Question about 1999 Chevrolet Cavalier

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No heat when i drive down the road my therm stat gos down all the way when i go 40 60 mph so i put a new one in in it still does it can you help me

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The heater core valve or the heater core itself may be damaged.check the hoses that run to the heater core they should be warm after running the heater full blast. if one of the hoses is hot. The valve may be plugged. the heater core valve is connected to the hose itself. It can be an electronic valve or vacuum controled valve.If it is a vacuum controlled valve you can manually open it and close it . If it's plugged by debris from dirty coolant or sludge it can get clogged. If it is an electronic valve, check it with a volt meter and see if current is flowing through it. if it is not the valve has to be replaced. if it is not the valve, it is the heater core that is leaking or has build up and has clogged.Needs to be replaced.

Posted on Nov 20, 2008


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2 Answers

No heat when driving down road

The wow list:
, 1:did this before and after stat change? .
which of 4 engines, we can not guess engines,
2: what temp stat did you buy, 180 ,195, 199F? or 160f.
3: double posted, wow 3
4: what heat, the cab heater>? Ill guess that.
5: is blower in dash blowing on high.?
6: get heat in recirc mode and fresh air, ever?
7: does cluster gauge go to hot.? like NORMAL.
8:is it -40F out side, kinda matters....ask.
9: does car have clutch fan option or electr fan.?
10: is this RAD fan working correctly?
11: did you burp out all air in the system.
12: did you get level to top of rad neck , dead cold..
13: did you put the thermostat in backwards.
14; same is jiggle pin at 12pm (up) in stat.
15: is thermostat rubber new. or old and ratty.
16: DID You scan the PCM to see some very bad DTC errors? if yes, what>?

even johnny would be GOBSMACKED.!

Have heat when sitting still,but no heat driving down road, replaced water pump and the thermostat.
heat from what?

did #21 meter show normal during all this??????????
that be KEY fact #1

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1 Answer

Why does my heat gauge go up and down while I am driving down the road

Assuming the thermostat was properly installed, you are low on coolant (dont open cap if engine is hot) or your coolant temp sensor is bad.

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Most wheel balancing machines only duplicate road speeds of 40 mph. So it could be a tire or wheel.

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1 Answer

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1 Answer

Termostat replacement

No special stuff for this. Remove anything in your way, remove therm housing, take out therm, scrape off ALL old gasket material. Put back together. (spring end of stat goes towards engine) Run and re-fill coolant with heater on high heat. check for leaks....That's it.
If you want to test old one, place in a pot of water and boil. therm should open at or close to # stamped on it (yours should be 195 use thermometer to thermometer is fine)

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1 Answer

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If we have a good thermostat. then check into the clutch fan , it sounds like your fan is on all the time

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1 Answer

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