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No heat coming out on 98 Grand am GT, had coolant flushed, temp is running the same, engine is running great, bower run's find, what would i look at next ?

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Dennis,
Could be a heater core valve sticking and bypassing the heater core. You will need a diagram showing the coolant path to find the valve if it is indeed that issue. Also, if you switch the controls to defrost, does it blow hot air (after the car has warmed up to operating temperature) on the windshield? If so then your problem is with the control flaps under the dash which most likely is a vacuum to the control flap issue.

Posted on Nov 24, 2014

Testimonial: "Switch it from floor to defrost still has cold air. My son said he tapped under the pass side and heat kicked on. I didn,t have same luck."

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Posted on Jan 02, 2017

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SOURCE: ENGINE COOLANT SYSTEM NOT FUNCTIONING PROPERLY

1. Check the level you filled the coolant to...If you overfilled it this will happen. 2.  Did you add the correctly diluted antifreeze? 3. Check to be sure the radiator is unobstructed

Posted on Jun 14, 2008

  • 261 Answers

SOURCE: 98 dodge dakota slt 318. no heat, low operating temp

First thing first, turn off the engine wait for 15 - 20 mints, open the radiator cap and fill it up to the top then start the engine and see if it needs more water adn add as needed, then wait till you ca see the water circulating in the radiator now instead of corculating if it starts boiling out shut the engine replace the thermostat and do the whole thing again.

unless there is water in the engine the gauge will not be able to show the actual temp of the engine, so always malke sure you have water / antifreeze

Posted on Nov 15, 2008

emissionwiz
  • 76164 Answers

SOURCE: i want to flush the heater core

Take off the hoses at the bulkhead/firewall that go to te heater core, use a garden hose and back flush the core by forcing water through the smaller of the 2 hose nipples, if the water runs right through then you have a heater air temp control door actuator problem

Posted on Dec 24, 2008

Molson02536
  • 3854 Answers

SOURCE: replaced both sensors in a 2004 Pontiac Grand Prix P0135 P0141

A code P0135 may mean that one or more of the following has happened: = O2 Heater element resistance is high
= Internal short or open in the heater element = O2 heater circuit wiring high resistance = open or short to ground in the wire harness. 
What to do; = Repair short or open or high resistance in wiring harness or harness connectors.
= Replace oxygen sensor (cannot repair open or short that occurs internally to sensor)
A code P0141 may mean that one or more of the following has happened:

Same as above: mentioned in P0135.
What do do is the same as above, so i am leaning towards and faulty wire harness since you have replaced both O2 sensors. Make sure the wire harness has no break in it or crushed connection clips. The other thing to look for is a bad fuse that is used to heat up the O2 sensor. It may not say O2 sensor on it, it may piggy back off something else so check all the fuse and make sure the O2 has a good ground and not corroded. Good luck and hope this helps. 

Posted on Jun 25, 2009

  • 6982 Answers

SOURCE: 97 Pontiac grand am overheats as soon as it gets to running temp

If electric fans are coming on, and you have filled the system with the heater turned on high to purge it of air, even though you flushed it, I'd have the radiator flow tested (even when flushing, coolant tends to go around internal blockages, limiting its ability to work correctly) otherwise you need to begin testing from square one like you had never seen it before (don;'t assume anything you did is working) Pressure testing of coolant system, hydrocarbon test at fill opening and engine compression tests are important as well as what I mentioned above.

Posted on Jul 16, 2009

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Try the code trick, turn your ignition on and off, but not to the point that it starts 3 times- cycling the ignition key On - Off - On - Off - On- within 5 second or so you'll get some numbers on the odometer, record them and google the codes, or buy a cheap code reader....Your right around the year that doesn't work, but it can't hurt to try....

Is it blowing at all -and the way it is suppose to? Do you get it after driving awhile? Is anything leaking-even just a bit?

Check for enough coolant in the radiator(hear a gurgling?-low coolant) enough?Yes->check all hoses for cracks, splits, leaks,)all ok? Yes->-are the heater hoses hot after running a bit? yes?->flush the heater core, still nothing?-change the temp sensor..

That should keep you busy a while..

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My temp gauge goes to the third line before fans come on and only the low fan comes on. I already replaced thermostat, engine coolant temp. sensor and radiator flush... any idea why high fans dont come on...


CHECK COOLANT FAN FUSES AND RELAYS. CHECK COOLANT LEVEL.MAKE SURE ITS NOT TOO LOW BECAUSE IF COOLANT TOO LOW . BY NO COOLANT AROUND OR COOLANT SENSOR NOT SUBMERGED IN COOLANT COOLING FANS WONT TURN ON.MAKE SURE YOU HAVE 50/50 ANTIFREEZE AND WATER. CHECK FOR CLAPSE RADIATOR HOSES.CHECK RADIATOR HOSE AT WATER PUMP.IF HOSE LOOK CLAPSE REPLACE IT AND BLEED COOLANT SYSTEM.IF EVERY THING HAS BEEN DONE YOU NEED ENGINE BLOCK FLUSHED OUT.HEATER CORE ALSO COULD BE STOPPED UP.A VERY HIGH MILEAGE ENGINE WILL OVER HEAT.OLD ENGINE LOSES COMPRESSION AND HORSE POWER.PUTTING MORE LOAD ON THE OLD ENGINE WILL MAKE IT OVER HEAT.IF COOLANT LEVEL IS LOW.BLEED COOLANT SYSTEM.START THE ENGINE LET IT IDLE FEW MINUTES WATCH THE COOLANT TEMPERATURE GAUGE.WHEN TEMPERATURE START RISING.TURN OFF THE ENGINE LET IT SET FOR 20 MINUTES.TAKE A LARGE RAG PLACE OVER RADIATOR CAP ON COOLANT EXPANSION TANK SLOWLY OPEN RADIATOR CAP JUST A LITTLE TO RELEASE A LITTLE PRESSURE AT A TIME.DONT OPEN CAP RAPIDLY OR YOU WILL GET SCALDED.ONCE THE RADIATOR CAP REMOVED.IF COOLANT LOW ADD MORE COOLANT IN THE THE COOLANT EXPANSION UNTIL YOU GET TO THE COLD MARK.REPEAT THIS PROCEDURE START ENGINE LET IT RUN UNTIL TEMP GAUGE START CLIMBING A BIT DONT LET CAR RUN TO OVER HEAT JUST IDLE UNTIL TEMP JUST START TO RISE.THEN YOU TURN OFF ENGINE. WAIT 20 MINUTES.THEN USE LARGE RAG OPEN RADIATOR CAP LITTLE AT A TIME. DO THIS PROCEDURE UNTIL THE COOLANT IN THE EXPANSION TANK STOP DROPPING. THEN ALL THE AIR IS BLEED OUT THE COOLANT.WHEN COOLANT LEVEL STOP DROPPING, WHEN YOU DRIVE CAR AROUND.AND TURN OFF ENGINE.WHEN ENGINE OFF CAR SET FOR A WHILE KEEP CHECK ON THE COOLANT LEVEL IN COOLANT EXPANSION TANK. THE COOLANT LEVEL SHOULD BE AT THE COLD MARK IN THE EXPANSION TANK.MAKE SURE COOLANT IS IN THE EXPANSION TANK.IF NOT AIR WILL DRAW IN COOLANT SYSTEM. CAUSING ENGINE TO OVER HEAT.IF BLEEDING AIR OUT THE COOLANT SYSTEM DONT HELP AND COOLANT FANS DONT TURN ON YOU HAVE PCM PROBLEMS.

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1 Answer

I have no heat in my 95 4s grand am but. the ac works great.


sounds like you have a thermostat that has stuck open and is letting the engine run too cool. when car is still there is no airflow to cool off radiator and you get heat, while driving the coolant is always cooled off and no heat.

Sep 15, 2009 | 1999 Pontiac Grand Am GT

1 Answer

97 Pontiac grand am overheats as soon as it gets to running temp


If electric fans are coming on, and you have filled the system with the heater turned on high to purge it of air, even though you flushed it, I'd have the radiator flow tested (even when flushing, coolant tends to go around internal blockages, limiting its ability to work correctly) otherwise you need to begin testing from square one like you had never seen it before (don;'t assume anything you did is working) Pressure testing of coolant system, hydrocarbon test at fill opening and engine compression tests are important as well as what I mentioned above.

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Low coolant lite.


I also own a 99 grand am 3.4L
The coolant fans will not come on until the engine temp gets to about 220 degrees.

if they do not come on the relays are located under the hood in the covered panel near the LF strut tower.

also the fans should run constantly when the A/C is turned on.

good luck

Jun 25, 2008 | 1999 Pontiac Grand Am GT

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