



Sep 08, 2009 | 2006 Chevrolet Impala

1 Answer

Check engine light is on and the temperature gauge stop working at the same time. could the problem be the thermostat or is it a fuse? my cooling fans are running differently after the problem occured,...


First, make sure that the temp sensor is plugged in and working. If not change it. If problem persists, check fan relay and sensor. It is doubtful that the problem is the thermostat because if open the fans would never come on (running too cold) and if stuck closed you wouldn't have to wonder if it was overheating... (would be blowing antifreeze out everywhere)

Feb 16, 2009 | 2001 Chevrolet Malibu

6 Answers

Pontiac sunfire overheating


I have your fix, Disconnect your Heater Core hoses and flush out the Heater Core or replace it. The coolant has to pass through the Heater Core before it gets to the Thermostat. GM designed the cooling system this way to speed up in-cab heating.

Jan 03, 2009 | 1998 Pontiac Sunfire

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