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I just changed the heater control valve and now my temp gage is always on high. Filled coolant to top and now it's almost gone. Don't see any leaks. Also heater and ac doesnt seem to work. only one temp flows out. What could be wrong?

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  • 84 Answers

Check radiator, the fluid went somewhere.

Posted on Jul 10, 2013

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Posted on Jan 02, 2017

  • 83 Answers

SOURCE: location of heater control valve 2005 grand prix

i don`t think there is a heater control valve.you may have an air pocket in system.

Posted on Jan 06, 2009

  • 36 Answers

SOURCE: Can't change air flow direction on ac/heater control. Only blows up to windshield.

It will be a cable that will be disconnected. or broken. Youll have to take some of the dash apart to see the cable and follow it to the switch. Dont be affraid to take some things apart and when you cant see, use a mirror to help you see behind the dash. work the control and watch the action. You will fix this dont get frustrated. good luck

Posted on May 22, 2009

  • 1 Answer

SOURCE: 1999 Olds Bravada - High Heat is always on.

I have narrowed the problem to a non-functioning climate control acctuator (a mechanical vent door opening/closing unit that mixes warm and cold air) Unfortunately it is located high in the dash and requires entire removal of dash panel. Shop repair manual states a repair time of 5.2 hours... GM parts $260 actuator $75 door panel......Online parts $60 to $175

Posted on Jul 08, 2009

  • 2 Answers

SOURCE: 2002 Dodge Intrepid has no heat

Radiators do not "go out". They leak or they don't... that's it. You wasted money changing a radiator if you aren't loosing coolant. The thermostat (~$10) is all you needed to change.

Posted on Dec 12, 2009

  • 1212 Answers

SOURCE: Coolant Boiling over but engine temp. is fine??

The engine thermostat may be sticking closed. However the temp gauge itself or temp sending unit or wiring is defective, start with the sending unit as it is cheapest part to replace and follow the wiring into the harness and the harness itself up to the firewall. If the gas gauge is reading accurately, the dash regulator should be okay.

It is possible the electric fan thermostatic switch may not be operational, or relay intermittent/defective, or even the retrofit wiring may be questionable. You would need to run it so it fully warms up and thermostat opens.

If it was a retrofit to a "Sable" 70 Amp cooling fan, is your alternator up to the challenge?

The way to simply check for a head gasket issue is with engine cold, if you remove the cap where you fill directly into the cooling system of the engine, not the reservoir, start the engine. If you get a geyser out of the opening, you blew a head gasket or cracked a head. If you let it warm up a little bit, but not to the point where the thermostat opens, it will reveal if there is head gasket issue to be looked into. Doing this allows for the parts to begin to expand and a sealed spot cold might leak at 110 degrees F. You might also see a white cloud behind the car.

Posted on Dec 20, 2011

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2 Answers

I changed the thermostat but it still does not heat up what else could be wrong


Heater needs Heater Core, Heater control valve, air diverter inside the car and hot water in the heater core. If you just change the thermostat you must have had a reason. If the car was running hot it could be a radiator clog. If the core is clogged no heat. If the heater core was drained when you changed the Tstat there may be air in it - if so no heat. If the control valve (on the heater hose) does not shift- no heat. If the diverter door in under the dash does not direct the fan air through the heater core- no heat.

Jan 03, 2016 | Cars & Trucks

1 Answer

1998 Toyota Camry 4 cyl.only blows warm air from heater when car is unning for say ten min. When I start driving the temp gage goes down to cold and blows cool air, no heat. I changed thermostat and...


Your radiator cooling fan will only come on when the engine temp has reached the point where it needs to have air forced through the radiator and thus bring engine heat back down to safe operating range. If your heater is not working check to make sure the fresh air vents aren't stuck open (are the controls stiff or not going all the way across?) check also that the heater shutoff valve lever which is usually situated on the firewall at the rear of the engine and can be found easily by tracing the hoses back from the thermostat housing aren't bent and/or seized up.

Apr 08, 2017 | 2000 Toyota Camry

1 Answer

Location of coolant drain plug on side of motor for a 1995 mitsubishi montero


Not exactly,need to bleed air from system look topside of engine area for a bleeder port may need a filler reservoir full of coolant when doing this keep it full turn on heater full hot fan on high watch temp gauge if it gets hotter than normal reading and no hot air from heater ducts turn engine off ASAP it can be a pain in the grommet to bleed cooling systems but if you don't engine damage is imminent got to get air out of system drain plug on block does not sound right maybe it's on the top of block I have pulled hoses and filled system thru those and even used garden hose to force air out squeeze hoses rock vehicle and make big messes but don't overheat the engine from complete cool engine you have about ten minutes to get r done then let it cool down try again

Apr 02, 2012 | Cars & Trucks

2 Answers

2003 impala temp. gage goes high & low and no heat comes out of heater. it continues to cycle like this as I drive. When temp. gage goes up the heater quites.


Have u checked the coolant level? this type of problem useualy indicates the coolant is low, if it is low you need to have the engine cooling system tested for a leak, the coolant goes out somewhere.

Jan 29, 2010 | 2003 Chevrolet Impala

3 Answers

Would the heater control valve malfunctioning make the engine overheat blowing hot air out the heater one moment,then not blowing the hot air, temp gage spikes 225 plus. The motor takes awhile to heat up...


Heater control valve malfunction will not cause engine to overheat unless coolant is leaking externally...Overheating going down the road can be the result of a few different things...Partly clogged radiator...Insufficient air flow due to possible fan problem...External coolant leak...Make sure fans are operting properly and have cooling system pressure tested for leaks...Gaining and losing heat on the inside of the vehicle usually means system is low on coolant but you must find out where coolant is going

Jan 06, 2010 | 2004 Chevrolet Impala

1 Answer

Warm heat not hot


Check antifreeze level, if it is low coolant may not flow through heater core. If coolant level is ok feel the heater hose with engine running at normal operating temp and heat on high, if one hose is much cooler than the other you have a bad heat control valve or a pluged heater core.

Oct 15, 2009 | Pontiac Grand Am Cars & Trucks

1 Answer

My 1995 chevy van blows out cold air when i have the heat on


The hoses to the heater core may have been re-plumbed to by-pass the heater core (a temporary fix to a leaking heater core)...so verify that hoses are routed properly. If they are, check coolant fluid level....when it is gone...the heater will not blow hot, and you will likely burn up the engine (if coolant is gone...temp gage may not register "hot" because there is not fluid for the temp sensor to measure. Also...you may have a broken/cracked vacuum line (the valves for switching where the air gets directed are typically vacuum controlled) Hope this helps.

Oct 12, 2009 | Chevrolet Astro Cars & Trucks

2 Answers

1996 crown victoria has no heat


the temp blend door may not be rotating from the a/c evaporator to the heater core opening.

Could be the motor on the blend door or the temp control knob.

Do you have manual a/c or electronic temp control?

If it's the a/c door electronic actuator motor, it's on top of the plenum. Have to remove the instrument panel for access.

Hope it's the temp knob on the control head.

top one is the circuit you are looking at
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Apr 23, 2009 | 1996 Ford Crown Victoria

1 Answer

Sudden overheat


hi  ernie try changing the thermostate first as this can cause this  D

Jan 03, 2009 | 2001 Jaguar S-Type

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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