If there is anybody that owns a late model caddy, or has worked on a caddy with a 4.9 liter v8 due to the heat not blowing hot air, please give me some advise
2006-12-03 12:35:09 · 7 answers · asked by Eugene D 1 in Cars & Transportation ➔ Car Makes ➔ GMC
i own a repair shop,and you need to first check and make sure the engine is heating up good so it can have heat,then feel of the heater hoses and see if there hot,if so check and see if the inside control unit is working fine,,this can make it not allow the heat to come on through ,and also check and see if it has a heater valve on it,and make sure that it is opening and letting the hot coolant to enter the heater core,,this will knock the heater out if its not working,,be sure the motor is heating up good ,the thermostat may be stuck open on it causing it not to heat up good,and this can cause a lot of confusion when trying to repair a heater,,good luck,i hope this help,s.
2006-12-03 17:32:03 · answer #1 · answered by dodge man 7 · 0⤊ 0⤋
Check how warm the engine is running if you have a temperature gauge in the vehicle. If it is running normal then your thermostat is probably fine. You can replace it just to be sure if it has been in the engine a long time. If everything is okay there, then check the heater control valve and the heater core. If the heater control valve isn't opening then the heater core doesn't get hot coolant going through it to heat it up. Some are controlled by vacuum. Others are controlled by electricity. If it is defective then replace it. You can check the heater core by taking off the heater hoses off at the firewall and putting a garden hose over one end and turning on the water. If water flows well then it isn't clogged.
2006-12-04 00:54:46 · answer #2 · answered by Thomas S 3 · 0⤊ 0⤋
first thing i would check is the level of anti-freeze in your radiator. the way the heater in any car works is, the hot antifreeze is forced through a sort of radiator, and as the blower fan blows air across the radiator, it heats the air, which then blows into the car. if the car is low on anti-freeze, it can't get to the heater, which eans no heat and a possible engine over-heat, as this stuff is what also keeps your engine cool. if it's low, fill it, then take it to a mechanic so he can find and fix the leak. if it's full, check your thermostat, it may be bad and need replacing. if that's ok, then check the heater ducts in your car for any cracks or holes. if this looks ok, then check the heater core (that "radiator" i told you about), if it's bad, then replace it. hope this helps!
2006-12-03 20:41:37 · answer #3 · answered by trucker_from_another_planet 1 · 0⤊ 0⤋
The guys are right about the thermostat being faulty. But i have also seen blocked heater cores ( the small rad inside the car that the fan blows across to create heat) check by putting your hand on the 1" hose going from the engine to the firewall, if its hot as hell and the other one beside it coming out is cold, your rad is blocked.
2006-12-03 20:43:56 · answer #4 · answered by frank750cc 2 · 0⤊ 0⤋
make sure the cable to flow controler is still working on the lines to the heater core might not be opening water flow to the heater core its usually located behind the glove box good luck
2006-12-03 20:45:07 · answer #5 · answered by mark m 1 · 0⤊ 0⤋
check the thermostat it may be bad, or there may not be one at all, and you need a good one for the heater to work propper. good luck.
2006-12-03 20:38:02 · answer #6 · answered by daniel h 2 · 0⤊ 0⤋
it's most likely the thermostat is stuck open.
2006-12-03 20:39:15 · answer #7 · answered by Anonymous · 0⤊ 0⤋