my heater doesnt blow hot

[bcrosby]

What would make my heater not blow hot? Now that its getting cold out ive noticed that my heater just doesnt blow hot. Could it be the thermostat? Any ideas would be appriciated.

 

[jcurcillo]

Make sure the coolant hoses are going from your engine to the firewall. They could had been removed by a previous owner. This is how the heater core gets hot coolant. Also make sure you have a proper ratio or coolant to water mixture. These heater core hoses are thin and can freeze in cold weather. Then check the dial and flapper mechanism that enables your dash dials to change from hot to cold. They are link by little metal rods. One could have come out of place or broken.

 

[dsmtalontsi95]

Could the thermastate have anything to do with this?

 

[914g63gsx]

I was thinking that the thermastat was messed up. Put a new one in an hour ago, and still nothin. I give up , i got a truck with good heat so parked it goes.

 

[germanlookk72]

what about coolant temp sensor? or is that only for the gauges.

 

[l3igl3ang]

my m8s 92 pontiac grandam had this problem the the heater core was stopped up and only got a little warm. we replaced the heater core and it got nice and tosty from then on.

my money is on your hreater core and begin u have a 91 i bet its time for a new heater core.

 

[914g63gsx]

my m8s 92 pontiac grandam had this problem the the heater core was stopped up and only got a little warm. we replaced the heater core and it got nice and tosty from then on.

my money is on your hreater core and begin u have a 91 i bet its time for a new heater core.

you could be right. Mabey over the rest of the winter i will take care of that. Thanx for all the input on this.

 

[l3igl3ang]

Heater core should only cost around 30 bucks but they can be a job to replace.

 

[digitalasylum7]

so its been getting colder and colder in N.Y.

Whem I used to start up my 97GS-T it would be tropicaly hot within 5-10 min. Now, it will blow ice cold until i start driving for a while, and, when I slow down (stop sign, red light) it will start to blow cold again!

Any ideas? Searched forums coudlnt find anything to relevant.

-Engine temp normal.
-Coolant level normal.
-NO other problems...

Googled it- Bad waterpump possible???

 

[viperlp01]

You probaly have low coolant.

 

[TALONTRAX]

Sounds like possibly a clogged heater core. I`d say failing water pump (I`ve seen that before), however the engine temp. is normal, & no coolant loss. If the only symptom is no heat at lower rpm`s, I`d say clogged heater core.

 

[nfernotalon]

Low Coolant

 

[Supa Dexta]

Your fan isnt on all the time is it? The engine would build heat driving, but quickly lose it while sitting if it were..

 

[Defiant]

Thermostat failed open.

 

[ktmrider]

Low coolant, clogged core, or air trapped in the core/lines. At idle the water pump is not pushing as much coolant, increasing RPM's gets the coolant flowing better ( low or plugged symptoms ).
"Burp" the coolant system ( with the heater temp on full Hot and in recirc ). Once full do a pressure test, maybe compare to another healthy car.

 

[-LA-]

Your fan isnt on all the time is it? The engine would build heat driving, but quickly lose it while sitting if it were..

Deff. check this.

• Coolant
• Thermostat

 

[talonz27]

i have same problem! my car never really blows warm air unless your driving then its somewhat warmer, then at a stop its ice cold air. and it doesnt blow the air very hard. let us know what it is if you get it figured out so i can fix mine also .

 

[assault187]

Im also going to say check the coolant level. A thermostat that has failed OPEN will get cooler while driving and when they fail closed overheating will most likely be issue

 

[plymubishi]

Clogged heater core or Rad.(I have seen both do the same thing)

 

[digitalasylum7]

Keep you updates, thanks for all the tips. Just moved back to school today so ill check on the weekend

 

[bane3d]

2nd the low coolant. It will do exactly that.

d

 

[digitalasylum7]

Wow, SO it turned out my coolant WAS low, even though I had checked it not much earlier. Anways, toped it off, works great. I guess the next step is finding out where all the coolant went...Probably somewhere where the missing sock from the dryer ends up I suppose...

 

[Car_guy_09]

Glad you got it fixed

 

[-LA-]

Wow, SO it turned out my coolant WAS low, even though I had checked it not much earlier. Anways, toped it off, works great. I guess the next step is finding out where all the coolant went...Probably somewhere where the missing sock from the dryer ends up I suppose...

@ the sock. Glad you find that problem. Had a feeling it was that.

Have you seen any spots under your car on the ground when you move it ?

Did you also fill your overflow bottle, if you have one.

 

[Defiant]

Look for a cracked overflow bottle.

 

[nfernotalon]

told ya check your heater hoses too mine is leaking from there as we speak actually. (ok type whatever) Sock