An expert who has achieved level 3 by getting 1000 points
An expert that got 10 achievements.
An expert that got 5 achievements.
An expert whose answer got voted for 100 times.
Re: 1998 GMC Serria Van Heater won't blow.
Start at the relay for the heater/ac making sure it is working. Remove relay and clean it off then replace making sure there is current through to the other side.Use a test light. from there you can go to the blower motor wiring.Under your dashboard. Look for the resistor which is a switch type gadget in between the battery current and the blower. Check to see if there is current passing through to the wiring before getting to the resistor.Replace if nessesary.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
This sounds like a thermostat that is fully open all the time. It allows the engine coolant to warm when sitting still (no air being forced thru the radiator), but even that goes away when moving, since the air through the radiator will remove that heat from the coolant. Does you van have a temp gauge? Is so, at full operating temp. most vehicles have coolant temps of 180-195 degrees F, depending on the thermostat installed. Anything less indicates a thermostat that is starting to malfunction.
probably the heater core hose under the hood going to probably a broken heater core ..I bet as a mechanic and a car salesman I am 100 % correct..LOL..You will see how correct I may have been ,,Hang in there ,,it happens
I had the same problem with my Lincoln. If the heater valve fails open, it tries to heat the car. This is not the fault of the A/C. To test, when the van engine is cold, start the van and the A/C immediately. If the A/C air is cold, then your temperature control valve is stuck in the open position.