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MY HEATER THERMOSTAT STUCK @ 126F MY CLEANING PUMP IS RUNNING NO WATER GOING TO THE FILTER

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2 problems. 1st problem is a bad temp sensor.

Posted on Aug 30, 2009

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Posted on Jan 02, 2017

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HEATING ISSUES


One way to tell a bad thermostat in a car is if the car overheats frequently even if there is water in the radiator.Stuck open - no heat from heater, temp gauge hardly moves off of cold.
Stuck closed - overheats engine, temp gauge quickly climbs to hot.listen for any rubbing, grinding, or whining noises from the pump. look under water pump while running, if pump is going bad. water will come out of weep hole on the bottom of the pump. good-day!

Apr 07, 2014 | 2005 Kia Sorento

1 Answer

I noticed overheating, no warm air when heat was turn on. ? is the t-stat stuck close or water pump gone? checked hoses in and out of the heater core from under the hood and they were not hot nor felt like...


Well if the thermostat was stuck closed, the engine and the heater would get hot but the coolant would not flow thru the radiator.
If the cooling system is full of fluid, and the engine is running hot, and the heater hoses are cold, I would say the water pump has failed or you have another kind of restriction.

Jan 04, 2013 | 1995 GMC Jimmy

1 Answer

03 civic heat doesn't work unless driving


no that is a water pump or a stuck thermostat. see when you are driving the coolant is going through the system which means the faster you go the faster the water pump goes and more pressure on the thermostat. you have a stuck thermostat

Dec 14, 2012 | 2003 Honda Civic

1 Answer

Hayward heater H 150,Code LO


"LO" is simply informing you that the Heater is not sensing proper water flow through it! A Flow Problem.
A special sensor, called a pressure switch is this source. But... That does not mean it is bad - No, it is in most cases just doing its job!
Most common reason - Dirty Filter.
A good cleaning of the cartridges, or maybe a breakdown and recharge of a DE Filter, or a good cleansing backwash of your sand filter, will remedy this situation.
Or... Check for any OTHER reason or situations water flow may be reduced through the heater:
  • enough water in pool or spa?
  • If you have a weir gate in skimmer, is it stuck in the UP position?
  • Are any valves closed?
  • Do you have a bypass valve at the heater?
    • If open, this will reduce the amount of water going thru heater, close it to the point, LO goes away.
  • Could be debris in front of Pressure Switch, in the copper tubing
    • Unscrew and remove pressure switch, turn pump on. But first, align end of tube so that when water squirts out it will shoot out from heater and not onto electronic heater components!
  • If all above is good, you may have failed pressure switch?
  • Etc
Good Luck - hope this helped.

May 25, 2012 | Hayward H-series Electronic Gas Pool...

1 Answer

02 isuzu overheated


check your coolant level. Check to make sure your cooling fan is running, Thermostat could be an issue also. Also check water pump. To check thermostat feel top radiator hose when vehicle heats up if it gets hot your thermostat is probably working if it does not then ur thermostat is probably stuck closed and needs to be changed. If your water pump is leaking out the weep hole (small hole at neck of water pump) then you will need to change the pump because it is going or has gone out.

Dec 24, 2011 | 2002 Isuzu Rodeo

1 Answer

Temp gt hot blowing cold air would this be a thermostat or water pump


Maybe a thermostat..or the heatercore clogged up..If the vehicle runs hot pretty quick then its the thermostat stuck closed..If the vehicle is not running hot,but you have no heat then the thermostat will be stuck open or the heater core not circulating

Sep 04, 2011 | 2000 Buick Century

1 Answer

My exe's 98 blazer overheated on the way home last week, replaced thermostat on the side of the road, no help. She took it to a repair shop they told her they did a CO check of the coolant and she had a...


Assuming the following;
The head gaskets were replaced properly
The Water Pump was replaced properly
The Thermostat was replaced properly

There are only a few other things to check.
1) if you you remove one of the heater hoses from the engine bib during a cold filling from the radiator - it will release trapped air until you see the coolant coming out the motor side - this works great to ensure the air is out. Hook hose back up before running.(or you could leave the hose off for a second and start it to see if water gushes out - water pump check - kinda messy though)

Remember that heater water will circulate even with the thermostat is closed.

if that does not work, then you need to ensure the top hose going to the radiator warms up indicating the thermostat is opening and hot engine water is starting to dump into the radiator.

2) the radiator more than likely is clogged and needs cleaning by a radiator shop, or replacement if it is not one that can be cleaned.

Ask your son if he remembers looking into the water ports where he took off the old water pump, sometimes of the system is not flushed at proper intervals, it will sludge up the water jackets and keep water from circulating through the motor.

one last thing (gulp) That CO check is pretty accurate - and cheap. You might want to have it checked again - because the heads should have been inspected for cracks as well as pressure checked before putting them back on - especially since the motor overheated. That alone will crack the heads beyond repair - more so than not.

Let me know if you have any other questions.

Good Luck.

Oct 03, 2010 | Chevrolet Blazer Cars & Trucks

2 Answers

2001 Jeep Cold RAdiator


Does your temp gauge read normal? if it does then the thremostat is ok,but sadly the water pump is going bad this is typical of jeeps at an idle the heater cools off because the water pump fins are worn enough to not circulate through the heater core and when you step on the gas the increased rpm move the water fast enough to circulate through the heater,it is possible that the heater core is plugged but I doubt it as a plugged heater core would not get hot either it would be cold or just luke warm all the time.

Dec 25, 2008 | 2001 Jeep Grand Cherokee

1 Answer

Defrost will not come out vents


Check your coolant level first. Next check your heater control valve. With engine at operating temp and heater on high, do this:

1. Heater hose from water pump should be hot (if not, water pump may be dead or thermostat is stuck closed)
2. Heater hose from thermostat housing should be hot (if not, thermostat may be stuck closed or water pump is dead)
3. Heater hose going to heater core should be hot ( if not, heater control valve is not getting vacuum from heater control unit, or valve is broken)
4. Heater hose returning from heater core should be hot (if not, heater core is blocked, undo both hoses to core and flush with water hose until clear)

Test thermostat: with cold engine cranked, watch water temp gauge. As it gets hotter and hotter, when the thermostat opens, the temp should drop suddenly and then go back up.

Test water pump: with engine at operating temp. Squeeze top radiator hose tight, when you release it, you should feel/hear a surge of water. It is much like when you pinch a water hose closed and release it.

Test vacuum from heater control unit to heater control valve: undue vacuum line from control valve. It should have a vacuum when pressed against you skin in addition to releasing the actuating arm on the control valve.

If there is no vacuum, a quick fix will be to disconnect the plastic actuator from the silver arm on the heater valve. This will let the hot water to always flow to your heater core.

Dec 17, 2008 | Jeep Cherokee Cars & Trucks

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